Preparation of catalyst and use for high yield conversion of methane to ethylene
DCFirst Claim
1. A method of oxidative coupling of methane for the formation of heavier hydrocarbons, the method comprising the steps of:
- producing a perovskite catalyst, the catalyst produced by a process comprising;
forming an aqueous slurry comprising an alkaline earth metal salt, a powdered metal salt and a powdered transition metal oxide,wherein the alkaline earth metal is selected from the group consisting of barium, calcium and strontium salts, and wherein the metal oxide is titanium oxide;
adding a polymeric binder to the slurry to form a paste;
drying the paste for forming a powder;
heating the powder at increasing temperatures at apredetermined profile commensurate with the polymeric binder; and
calcining the heated powder; and
contacting a feed gas stream containing methane and oxygen in an oxidative coupling reactor under oxidative coupling conditions in the presence of the perovskite catalyst.
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Abstract
A perovskite catalyst is prepared using a ceramic sol-sol methodology comprising preparing slurry in water of an alkaline earth metal salt, a powdered metal salt and a powdered transition metal oxide, adding a polymeric binder to form a paste, drying and comminuting the paste into a powder and heating the powder with a temperature profile to calcination temperatures. In one embodiment the slurry is formed of titanium oxide with barium carbonate and tin chloride in deionized water, and more specifically by a mixture according to Ba (1-0.05x)+TiO2+SnCl2(0.05x) where x is in moles. The perovskite catalyst is preferably used in a process for oxidative coupling of methane. Catalyst performance is enhanced through the addition of halides to the feed gas in the reaction.
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Citations
19 Claims
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1. A method of oxidative coupling of methane for the formation of heavier hydrocarbons, the method comprising the steps of:
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producing a perovskite catalyst, the catalyst produced by a process comprising; forming an aqueous slurry comprising an alkaline earth metal salt, a powdered metal salt and a powdered transition metal oxide, wherein the alkaline earth metal is selected from the group consisting of barium, calcium and strontium salts, and wherein the metal oxide is titanium oxide; adding a polymeric binder to the slurry to form a paste; drying the paste for forming a powder; heating the powder at increasing temperatures at a predetermined profile commensurate with the polymeric binder; and calcining the heated powder; and contacting a feed gas stream containing methane and oxygen in an oxidative coupling reactor under oxidative coupling conditions in the presence of the perovskite catalyst. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of oxidative coupling of methane for the formation of heavier hydrocarbons, the method comprising the steps of:
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producing a perovskite catalyst, the catalyst produced by a process comprising; forming an aqueous slurry comprising an alkaline earth metal salt, a powdered metal salt and a powdered transition metal oxide, wherein the alkaline earth metal is selected from the group consisting of calcium (Ca), barium (Ba) and strontium (Sr) salts, wherein the metal salt is tin (Sn);
wherein the transition metal oxide is titanium oxide;drying the slurry to form a powder; heating the powder at increasing temperatures at a predetermined profile; and calcining the heated powder to produce the perovskite catalyst, wherein the perovskite catalyst comprises a mixture including Ba+TiO2+R, wherein R is tin (Sn); and contacting a feed gas stream containing methane and oxygen in an oxidative coupling reactor under oxidative coupling conditions in the presence of the perovskite catalyst. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification