EXHAUST GAS PURIFICATION CATALYST, AND CATALYTIC HONEY-COMB STRUCTURE FOR EXHAUST GAS PURIFICATION

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Disclosed are : an exhaust gas purification catalyst which is an inexpensive three-way catalyst, which contains a reduced amount of an expensive noble metal, particularly does not use Pt, and contains no expensive rare earth element, and which has the same level of catalytic activity as that of a conventional one; and a catalytic honey-comb structure for exhaust gas purification. Specifically disclosed are : an exhaust gas purification catalyst comprising (A) an oxide M(Co1-yFey)O3-δ [wherein M represents a combination of an element substantially selected from Ba and Sr; y represents a number of 0 to 1; and Hrepresents a value that is so defined as to satisfy the charge neutrality condition] carrying one or two noble metals selected from Pd and Rh and (B) active alumina carrying one or two noble metal selected from Pd and Rh; and a catalytic honey-comb structure for exhaust gas purification, which is produced by wash-coating the exhaust gas purification catalyst onto a ceramic-or metal-made honey-comb.© KIPO & WIPO 2009