CATALYST FOR PURIFICATION OF EXHAUST GAS AND METHOD FOR USING THE SAME

摘要

PURPOSE:To obtain a catalyst for purification of exhaust gas contg. excess oxygen with high activity and long service life by incorporating cobalt and an alkaline earth metal into zeolite having a certain ratio of SiO2 to Al2O3. CONSTITUTION:A zeolite catalyst for removal of NOx, CO and hydrocarbon from exhaust gas contg. excess oxygen is made of zeolite having >=15 molar ratio of SiO2 to Al2O3, and cobalt and an alkaline earth metal such as Be or Mg are incorporated into the zeolite. When the resulting catalyst is used, NOx, CO and hydrocarbon are simultaneously removed from exhaust gas contg. excess oxygen. The catalyst hardly causes heat deterioration and has superior durability and high activity.