Catalyst containing little or no rhodium for purifying exhaust gases of internal combustion engine
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United States of America Patent
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Issued Date -
Feb 21, 2008
app pub date -
Aug 15, 2007
filing date -
Aug 16, 2006
priority date (Note) -
Abandoned
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Abstract
Disclosed herein is a three-way conversion (TWC) catalyst containing little or no rhodium for purifying exhaust gases of an internal combustion engine, having a multi-layers structure, including a lower layer including an alumina support and an oxygen storage material; an intermediate layer including alumina support impregnated only with palladium and a zirconia-rich oxygen storage material; and an upper layer including alumina support impregnated with platinum, minimum rhodium and platinum, or platinum-palladium and a ceria-rich oxygen storage material.
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