Mazda Motor Corporation

Tomoya Takizawa

Koichiro Harada

Takashi Baba

An exhaust gas purifier is disposed in an exhaust gas passage of an engine, and includes: a DPF for capturing PM contained in exhaust gas; an SCR catalyst provided downstream of the DPF in a direction of flow of the exhaust gas, and for reducing NOcontained in the exhaust gas for purification in the presence of NH; an injection unit provided between the DPF and the SCR catalyst, and for supplying urea to the SCR catalyst so as to supply NHto the SCR catalyst; and an AMOX provided downstream of the SCR catalyst in the direction of flow of the exhaust gas, and for removing NHhaving passed through the SCR catalyst. The DPF does not contain Pt or Pd, and contains Rh. The AMOX contains Pt.

Exhaust gas purification system

A catalystprovided for a filter body for combusting PM contains activated aluminasand, active-oxygen-release materialsand, catalytic metal, and alkali earth metal. The alkali earth metalis loaded on each of the activated aluminasand, and the active-oxygen-release materialsand. A percentage by mass of the alkali earth metal, loaded on the active-oxygen-release materialsand, to the active-oxygen-release material is smaller than a percentage by mass of the alkali earth metal, loaded on the activated aluminasand, to the activated alumina.

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Hiroshima, Japan

Tomoya Takizawa