Catalysts for the hydrogenation of maleic acid to 1,4-butanediol
AssigneeThe Standard Oil Company
InventorsJohn Raymond Budge, Thomas George Attig, Robert Allen Dubbert
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Abstract
An improved catalyst for the hydrogenation of maleic acid, maleic anhydride or other hydrogenatable precursor to 1,4-butanediol and tetrahydrofuran has been discovered. This hydrogenation catalyst comprises palladium, silver, rhenium and at least one of iron, aluminum, cobalt and mixtures thereof, all on a carbon support.
Claims25
A catalyst consisting essentially of palladium, silver, rhenium and at least one of iron, aluminum, cobalt and mixtures thereof on a carbon support.
A process for the production of 1,4-butanediol comprising catalytically hydrogenating a hydrogenatable precursor in contact with a hydrogen-containing gas and a hydrogenation catalyst comprising palladium, silver, rhenium and at least one of iron, aluminum, cobalt and mixtures thereof, on a carbon support.
A method for making catalyst for the production of 1,4-butanediol comprising
- (i) oxidizing a carbon support by contacting the carbon support with an oxidizing agent;
- (ii) impregnating in one or more impregnation steps comprising contacting a carbon support with a source of palladium, silver, rhenium and at least one of iron, aluminum, cobalt and mixtures thereof;
- (iii) drying the impregnated carbon support to remove solvent after each impregnation step;
- and
- (iv) heating the impregnated carbon support from ambient temperature to a temperature of between about 100.degree. C. and about 350.degree. C. under reducing conditions.
A process for the production of tetrahydrofuran and 1,4-butanediol comprising catalytically hydrogenating a hydrogenatable precursor in contact with a hydrogenation catalyst comprising palladium, silver, rhenium and at least one of iron, aluminum, cobalt and mixtures thereof, on a carbon support wherein the catalyst is prepared by the steps of
- (i) oxidizing a carbon support by contacting the carbon support with an oxidizing agent;
- (ii) impregnating in one or more impregnation steps comprising contacting the carbon support with a source of palladium, silver, rhenium and at least one of iron, aluminum, cobalt and mixtures thereof;
- (iii) drying the impregnated carbon support to remove solvent after each impregnation step;
- and
- (iv) heating the impregnated carbon support from ambient temperature to a temperature of between about 100.degree. C. and about 350.degree. C. under reducing conditions.
Dependencies are inferred from the claim text.