Ethylene oxide catalyst and process for preparing the catalyst
First Claim
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1. An ethylene oxide catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen comprising a catalytically effective amount of silver, a promoting amount of alkali metal and a promoting amount of rhenium supported on a suitable support having a surface area ranging from about 0.05 to about 10 m2 /g. reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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Abstract
This invention relates to an ethylene oxide catalyst having an improved selectivity which catalyst comprises silver, a promoting amount of alkali metal and a promoting amount of rhenium supported on a porous refractory support.
248 Citations
122 Claims
- 1. An ethylene oxide catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen comprising a catalytically effective amount of silver, a promoting amount of alkali metal and a promoting amount of rhenium supported on a suitable support having a surface area ranging from about 0.05 to about 10 m2 /g. reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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2. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, alkali metal promoter and from about 0.2 to about 5 millimoles of rhenium promoter, measured as the metal, per kilogram of total catalyst, supported on a porous, refractory support;
- the combination of silver, alkali metal promoter, rhenium promoter and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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3. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, alkali metal promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst supported on a porous, refractory support wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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4. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, alkali metal promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide, supported on a porous, refractory support;
- the combination of silver, alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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5. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, alkali metal promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide supported on a porous, refractory support wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
- 17. An ethylene oxide catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen comprising a catalytically effective amount of silver, a promoting amount of a higher alkali metal comprising potassium, rubidium, cesium, or mixtures thereof and a promoting amount of rhenium supported on a suitable support having a surface area ranging from about 0.05 to about 10 m2 /g.
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18. An ethylene oxide catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen comprising a catalytically effective amount of silver, a promoting amount of a higher alkali metal selected from the group consisting of potassium, rubidium, cesium and mixtures thereof and a promoting amount of rhenium supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g.
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19. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, a higher alkali metal promoter comprising potassium, rubidium, cesium or mixtures thereof and from about 0.2 to about 5 millimoles of rhenium promoter measured as the metal, per kilogram of total catalyst supported on a porous, refractory support;
- the combination of silver, higher alkali metal promoter, rhenium promoter and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
- View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49)
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20. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, a higher alkali metal promoter comprising potassium, rubidium, cesium or mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst supported on a porous, refractory support wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, higher alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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21. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, a higher alkali metal promoter comprising potassium, rubidium, cesium or mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide, supported on a porous, refractory support;
- the combination of silver, higher alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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22. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, a higher alkali metal promoter comprising potassium, rubidium, cesium or mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide, supported on a porous, refractory support wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, higher alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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23. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising from about 1 to about 25 percent by weight of total catalyst of silver, from about 50 to about 1000 parts by weight, measured as the metal, per million parts by weight of total catalyst of a higher alkali metal promoter selected from potassium, rubidium, cesium and mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst supported on a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.1 to about 3 m2 /g and a water pore volume ranging from about 0.25 to about 0.55 cc/gm;
- the combination of silver, higher alkali metal, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
- View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57)
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24. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising from about 1 to about 25 percent by weight of total catalyst of silver, from about 50 to about 1000 parts by weight, measured as the metal, per million parts by weight of total catalyst of a higher alkali metal promoter selected from potassium, rubidium, cesium and mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst supported on a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.1 to about 3 m2 /g and a water pore volume ranging from about 0.25 to about 0.55 cc/gm wherein the rhenium is applied to support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, higher alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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25. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising from about 1 to about 25 percent by weight of total catalyst of silver, from about 50 to about 1000 parts by weight, measured as the metal, per million parts by weight of total catalyst of a higher alkali metal promoter selected from potassium, rubidium, cesium and mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide supported on a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.1 to about 3 m2 /g and a water pore volume ranging from about 0.25 to about 0.55 cc/gm;
- the combination of silver, higher alkali metal, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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26. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising from about 1 to about 25 percent by weight of total catalyst of silver, from about 50 to about 1000 parts by weight, measured as the metal, per million parts by weight of total catalyst of a higher alkali metal promoter selected from potassium, rubidium, cesium and mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide supported on a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.1 to about 3 m2 /g and a water pore volume ranging from about 0.25 to about 0.55 cc/gm wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, higher alkali metal, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
- 58. An ethylene oxide catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen comprising a catalytically effective amount of silver, a promoting amount of cesium and a promoting amount of rhenium on a porous refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g.
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59. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising from about 1 to about 25 percent by weight of total catalyst of silver, from about 50 to about 1000 parts by weight, measured as the metal, per million parts by weight of total catalyst of cesium promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst supported on a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.1 to about 3 m2 /g and a water pore volume ranging from about 0.25 to about 0.55 cc/gm;
- the combination of silver, cesium promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and cesium.
- View Dependent Claims (68)
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60. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising from about 1 to about 25 percent by weight of total catalyst of silver, from about 50 to about 1000 parts by weight, measured as the metal, per million parts by weight of total catalyst of cesium promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst supported on a porous refractory support comprising alpha alumina having a surface area ranging from about 0.1 to about 3 m2 /g and a water pore volume ranging from about 0.25 to about 0.55 cc/g wherein the rhenium is applied to the support as rhenium heptoxide or ammonium or alkali metal perrhenate or mixtures thereof;
- the combination of silver, cesium promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and cesium.
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61. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising from about 1 to about 25 percent by weight of total catalyst of silver, from about 50 to about 1000 parts by weight, measured as the metal, per million parts by weight of total catalyst of cesium promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide supported on a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.1 to about 3 m2 /g and a water pore volume ranging from about 0.25 to about 0.55 cc/gm;
- the combination of silver, cesium promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and cesium.
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62. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising from about 1 to about 25 percent by weight of total catalyst of silver, from about 50 to about 1000 parts by weight, measured as the metal, per million parts by weight of total catalyst of cesium promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide supported on a porous refractory support comprising alpha alumina having a surface area ranging from about 0.1 to about 3 m2 /g and a water pore volume ranging from about 0.25 to about 0.55 cc/g wherein the rhenium is applied to the support as rhenium heptoxide or ammonium or alkali metal perrhenate or mixtures thereof;
- the combination of silver, cesium promoter, rhenium and support affording a higher initial selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and cesium.
- 73. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous refractory support having a surface area ranging from about 0.05 to about 10 m2 /g with a catalytically effective amount of silver, a promoting amount of alkali metal and a promoting amount of rhenium.
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74. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen which comprises impregnating a porous refractory support with one or more solutions comprising silver, alkali metal and/or rhenium wherein the concentration of the silver (measured as the metal) in the solution ranges from about 1 g/l to the solubility limit of silver in the solution, the concentration of alkali metal (measured as the metal) in the solution ranges from about 1×
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
10-3 g/l to about 20 g/l to provide the catalyst with a catalytically effective amount of silver, a promoting amount of alkali metal and a promoting amount of rhenium. - View Dependent Claims (94, 95, 96, 97)
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
- 75. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which comprises impregnating a porous refractory support with one or more solutions comprising solvent having silver compound(s) dissolved therein, and/or alkali metal compound(s) dissolved therein and/or rhenium-containing compound(s) dissolved therein sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver compound(s), measured as the metal, from about 20 to about 1500 ppm by weight of alkali metal compound(s), measured as the metal and from about 0.2 to about 5 millimoles per kilogram of total catalyst, measured as the metal, of rhenium-containing compound(s) to provide the catalyst with a catalytically effective amount of silver, a promoting amount of alkali metal and a promoting amount of rhenium.
