Diesel emission treatment using precious metal on titania aerogel
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United States of America Patent
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Jun 16, 1998
Grant Date -
N/A
app pub date -
Mar 10, 1997
filing date -
Mar 10, 1997
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Expired
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Abstract
The invention is a method for treating exhaust gases generated by a diesel engine by providing a sulfur-tolerant lean-NOx catalyst in an exhaust gas passage of the engine and contacting the catalyst with the exhaust gases. The sulfur-tolerant lean-NOx catalyst comprises a support of titania aerogel; and loaded thereon, using impregnation techniques from a solution of their precursors, at least 0.25 weight percent precious metal selected from platinum, palladium, rhodium, or mixtures thereof. The method converts the hydrocarbons, carbon monoxide and nitrogen oxides into more desirable gases. In particular, the NOx is converted to N.sub.2 and O.sub.2 over the catalyst.
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