SOx tolerant NOx trap catalysts and methods of making and using the same
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United States of America Patent
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Apr 10, 2007
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N/A
app pub date -
Jun 12, 2003
filing date -
Aug 9, 2000
priority date (Note) -
Expired
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Abstract
The present invention relates to sulfur tolerant catalyst composites useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved NOx trap catalysts for use in diesel engines as well as lean burn gasoline engines. The sulfur tolerant NOx trap catalyst composites comprise a platinum component, a support, a NOx sorbent component, and a spinel material prepared by calcining as anionic clay material represented by the formula M.sub.mN.sub.n(OH).sub.(2m+2n)A.sub.a.bH.sub.2O, wherein the formula is defined herein. The sulfur tolerant NOx trap catalyst composites are highly effective with a sulfur containing fuel by trapping sulfur oxide contaminants which tend to poison conventional NOx trap catalysts used to abate other pollutants in the stream. The sulfur tolerant NOx trap catalyst composites are suitable for diesel engines because the composites can be regenerated at moderate temperatures with rich pulses, rather than at high temperatures.
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