- 76. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support with one or more solutions comprising silver ions, alkali metal ions, rhenium-containing ions or mixtures thereof sufficient to deposit on the carrier from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of alkali metal compound(s), and from about 0.2 to about 5 millimoles of rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, alkali metal promoter, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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77. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support with one or more solutions comprising silver ions, alkali metal ions, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of alkali metal compound(s), and from about 0.2 to about 5 millimoles of rhenium compound(s), measured as the metal, per kilogram of total catalyst, said rhenium compound(s) providing in the final catalyst rhenium in a form which is extractable in a dilute (20 millimolar) aqueous sodium hydroxide solution;
- and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, alkali metal promoter, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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78. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with a catalytically effective amount of silver, a promoting amount of higher alkali metal comprising potassium, rubidium, cesium or mixtures thereof and a promoting amount of rhenium.
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79. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen which comprises impregnating a porous refractory support comprising alpha alumina with one or more solutions comprising silver, and/or higher alkali metal selected from the group consisting of potassium, rubidium, cesium and mixtures thereof, and/or rhenium wherein the concentration of the silver (measured as the metal) in the solution ranges from about 1 g/l to the solubility limit of silver in the solution, the concentration of alkali metal (measured as the metal) in the solution ranges from about 1×
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
10-3 g/l to about 20 g/l to provide the catalyst with a catalytically effective amount of silver, a promoting amount of higher alkali metal and a promoting amount of rhenium.
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
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80. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which comprises impregnating a porous refractory support comprising alpha alumina with one or more solutions comprising solvent having silver compound(s) dissolved therein, and/or higher alkali metal compound(s) selected from compound(s) of potassium, rubidium, cesium and mixtures thereof dissolved therein and/or rhenium-containing compound(s) dissolved therein sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver compound(s), measured as the metal, from about 20 to about 1500 ppm by weight of higher alkali metal compound(s), measured as the metal, and from about 0.2 to about 5 millimoles per kilogram of total catalyst of rhenium-containing compound(s), measured as the metal, to provide a catalyst with a catalytically effective amount of silver, a promoting amount of higher alkali metal and a promoting amount of rhenium.
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81. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support comprising alpha alumina with one or more solutions comprising silver ions, higher alkali metal ions selected from the group consisting of ions of potassium, rubidium, cesium and mixtures thereof, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of higher alkali metal compound(s) selected from compound(s) of potassium, rubidium, cesium and mixtures thereof, and from about 0.2 to about 5 millimoles of rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, higher alkali metal promoter, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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82. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support comprising alpha alumina with one or more solutions comprising silver ions, higher alkali metal ions selected from the group consisting of ions of potassium, rubidium, cesium and mixtures thereof, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of higher alkali metal compound(s) selected from compound(s) of potassium, rubidium, cesium and mixtures thereof, and from about 0.2 to about 5 millimoles of a rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, said rhenium-containing compound(s) providing in the final catalyst rhenium in a form which is extractable in a dilute (20 millimolar) aqueous sodium hydroxide solution;
- and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, higher alkali metal, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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83. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with a catalytically effective amount of silver, a promoting amount of cesium and a promoting amount of rhenium.
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84. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which comprises impregnating a porous refractory support comprising alpha alumina with one or more solutions comprising silver, and/or cesium and/or rhenium wherein the concentration of the silver (measured as the metal) in the solution ranges from about 1 g/l to the solubility limit of silver in the solution, the concentration of cesium (measured as the metal) in the solution ranges from about 1×
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
10-3 g/l to about 20 g/l to provide the catalyst with a catalytically effective amount of silver, a promoting amount of cesium and a promoting amount of rhenium.
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
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85. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which comprises impregnating a porous refractory support comprising alpha alumina with one or more solutions comprising solvent having silver compound(s) dissolved therein, and/or cesium compound(s) dissolved therein and/or rhenium-containing compound(s) dissolved therein sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver compound(s), measured as the metal, from about 20 to about 1500 ppm by weight of cesium compound(s) measured as the metal, and from about 0.2 to about 5 millimoles per kilogram of total catalyst of rhenium-containing compound(s), measured as the metal, to provide the catalyst with a catalytically effective amount of silver, a promoting amount of cesium and a promoting amount of rhenium.
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86. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support comprising alpha alumina with one or more solutions comprising silver ions, cesium ions, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of cesium and from about 0.2 to about 5 millimoles of rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, cesium, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and cesium.
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87. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support comprising alpha alumina with one or more solutions comprising silver ions, cesium ions, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of cesium compound(s), and from about 0.2 to about 5 millimoles of rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, said rhenium-containing compound(s) providing in the final catalyst rhenium in a form which is extractable in a dilute (20 millimolar) aqueous sodium hydroxide solution;
- and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, cesium, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and cesium.
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103. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, alkali metal promoter and from about 0.2 to about 5 millimoles of rhenium promoter, measured as the metal, per kilogram of total catalyst, supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g;
- the combination of silver, alkali metal promoter, rhenium promoter and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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104. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, alkali metal promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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105. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, alkali metal promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide, supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g;
- the combination of silver, alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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106. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, alkali metal promoter and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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107. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, a higher alkali metal promoter comprising potassium, rubidium, cesium or mixtures thereof and from about 0.2 to about 5 millimoles of rhenium promoter measured as the metal, per kilogram of total catalyst supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g;
- the combination of silver, higher alkali metal promoter, rhenium promoter and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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108. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, a higher alkali metal promoter comprising potassium, rubidium, cesium or mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, higher alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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109. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, a higher alkali metal promoter comprising potassium, rubidium, cesium or mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide, supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g;
- the combination of silver, higher alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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110. A catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen comprising silver, a higher alkali metal promoter comprising potassium, rubidium, cesium or mixtures thereof and from about 0.2 to about 5 millimoles of rhenium, measured as the metal, per kilogram of total catalyst in a form which is extractable in a dilute (20 millimolar) aqueous solution of sodium hydroxide, supported on a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g wherein the rhenium is applied to the support in the form of a perrhenate or rhenium heptoxide;
- the combination of silver, higher alkali metal promoter, rhenium and support affording a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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111. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen which comprises impregnating a porous refractory support having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising silver, alkali metal and/or rhenium wherein the concentration of the silver (measured as the metal) in the solution ranges from about 1 g/l to the solubility limit of silver in the solution, the concentration of alkali metal (measured as the metal) in the solution ranges from about 1×
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
10-3 g/l to about 20 g/l to provide the catalyst with a catalytically effective amount of silver, a promoting amount of alkali metal and a promoting amount of rhenium.
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
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112. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which comprises impregnating a porous refractory support having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising solvent having silver compound(s) dissolved therein, and/or alkali metal compound(s) dissolved therein and/or rhenium-containing compound(s) dissolved therein sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver compound(s), measured as the metal, from about 20 to about 1500 ppm by weight of alkali metal compound(s), measured as the metal and from about 0.2 to about 5 millimoles per kilogram of total catalyst, measured as the metal, of rhenium-containing compound(s) to provide the catalyst with a catalytically effective amount of silver, a promoting amount of alkali metal and a promoting amount of rhenium.
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113. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising silver ions, alkali metal ions, rhenium-containing ions or mixtures thereof sufficient to deposit on the carrier from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of alkali metal compound(s), and from about 0.2 to about 5 millimoles of rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, alkali metal promoter, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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114. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising silver ions, alkali metal ions, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of alkali metal compound(s), and from about 0.2 to about 5 millimoles of rhenium compound(s), measured as the metal, per kilogram of total catalyst, said rhenium compound(s) providing in the final catalyst rhenium in a form which is extractable in a dilute (20 millimolar) aqueous sodium hydroxide solution;
- and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, alkali metal promoter, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and alkali metal.
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115. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen which comprises impregnating a porous refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising silver, and/or higher alkali metal selected from the group consisting of potassium, rubidium, cesium and mixtures thereof, and/or rhenium wherein the concentration of the silver (measured as the metal) in the solution ranges from about 1 g/l to the solubility limit of silver in the solution, the concentration of alkali metal (measured as the metal) in the solution ranges from about 1×
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
10-3 g/l to about 20 g/l to provide the catalyst with a catalytically effective amount of silver, a promoting amount of higher alkali metal and a promoting amount of rhenium.
