Exhaust gas purification catalyst and exhaust gas...

B - Operations – Transporting – 01 – J

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B01J 23/89 (2006.01) B01D 53/94 (2006.01)

Patent

CA 2632746

A catalyst for exhaust gas purification that excels in exhaust gas purification performance and thermal stability, realizing low cost and precious metal saving; and a relevant catalyst member. There is provided a catalyst for exhaust gas purification characterized by having substantially a perovskite crystal structure and being composed of a composite oxide of the formula (1) carrying at least one or two or more types of elements selected from among Pt, Pd and Rh, and further provided a catalyst member making use of the same. A.alpha.B1-xB~xO3-.delta. (1) wherein A is substantially an element, or a combination of two elements, selected from among Ba and Sr; B is substantially an element, or a combination of two elements, selected from among Fe and Co; B~ is substantially an element, or a combination of two elements, selected from among Nb, Ta and Ti; .alpha. is 0.95 to 1.05; x is 0.05 to 0.3; and .delta. is a value determined so as to satisfy the condition of charge neutrality.

L~invention concerne un catalyseur pour la purification de gaz d~échappement permettant d~obtenir une excellente purification de gaz d~échappement et présentant une excellente stabilité thermique, permettant de récupérer des métaux précieux à faible coût ; ainsi qu~un élément important de catalyseur. Le catalyseur pour purification de gaz d~échappement selon l~invention est caractérisé en ce qu~il présente sensiblement une structure cristalline de perovskite et en ce qu~il est composé d~un oxyde composite de formule (1) comportant au moins un ou plusieurs types d'éléments choisis parmi Pt, Pd et Rh. L~invention concerne également un élément de catalyseur utilisant ce catalyseur. A.alpha.B1-xB~xO3-.delta. (1) dans laquelle A représente un élément ou un mélange de deux éléments, choisis parmi Ba et Sr ; B représente un élément ou un mélange de deux éléments choisis parmi Fe et Co ; B~ représente sensiblement un élément ou un mélange de deux éléments choisis parmi Nb, Ta et Ti ; .alpha. vaut entre 0,95 et 1,05 ; x vaut entre 0,05 et 0,3 ; et .delta. représente une valeur déterminée de manière à satisfaire la condition de neutralité de charge.

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