Methods of making highly dispersed substantially uniform cerium and zirconium mixed-metal-oxide composite supports for exhaust conversion catalysts

摘要: A method of making a unique, promoted support for improved catalysts conversion exhaust from internal combustion engines, said comprising mixed-metal-oxide promoter containing at least Ce and Zr substantially uniformly dispersed as homogeneous crystallites less than about 100 Å on high-surface-area refractory oxide substrate, dissolving combination Ce- Zr-oxide precursors, optionally another metal precursor, compatible organic depositing agent, slowly heating to transform the agent into gel-like matrix coating substrate in which precursor compounds are distributed thereafter calcining burn off form appropriate morphology.