EXHAUST GAS PURIFICATION MATERIAL

摘要

An exhaust gas purification material according to the present invention is provided with a particulate filter (10) which traps particulate matter in exhaust gas, the filter (10) containing an SCR catalyst for adsorbing ammonia and reducing NOx in the exhaust gas. The maximum permissible adsorption amount of ammonia adsorbable by the filter (10) differs between an upstream-side portion (10a) including an exhaust gas inlet-side end (10c) of the filter (10) and a downstream-side portion (10b) including an exhaust gas outlet-side end (10d) thereof. A maximum permissible adsorption amount (A) of ammonia in the upstream-side portion (10a) is smaller than a maximum permissible adsorption amount (B) of ammonia in the downstream-side portion (10b) (A