Exhaust gas purifying device and method for purifying exhaust gas
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
Jun 10, 1999
filing date -
Oct 14, 1997
priority date (Note) -
Expired
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Abstract
An exhaust gas purifying catalyst for use in an oxygen surplus atmosphere, includes a brown millerite composite oxide for directly decomposing and absorbing nitrogen oxide (NO.sub.x), and a noble metal-series reducing catalyst disposed on the surface of said brown millerite composite oxide. The brown millerite composite oxide is represented by one of the following formulae: A.sub.3-a B.sub.a C.sub.4-b D.sub.b O.sub.9, A.sub.2-a B.sub.a C.sub.2-b D.sub.b O.sub.5, and A.sub.1-a B.sub.a C.sub.2-b D.sub.b O.sub.4 where A and B are elements selected from the group consisting of Ba, Ca, Sr, Mg and Ce, C and D are elements selected from the group consisting of Y, Dy, Zn, Ti, Mn, Fe, Co, Ni, Cu, Sn, Zr and Nd, a is within the range 0.ltoreq.a<1, and b is within the range 0.ltoreq.b<2.
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