exhaust gas purification composition, use of an exhaust gas purification treatment composition, and, exhaust gas purification method to purify exhaust gas

摘要

Abstract Exhaust Purification Composition, Use of an Exhaust Purification Treatment Composition, and Exhaust Purification Method for Purifying Exhaust An Exhaust Purification Composition of the present invention contains zeolite which is be zeolite having a sio2 / al2o3 molar ratio greater than 25 and 600 or less and containing phosphorus. furthermore, the exhaust gas purifying composition preferably contains zirconium in addition to phosphorus. Furthermore, the zeolite has a sio2 / al2o3 molar ratio of 30 to 150. The present invention provides an exhaust gas purification composition having an excellent adsorption capacity of hc for exhaust gas purification in internal combustion engines such as gasoline engines.