EXHAUST GAS PURIFICATION CATALYST, EXHAUST GAS PURIFICATION APPARATUS USING THE SAME AND EXHAUST GAS PURIFICATION METHOD
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United States of America Patent
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Issued Date -
Nov 10, 2011
app pub date -
Jan 26, 2010
filing date -
Mar 9, 2009
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Abandoned
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Abstract
An exhaust gas purification catalyst, which is suitable as a Three Way Catalyst for efficiently purifying carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NO.sub.x) in exhaust gas discharged from a gasoline automobile, an exhaust gas purification apparatus using the same and an exhaust gas purification method. It is provided by an exhaust gas purification catalyst, wherein catalyst components for purifying hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NO.sub.x) contained in exhaust gas are coated onto a honeycomb type structure as a catalyst composition layer, characterized in that the catalyst components comprise an activated metal (A), a heat resistant inorganic oxide (B) and a cerium-zirconium composite oxide (c) containing a pyrochlore phase in a crystal structure, in the same catalyst composition layer, and the activated metal (A) is a palladium and a rhodium and does not contain a platinum.
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