Catalyst for reducing nitrogen oxides in oxidizing and reducing atmospheres
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United States of America Patent
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Mar 18, 2003
Grant Date -
Dec 20, 2001
app pub date -
Jul 1, 1999
filing date -
Jul 4, 1998
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Expired
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Abstract
A catalyst for reducing nitrogen oxides in oxidizing and reducing atmospheres which contains iridium on a support material. Silicon dioxide or a dealuminized zeolite in the acid H form with a modulus of more than 20, preferably more than 100, or mixtures thereof are used as support materials. Iridium is deposited on the external surfaces of these support materials with average particle sizes between 10 and 30 nm. The catalyst is particularly suitable for treating exhaust gases from lean-burn gasoline engines or from diesel engines.
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