Catalyst for purifying diesel engine exhaust emissions

Details Catalyst for purifying diesel engine exhaust emissions Catalyst for purifying diesel engine exhaust emissions

2007-06-26

2007-06-26

Wood, Elizabeth D. (Department: 1755)

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

C502S064000, C502S066000, C502S067000, C502S068000, C502S071000, C502S074000, C502S077000, C502S078000, C502S079000, C502S080000, C502S084000, C502S527190, C502S527240

Reexamination Certificate

active

10918271

ABSTRACT:
A diesel oxidation catalyst comprising a honeycomb substrate washcoated with a mixture of clay, a refractory oxide and a zeolite is disclosed. The washcoated substrate is subsequently deposited with a precious metal catalyst and a sulfur oxidation suppressant. In a preferred embodiment, the clay is acid-leached bentonite, the refractory oxide is zirconia or titania, the zeolite is beta-zeolite or Y-zeolite or ZSM-5 or mordenite, the precious metal catalyst is preferably platinum, and the sulfur oxidation suppressant is vanadium or vanadium oxide or a combination thereof

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