Process for making a silver catalyst
AssigneeTexaco Development Corporation
InventorStanley B. Cavitt
Life of this patent
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Abstract
A highly-active catalyst is prepared by abrading or wearing away the surface of a silver catalyst whereby 1 to about 10 weight percent of the catalyst is removed. The initial silver catalyst is formed, for example, by impregnating a porous catalyst support with a solution of a silver salt an organic amine solubilizing/reducing agent, an aqueous solvent and a cesium or rubidium salt sufficient to deposit on the support an effective amount of the said alkali metal and subsequently heating the impregnated support at an elevated temperature to evaporate volatiles and activate the catalyst.
Claims26
A process for making a highly-active silver catalyst for the vapor phase epoxidation of ethylene with an oxygen-containing gas which comprises:
- contacting a porous, inorganic, catalyst support material with an impregnating solution;
- and,
- heating the impregnated support material at temperatures from about 50.degree. C. to 300.degree. C. to evaporate volatiles and activate said catlyst,
- wherein the said impregnating solution comprises:
- (a) a silver salt,
- (b) an organic amine solubilizing/reducing agent,
- (c) a salt of a higher alkali metal selected from the group consisting of cesium and rubidium sufficient to deposit on the said support an effective amount of the said higher alkali metal, and
- (d) an aqueous solvent and subsequently abrading the surface of the catalyst to remove about 1 to about 10 weight percent of the catalyst.
A process for making a highly-active silver catalyst for the vapor phase phase epoxidation of ethylene with an oxygen-containing gas which comprises:
- contacting a porous, inorganic catalyst support with an aqueous impregnating solution of a salt of a higher alkali metal selected from the group consisting of cesium, rubidium, and mixtures thereof sufficient to deposit on the said support an effective amount of the said higher alkali metal,
- drying the impregnated support at a temperature of about 50.degree. to about 150.degree. C.
- contacting the impregnated catalyst support with a second impregnating solution and heating the thus-impregnated support at a temperature of about 50.degree. to about 300.degree. C. to evaporate volatiles and to activate the catalyst,
- wherein the second impregnating solution comprises:
- (a) silver salt,
- (b) an organic amine solubilizing/reducing agent, and
- (c) an aqueous solvent, and subsequently abrading the surface of the catalyst to remove about 1 to about 10 weight percent of the catalyst.
Dependencies are inferred from the claim text.