Catalyst composition for oxidation of ethylene to ethylene oxide
First Claim
1. A catalyst for the manufacture of ethylene oxide by the epoxidation of ethylene containing an impregnated silver metal on an inert, refractory solid support and an efficiency-enhancing amount, relative to the amount of silver metal, of a mixture of (i) a cesium salt of an oxyanion of an element selected from Groups 3through 7b inclusive, of the Periodic Table of the Elements, and (ii) at least one of an alkali metal salt of lithium, sodium, potassium and rubidium and an alkaline earth metal salt, in which the anions of such salts are halides of atomic numbers of 9 to 53, inclusive, and oxyanions of elements other than the oxygen therein having an atomic number of 7 or 15 to 83, inclusive, and selected from Groups 3a to 7a, inclusive, and 3b through 7b, inclusive, of the periodic Table of the Elements.
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Abstract
This invention relates to catalysts for the manufacture of ethylene oxide, especially at commercial concentrations in the presence of carbon dioxide gas recycle, which contains impregnated silver on a support and a mixture of cesium salt and one or more alkali metal and alkaline earth metal salts in which the anions thereof are halide or oxyanions of elements other than the oxygen therein having an atomic number of 7 or 15 to 83 and being from groups 3b through 7b, inclusive, and 3a through 7a, inclusive, of the Periodic Table of the Elements, at least a portion of said oxyanions are oxyanions of group 3b to 7b elements.
208 Citations
44 Claims
- 1. A catalyst for the manufacture of ethylene oxide by the epoxidation of ethylene containing an impregnated silver metal on an inert, refractory solid support and an efficiency-enhancing amount, relative to the amount of silver metal, of a mixture of (i) a cesium salt of an oxyanion of an element selected from Groups 3through 7b inclusive, of the Periodic Table of the Elements, and (ii) at least one of an alkali metal salt of lithium, sodium, potassium and rubidium and an alkaline earth metal salt, in which the anions of such salts are halides of atomic numbers of 9 to 53, inclusive, and oxyanions of elements other than the oxygen therein having an atomic number of 7 or 15 to 83, inclusive, and selected from Groups 3a to 7a, inclusive, and 3b through 7b, inclusive, of the periodic Table of the Elements.
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25. A catalyst for the manufacture of ethylene oxide by the epoxidation of ethylene containing an impregnated silver metal on an inert, refractory solid support and an efficiency-enhancing amount, relative to the amount of silver metal, of a mixture of (i) a cesium salt of an oxyanion of an element selected from Groups 3b through 7b inclusive, of the Periodic Table of the Elements;
- and (ii) an alkali metal salt of lithium, sodium, potassium and rubidium, in which the anions of such salts are oxyanions of elements other than the oxygen therein having an atomic number of 15 or 83 and selected from Groups 3a to 7a, inclusive, and 3b through 7b, inclusive, of the Periodic Table of the Elements.
- View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A catalyst suitable for the manufacture of ethylene oxide comprising an impregnated silver metal on an inert, refractory solid support and an efficiency-enhancing amount, relative to the amount of silver metal, of a mixture of (i) a cesium salt of an oxyanion of an element other than the oxygen therein selected from Groups 3b through 7b, inclusive, of the Periodic Table of the Elements;
- and (ii) an alkali metal salt of lithium, sodium, potassium and rubidium, in which the anions of such salts are oxyanions of elements other than the oxygen therein having an atomic number of at least 15 to 83 and being from Groups 3b to 7b, inclusive, and from 3a to 7a, inclusive of the Periodic Table of the Elements, which catalyst has been subjected to a process for making ethylene oxide by the reaction of ethylene and oxygen in which a stream comprising ethylene, oxygen, recycled carbon dioxide and a gas phase inhibitor is fed to a fixed bed of said catalyst and ethylene oxide is removed from the fixed bed of said catalyst.
- View Dependent Claims (42, 43, 44)
Specification