Patent ID: 6040265
Filing Date: 2000-03-21
Classification: B01D,B01J,Y02T

Abstract:
A method of preparing a promoted catalyst support effective in enhancing the performance of catalytically active metals in the conversion of exhaust gas from internal combustion engines, comprising:a. Impregnating a suitable refractory oxide support material with a solution of a primary metal acetate and at least one secondary metal acetate, said primary metal acetate selected from the group consisting of acetates of Ce and Zr that produce, when in admixture with said at least one secondary metal acetate, mixed-metal oxides after calcination, and an organic depositing reagent selected from the group consisting of soluble sugars, saccharides, polysaccharides, or derivations thereof, and polyols that upon drying forms a matrix in which said primary and secondary metal acetates remain intimately and uniformly mixed, thereby forming an impregnated support material and, thereafter,b. Drying and calcining the impregnated support material thereby producing a support having dispersed thereon a substantially homogeneous composition of mixed-metal-oxide crystallites, said composition containing less than about 10 wt. % single-metal-oxide crystallites, uniformly dispersed on a refractory-oxide-support.