Liqiang Q Xu

US Patent:

20060035780, Feb 16, 2006

Filed:

Aug 14, 2004

Appl. No.:

10/918271

Inventors:

Liqiang Xu - Flourtown PA, US
Yinyan Huang - Framingham MA, US
Gregory Cullen - Amesbury MA, US
Zhongyuan Dang - Canton MA, US
Amiram Bar-Ilan - Brookline MA, US

International Classification:

B01J 29/06
B01J 29/00
B01J 21/00

US Classification:

502066000, 502064000, 502071000, 502077000

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