EXHAUST GAS PURIFICATION APPARATUS

摘要

The exhaust gas purification apparatus is provided with: an upstream catalyst section which is disposed on the upstream side of an exhaust pipe; a downstream catalyst section which is disposed on the downstream side of the exhaust pipe with respect to the upstream catalyst section; and reducing agent solution supplier that supplies a reducing agent solution for generating ammonia from the upstream of the upstream catalyst section. The upstream catalyst section and the downstream catalyst section each include a SCR catalyst constituted by a zeolite, which adsorbs ammonia and reduces NOx in the exhaust gas. The skeleton density (A) of the SCR catalyst included in the upstream catalyst section is less than the skeleton density (B) of the SCR catalyst included in the downstream catalyst section (A

主权项

1. An exhaust gas purification apparatus disposed in an exhaust passage of an internal combustion engine to purify an exhaust gas discharged from the internal combustion engine, the apparatus comprising:
an upstream catalyst section which is disposed on an upstream side of the exhaust passage; a downstream catalyst section which is disposed on a downstream side of the exhaust passage with respect to the upstream catalyst section; and reducing agent solution supplier that supplies a reducing agent solution for generating ammonia from an upstream of the upstream catalyst section, wherein the upstream catalyst section and the downstream catalyst section each include a SCR catalyst constituted by a zeolite, the SCR catalyst adsorbing ammonia and reducing NOx in the exhaust gas, and a skeleton density (A) of the SCR catalyst included in the upstream catalyst section is less than a skeleton density (B) of the SCR catalyst included in the downstream catalyst section (A