EXHAUST GAS CLEANING APPARATUS

摘要

PROBLEM TO BE SOLVED: To obtain an exhaust gas cleaning apparatus having a high reduction ratio of NOx contained in an exhaust gas, which features easy regeneration of a catalyst and is excellent in endurance life. SOLUTION: An exhaust gas cleaning catalyst carrier 8 containing a brownmillerite type complex oxide and a catalyst heater 7 are provided and the steps of decomposing and absorbing NOx in an exhaust gas by an exhaust gas cleaning catalyst and heating and regenerating the exhaust gas purification catalyst by the catalyst heater 7 are repeated. The exhaust gas purification catalyst comprises a brownmillerite type complex oxide and a metal oxide or a noble metal and the brownmillerite type complex oxide adsorbs and absorbs the NOx in the step of decomposition and absorption and the metal oxide or the noble metal decomposes the NOx into nitrogen and oxygen in the step of heating and regenerating. The brownmillerite type complex oxide includes a substance in a state of peroxide in a crystalline structure.