CATALYST COMPOSITIONS COMPRISING METAL OXID SUPPORT PARTICLES WITH SPECIFIC PARTICLE SIZE DISTRIBUTIONS

摘要

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 1μιηand a d5o less than 40 microns.