Catalyst compositions, articles, methods and systems
AssigneeBASF SE
InventorsOlga Gerlach, Andreas Sundermann, Jeffrey B. Hoke
Life of this patent
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Abstract
Described are catalyst compositions, catalytic articles, exhaust gas treatment systems and methods that utilize the catalytic articles. The catalyst composition comprises a washcoat including a zeolite, refractory metal oxide support particles, and a platinum group metal supported on the refractory metal oxide support particles. Greater than 90% of the refractory metal oxide particles supporting PGM have a particle size greater than 1 μm and a d50 less than 40 microns.
Claims17
A catalyst composition comprising a washcoat including a zeolite, refractory metal oxide support particles, and a platinum group metal supported on the refractory metal oxide support particles, wherein greater than 90% of the refractory metal oxide particles supporting PGM have a particle size greater than 1 μm and a d50 less than 40 microns.
A method of preparing a catalytic article including a zeolite, refractory metal oxide support particles, and a platinum group metal supported on the refractory metal oxide support particles, wherein greater than 90% of the refractory metal oxide particles supporting PGM have a particle size greater than 1 μm and a d50 less than 40 microns, the method comprising impregnating refractory metal oxide support particles with a platinum group metal, spray drying the refractory metal oxide particles supporting PGM to increase the particle size, creating a slurry of the spray dried refractory metal oxide particles supporting PGM, adding the zeolite to the slurry to form a washcoat, and coating the washcoat on a substrate.
Dependencies are inferred from the claim text.