| 简介 |
The present invention provides an exhaust gas purification catalyst which has a structure which prevents competitive adsorption of HC, CO, and NO X and enables effective utilization of an NO X storage reduction type catalyst. The exhaust gas purification catalyst of the present invention is characterized by having an NO X storage reduction type catalyst layer which contains at least one type of NO X storage material which is selected from an alkali metal or an alkali earth metal and Pt and/or Rh on a substrate and having an oxidation catalyst layer which carries Pt and/or Pd on the NO X storage reduction type catalyst layer. |
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