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CATALYST SYSTEM FOR USE IN EXHAUST GAS PURIFICATION APPARATUS FOR AUTOMOBILES, EXHAUST GAS PURIFICATION APPARATUS USING THE CATALYST SYSTEM, AND EXHAUST GAS PURIFICATION METHOD
CATALYST SYSTEM FOR USE IN EXHAUST GAS PURIFICATION APPARATUS FOR AUTOMOBILES, EXHAUST GAS PURIFICATION APPARATUS USING THE CATALYST SYSTEM, AND EXHAUST GAS PURIFICATION METHOD
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机译:用于汽车排气净化装置的催化剂系统,使用该催化剂系统的排气净化装置以及排气净化方法
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摘要
A catalyst system to be used in an automobile exhaust gas purification apparatus which exerts excellent purification capability to a nitrogen oxide, even when hydrocarbon concentration varies, by subjecting exhaust gas discharged from an automotive internal engine to contacting with a catalyst, an exhaust gas purification apparatus using the same, and an exhaust gas purification method.;A catalyst system etc. to be used in an automobile exhaust gas purification apparatus, composed by using two or more exhaust gas purification catalysts, containing a first catalyst supported on an inorganic structural carrier and a second catalyst other than this, characterized by having the first catalyst supported on a part of the inorganic structural carrier positioned at the upstream side, when arranged in an exhaust gas passage; on the other hand having the second catalyst supported on a part of the inorganic structural carrier, positioned at the downstream side, when arranged in an exhaust gas passage; and containing a cerium-zirconium-type composite oxide (A) having a pyrochlore phase in the crystal structure.
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