US 4,062,810 A · Carrier-supported catalyst

Abstract

The invention provides a carrier-supported catalyst, wherein alumina partially converted to .alpha.-Al.sub.2 O.sub.3 is the carrier having between 0.2 and 10 weight % of cerium in oxide form deposited thereon as the catalytically active ingredient. The carrier supported catalyst is made by compressing hydrous alumina or unstable anhydrous alumina into shapes. The shapes are annealed for 10-20 hours at 1000.degree.-1250.degree. C. The annealed shapes are impregnated with an aqueous solution of a cerium salt of a readily decomposable acid and dried at 130.degree.-150.degree. C. The dry cerium salt is decomposed by gradually heating the shapes at 20.degree.-300.degree. C and 450.degree.-550.degree. C, respectively, and the resulting cerium oxide-containing shapes are annealed at 700.degree.-900.degree. C.

Claims4

Dependent claims

A carrier-supported catalyst, wherein the active ingredient consists essentially of cerium in oxide form and wherein 0.2 to 10 weight% of cerium, based on the carrier, is deposited thereon and wherein the carrier is produced by suspending aluminum oxide selected from the group consisting of delta-alumina and boehmite, and having an alkali content of up to 0.2 weight%, in water;

heating the resulting highly viscous magma so as to form a dry mass;
admixing graphite to the dry mass and grinding it;
compressing the ground graphite-containing mass into shapes;
burning off the graphite from the shapes at temperatures within the range 550.degree. to 750.degree. C;
and calcining the shapes for periods within the range 10 to 20 hours at temperatures within the range 1000.degree. to 1250.degree. C.

2 more elements

Dependencies are inferred from the claim text.

Carrier-supported catalyst

Life of this patent

Carrier-supported catalyst

Life of this patent

Abstract

Claims4