Catalyst for purifying exhaust gas

Details Catalyst for purifying exhaust gas Catalyst for purifying exhaust gas

2005-12-01

2010-06-15

Nguyen, Cam N (Department: 1793)

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S242000, C502S249000, C502S253000, C502S261000, C502S262000, C502S326000, C502S327000, C502S332000, C502S333000, C502S334000, C502S339000, C502S340000, C502S341000, C502S342000, C502S343000, C502S349000, C502S350000, C502S351000, C502S352000, C502S353000, C502S354000, C502S355000, C502S415000, C502S439000

Reexamination Certificate

active

07737078

ABSTRACT:
The formation of H2S in a stoichiometric or reducing atmosphere is restrained without using Ni or Cu as an environmental load substance. An additional oxide composed of an oxide of at least one kind of metal selected from the group consisting of Bi, Sn and Zn was added to a three-way catalyst for purifying an exhaust gas emitted from an internal combustion engine of which the combustion is controlled in near a stoichiometric atmosphere in the amount of from 0.02 mol to 0.2 mol per liter of the catalyst. The additional oxide forms SO3or SO4from SO2in an oxidizing atmosphere, and stores sulfur components as a sulfide in a reducing atmosphere so that emission of H2S can be restrained. And since no environmental load substance is contained, the catalyst can be used safely.

REFERENCES:
patent: 3397154 (1968-08-01), Talsma
patent: 3511888 (1970-05-01), Jenkins
patent: 3692701 (1972-09-01), Box, Jr.
patent: 3919120 (1975-11-01), Kato et al.
patent: 3939220 (1976-02-01), Rausch
patent: 4061592 (1977-12-01), Buss
patent: 4082697 (1978-04-01), Tamm
patent: 4169815 (1979-10-01), Drehman
patent: 4210561 (1980-07-01), Antos
patent: 4786625 (1988-11-01), Imai et al.
patent: 5059574 (1991-10-01), Abrevaya
patent: 5105032 (1992-04-01), Holbrook et al.
patent: 5430220 (1995-07-01), Khare et al.
patent: 5877369 (1999-03-01), Wu et al.
patent: 5892102 (1999-04-01), Mikami et al.
patent: 5898011 (1999-04-01), Wu et al.
patent: 5911961 (1999-06-01), Horiuchi et al.
patent: 5935529 (1999-08-01), Saito et al.
patent: 6017844 (2000-01-01), Wu et al.
patent: RE37663 (2002-04-01), Golunski et al.
patent: 6482766 (2002-11-01), Chaumette et al.
patent: 6685899 (2004-02-01), Park
patent: 7125822 (2006-10-01), Nakano et al.
patent: 7153807 (2006-12-01), Molinier et al.
patent: 7235507 (2007-06-01), Xu et al.
patent: 2002/0045544 (2002-04-01), Le Peltier et al.
patent: 2005/0131255 (2005-06-01), Benderly et al.
patent: 2006/0030481 (2006-02-01), LaBarge et al.
patent: 38 30 319 (1989-07-01), None
patent: 0 532 024 (1993-03-01), None
patent: 1 312 413 (2003-05-01), None
patent: 61-20342 (1986-05-01), None
patent: 2-20561 (1990-05-01), None
patent: 05-81521 (1993-11-01), None
patent: 09-075739 (1997-03-01), None
patent: 11-005035 (1999-01-01), None
patent: 2002-336703 (2002-11-01), None
Extended European Search Report dated Oct. 27, 2009 for EP Application No. 05814418.9.

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