Method of purifying exhaust gases
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United States of America Patent
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-
Aug 20, 1991
Issued Date -
N/A
app pub date -
Jan 30, 1989
filing date -
Oct 17, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The exhaust gases, such as of an internal combustion engine are contacted with a catalyst containing copper in the presence of hydrocarbons in an oxidizing atmosphere, whereby nitrogen oxides are reduced from the exhaust gases. Then, the exhaust gases are preferably contacted with an oxidizing catalyst. The former catalyst contains copper loaded on a porous support formed from alumina, silica, silica-alumina or zeolite or mixture thereof. The support is preferably a monolithic body having a first portion loaded with copper and a second portion loaded with a metal or metals defining the oxidizing catalyst.
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