Patent ID: 7307038
Filing Date: 2007-12-11
Classification: B01D,B01J,C10G

Abstract:
1. A method of preparing a metal oxide composition comprising (a) at least 1 wt % of an acidic metal oxide which contains substantially no zeolite; (b) at least 0.5 wt % of a metal, measured as the metal oxide, selected from the group consisting of alkali metal, alkaline earth metal and mixtures thereof, and (c) at least 0.1 wt % of an oxygen storage metal oxide component selected from the group consisting of an oxygen storage rare earth metal oxide, an oxygen storage transition metal oxide, and mixtures thereof, said method comprising (i) preparing an aqueous slurry containing from about 10 to about 30 weight percent solids of a peptized acidic metal oxide and a metal selected from the group consisting of an alkali metal, an alkaline earth metal and mixtures thereof in an amount sufficient to provide at least 0.5 weight percent alkali metal and/or alkaline earth metal in a final metal oxide composition; (ii) forming an oxygen storage metal containing slurry by mixing the aqueous slurry with an oxygen storage metal salt in an amount sufficient to provide at least 0.1 weight percent of an oxygen storage metal oxide in the final metal oxide composition, wherein the oxygen storage metal salt comprises an oxygen storage metal is selected from the group consisting of an oxygen storage rare earth metal, an oxygen storage transition metal, and mixtures thereof; (iii) optionally, adding to the slurry of (i) or (ii) an additional acidic metal oxide source in an amount sufficient to provide a total of at least 5.0 weight percent of acidic metal oxide in the final metal oxide composition; (iv) milling the slurry of ii or iii to reduce the particle size of the solids contained in the slurry to 10 microns or less; (v) spray-drying the milled slurry to obtain particles having a mean particle size of greater than 45 μm; and (vi) calcining the spray-dried particles at a sufficient temperature and for a sufficient time to provide a final metal oxide composition comprising components (a)-(c).