| 摘要 |
The present invention provides an exhaust gas purification catalyst and catalyst member superior in exhaust gas purification performance and heat resistance, low in cost, and reducing use of precious metals, that is, an exhaust gas purification catalyst, and a catalyst member using the same, comprising a composite oxide having a substantially perovskite type crystalline structure and expressed by the following formula <1> on which one or more elements selected from at least Pt, Pd, and Rh are carried:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒA ± B 1-x B' x O 3-´ €ƒ€ƒ€ƒ€ƒ€ƒ<1>
(where, A indicates one element or a combination of two elements selected substantially from Ba and Sr, B indicates one element or a combination of two elements selected substantially from Fe and Co, B' indicates one element or a combination of two or more elements selected substantially from Nb, Ta, and Ti, ± is 0.95 to 1.05, x is 0.05 to 0.3, and ´ is a value determined so as to satisfy charge neutral conditions).
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