Patent ID: 7229948
Filing Date: 2007-06-12
Classification: B01D,B01J,Y02A,Y02T

Abstract:
1. A method of making a washcoat for use in the manufacture of a catalytic device, the method comprising: preparing a liquid solution including metal oxide precursors of praseodymium and cerium, and at least one additional metal selected from the group consisting of zirconium and yttrium; absorbing the liquid solution onto a porous structured organic templating material that is capable of being combusted at an elevated temperature; heating the organic templating material containing the absorbed liquid solution to vaporize the liquid, convert the precursors to metal oxides, and combust said organic templating material, whereby a solid solution praseodymium-cerium oxide mixture doped with at least one of zirconium and yttrium is obtained; and adding a precious metal to the oxide mixture in an amount no greater than about 2 wt.%.