Purification device for gases
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United States of America Patent
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Sep 3, 2002
Issued Date -
N/A
app pub date -
Jan 19, 2000
filing date -
Dec 13, 1995
priority date (Note) -
Expired
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Abstract
An exhaust gas purification device includes a porous body of catalytic material of the general formula A.sub.a B.sub.b O.sub.4 disposed in an exhaust gas stream of an engine. The porous body of catalytic material has a characteristic response temperature above which it is catalytically active to reduce pollutants in the presence of a reducing agent. The porous body stores at least 20% by volume hydrocarbons at temperatures below the response temperature. A represent at least one element selected from Mg, Ca, Mn, Fe, Ni, Co, Cu, Zn, Sn, Ti and A+B is less than 3, A is greater than 0 and B greater than 0.
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