Exhaust gas purification catalyst for automobile, exhaust gas purification catalyst system, and exhaust gas purification method

摘要

The present invention provides an exhaust gas purification catalyst for automobile which is capable of raising temperature of exhaust gas exhausted from combustion engines such as diesel engine cars and converting NO in the exhaust gas to NO 2 , in addition, an exhaust gas purification catalyst system to purify soot, soluble organic component and NOx component exhausted from diesel engines, and a purifying process of exhaust gas. The present invention is an exhaust gas purification catalyst composition to oxidize NO in automobile exhaust gas comprising a catalyst composition in which a noble metal catalyst component (A) is supported on a heat-resistant inorganic oxide (B), and an exhaust gas purification catalyst composition etc. for automobile characterized in that the noble metal catalyst component (A) comprises platinum (Pt) existing in a state of elemental substance in the catalyst composition and platinum - palladium (Pt-Pd) existing in a state of alloy in the catalyst composition are provided.