IP Library › Granted Patent US 8,496,896
Granted Patent B2
US 8,496,896 · App. 12/229,729 · Granted Jul 30, 2013

Zero platinum group metal catalysts

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Quick Facts
Patent No.
US 8,496,896
App. No.
12/229,729
Granted
Jul 30, 2013
Kind
B2
Abstract

The present invention relates improving the performance of nitrogen oxide reduction by exposing rich exhaust to catalysts systems comprising a catalyst, wherein the catalyst systems are free of platinum group metals. The present invention also relates to improving reduction of carbon monoxide and hydrocarbon in exhaust by introducing air into a portion of the exhaust between a first catalyst system and a second catalyst system. The present invention also relates to improving nitrogen oxide, carbon monoxide and hydrocarbon reduction by (1) exposing rich exhaust to a first catalysts system, wherein the exhaust has an R value of greater than 1.0 and the first catalyst system comprises a catalyst and is free of platinum group metals and (2) introducing air into a portion of the exhaust in between the first catalyst system and a second catalyst system, wherein the second catalyst system is free of platinum group metals.

Claims (7)

1. A method for reducing nitrogen oxide, carbon monoxide and hydrocarbon emission, comprising:

exposing an exhaust from combustion of fuel under fuel-rich operating conditions and containing nitrogen oxides, carbon monoxide and hydrocarbons to a three-way catalyst comprising one or more transition metals,

wherein the exhaust has an R value of greater than 1.0, and wherein the catalyst is substantially free of platinum group metals, and further wherein the catalyst is not a perovskite, to thereby simultaneously reduce, on the catalyst, the nitrogen oxides, carbon monoxide and hydrocarbons in the exhaust generated at said rich operating conditions.

2. The method of claim 1 , wherein the catalyst is completely free of platinum group metals.

3. The method of claim 1 , wherein the catalyst comprises copper, nickel, iron, manganese, silver, cobalt, tungsten, niobium, molybdenum, or chromium.

4. The method of claim 3 , wherein the catalyst comprises copper, nickel, iron, or manganese.

5. The method of claim 4 , wherein the catalyst comprises copper, nickel, or cobalt.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 18, 2014
From: ECS HOLDINGS, INC.
To: CATALYTIC SOLUTIONS, INC.
Reel/Frame 032515/0462 →