CATALYST FOR PURIFYING EXHAUST GAS

摘要

PURPOSE:To obtain a catalyst efficiently purifying NOx even in an oxidative atmosphere and having heat resistance and durability by supporting an active element by a crystalline silicoaluminophosphate porous carrier. CONSTITUTION:An active element selected from transition elements having atomic numbers of 22-29 reducing NOx is supported by a crystalline silicoaluminophosphate porous carrier having a large number of pores having a diameter of about 5-10Angstrom on the surface thereof. The catalyst thus obtained for purifying exhaust gas purifies NOx efficiently even in an oxidative atmosphere whose air/fuel ratio is on a lean side (A>F>14.7) and has excellent heat resistance and durability.