CATALYST AND METHOD FOR REDUCING NITROGEN OXIDES IN EXHAUST STREAMS WITH HYDROCARBONS OR ALCOHOLS

WIPO Patent Application WO2006093802

A3

A catalyst system and a method for reducing nitrogen oxides in an exhaust gas by reduction with a hydrocarbon or oxygen-containing organic compound reducing agent are provided. The catalyst system contains a silver catalyst and a modifier catalyst, where the modifier catalyst contains a modifier oxide, where the modifier oxide is selected from the group consisting of iron oxide, cerium oxide, copper oxide, manganese oxide, chromium oxide, a lanthanide oxide, an actinide oxide, molybdenum oxide, tin oxide, indium oxide, rhenium oxide, tantalum oxide, osmium oxide, barium oxide, calcium oxide, strontium oxide, potassium oxide, vanadium oxide, nickel oxide, tungsten oxide, and mixtures thereof. The modifier oxide is supported on an inorganic oxide support or supports, where at least one of the inorganic oxide supports is an acidic support. The catalyst system of the silver catalyst and the modifier catalyst provides higher NOx conversion than either the silver catalyst or the modifier catalyst alone.

MALYALA RAJASHEKHARAM V (US)
GOLDEN STEPHEN J (US)

PCT/US2006/006454

November 23, 2006

February 24, 2006

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CATALYTIC SOLUTIONS INC (US)
MALYALA RAJASHEKHARAM V (US)
GOLDEN STEPHEN J (US)

B01J35/00; B01J21/04; B01J23/10; B01J23/50; B01J23/72; B01J23/745; B01J23/83; B01J35/04

US20030143142A1

2003-07-31

ERANEN K ET AL: "Continuous reduction of NO with octane over a silver/alumina catalyst in oxygen-rich exhaust gases: combined heterogeneous and surface-mediated homogeneous reactions", JOURNAL OF CATALYSIS, ACADEMIC PRESS, DULUTH, MN, US, vol. 219, no. 1, 1 October 2003 (2003-10-01), pages 25 - 40, XP004447421, ISSN: 0021-9517

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