| 摘要 |
PURPOSE:To efficiently remove nitrogen oxide, CO, and hydrocarbon at the same time in a comparatively wide temperature range from the exhaust gas exhausted from the internal combustion engines of automobiles and the like by using the exhaust gas purification catalyst of zeolite containing silver having an SiO2/Al2O3 molar ratio of specified value or more. CONSTITUTION:The zeolite having an SiO2/Al2O3 molar ratio of at least 15 contains silver generally prepared by using water-soluble silver salt, such as silver nitrate, and an ion exchange or evaporation process or the like, preferably, in an amount of preferably, 10-150 molar % of alumina in the zeolite, thus permitting nitrogen oxide, CO, and hydrocarbon to be removed at the same time in a comparatively wide temperature range from the waste gas exhausted form the internal combustion engines of automobiles and the like by using this catalyst. |