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
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116. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which comprises impregnating a porous refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising solvent having silver compound(s) dissolved therein, and/or higher alkali metal compound(s) selected from compound(s) of potassium, rubidium, cesium and mixtures thereof dissolved therein and/or rhenium-containing compound(s) dissolved therein sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver compound(s), measured as the metal, from about 20 to about 1500 ppm by weight of higher alkali metal compound(s), measured as the metal, and from about 0.2 to about 5 millimoles per kilogram of total catalyst of rhenium-containing compound(s), measured as the metal, to provide a catalyst with a catalytically effective amount of silver, a promoting amount of higher alkali metal and a promoting amount of rhenium.
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117. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising silver ions, higher alkali metal ions selected from the group consisting of ions of potassium, rubidium, cesium and mixtures thereof, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of higher alkali metal compound(s) selected from compound(s) of potassium, rubidium, cesium and mixtures thereof, and from about 0.2 to about 5 millimoles of rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, higher alkali metal promoter, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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118. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising silver ions, higher alkali metal ions selected from the group consisting of ions of potassium, rubidium, cesium and mixtures thereof, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of higher alkali metal compound(s) selected from compound(s) of potassium, rubidium, cesium and mixtures thereof, and from about 0.2 to about 5 millimoles of a rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, said rhenium-containing compound(s) providing in the final catalyst rhenium in a form which is extractable in a dilute (20 millimolar) aqueous sodium hydroxide solution;
- and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, higher alkali metal, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and higher alkali metal.
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119. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which comprises impregnating a porous refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising silver, and/or cesium and/or rhenium wherein the concentration of the silver (measured as the metal) in the solution ranges from about 1 g/l to the solubility limit of silver in the solution, the concentration of cesium (measured as the metal) in the solution ranges from about 1×
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
10-3 g/l to about 20 g/l to provide the catalyst with a catalytically effective amount of silver, a promoting amount of cesium and a promoting amount of rhenium.
- 10-3 g/l to about 12 g/l and the concentration of the rhenium (measured as the metal) ranges from about 5×
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120. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which comprises impregnating a porous refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising solvent having silver compound(s) dissolved therein, and/or cesium compound(s) dissolved therein and/or rhenium-containing compound(s) dissolved therein sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver compound(s), measured as the metal, from about 20 to about 1500 ppm by weight of cesium compound(s) measured as the metal, and from about 0.2 to about 5 millimoles per kilogram of total catalyst of rhenium-containing compound(s), measured as the metal, to provide the catalyst with a catalytically effective amount of silver, a promoting amount of cesium and a promoting amount of rhenium.
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121. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 g with one or more solutions comprising silver ions, cesium ions, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of cesium and from about 0.2 to about 5 millimoles of rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, cesium, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and cesium.
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122. A process for preparing a catalyst for the vapor phase production of ethylene oxide from ethylene and molecular oxygen which process comprises impregnating a porous, refractory support comprising alpha alumina having a surface area ranging from about 0.05 to about 10 m2 /g with one or more solutions comprising silver ions, cesium ions, rhenium-containing ions or mixtures thereof sufficient to deposit on the support from about 1 to about 25 percent by weight of total catalyst of silver, from about 20 to about 1500 parts by weight, measured as the metal, per million parts by weight of total catalyst, of cesium compound(s), and from about 0.2 to about 5 millimoles of rhenium-containing compound(s), measured as the metal, per kilogram of total catalyst, said rhenium-containing compound(s) providing in the final catalyst rhenium in a form which is extractable in a dilute (20 millimolar) aqueous sodium hydroxide solution;
- and after impregnation, reducing the silver on the support to metallic silver to cause the combination of silver, cesium, rhenium and support to have a higher selectivity to ethylene oxide at a given oxygen conversion level than is obtained under the same reaction conditions with the same combination of silver and support and none or one of the promoters selected from rhenium and cesium.
Specification