Small pore molecular sieve supported copper catalysts durable against lean/rich aging for the reduction of nitrogen oxides
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United States of America Patent
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Jan 24, 2012
Grant Date -
Nov 17, 2011
app pub date -
Jul 25, 2011
filing date -
Apr 17, 2009
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Abstract
A method of using a catalyst comprises exposing a catalyst to at least one reactant in a chemical process. The catalyst comprises copper and a small pore molecular sieve having a maximum ring size of eight tetrahedral atoms. The chemical process undergoes at least one period of exposure to a reducing atmosphere. The catalyst has an initial activity and the catalyst has a final activity after the at least one period of exposure to the reducing atmosphere. The final activity is within 30% of the initial activity at a temperature between 200 and 500° C.
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