PROCESS FOR THE OXIDATION OF CARBON MONOXIDE AND HYDROCARBONS

摘要

PROCESS FOR THE OXIDATION OF CARBON MONOXIDE AND HYDROCARBONS. Carbon monoxide and hydrocarbons contained in exhaust gas of internal combustion engines are oxidized with oxygencontaining gas to carbon dioxide and water. The oxidation is effected at 150-800.degree.C in contact with a carrier-supported catalyst, wherein alumina partially converted to .alpha.-Al2O3 is the carrier and cerium in oxide form is the catalytically active ingredient, the catalytically active ingredient constituting 0.2 to 10 weight % of the carrier being deposited thereon, The oxidation is more particularly carried out in contact with a carrier-supported catalyst being produced by compressing hydrous alumina or unstable anhydrous alumina into shapes; annealing the shapes for 10 - 20 hours at 1000 - 1250.degree.C; impregnating the annealed shapes with an aqueous solution of a cerium salt of a readily decomposable acid; drying the cerium salt so applied to the shapes at 130 - 150.degree.C; decomposing the dry cerium salt by gradually heating the shapes to temperatures within the range 200 and 300.degree.C and 450 and 550.degree.C, respectively; and annealing the resulting shapes containing cerium oxide at 700 - 900.degree.C.