| 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 motorcars and the like by using the exhaust gas purification catalyst of zeolite having an SiO2/Al2O3 molar ratio of specified value or more and containing Co, rare earth metals, Pt and/or Mn. CONSTITUTION:The zeolite having an SiO2/Al2O3 molar ratio of at least 15 contains Co, rare earth metals, such as La, and Pt and/or Mn, preferably, in a Co amount of 10-150mol%, in a rare earth metal amount of 10-100mol%, in a Pt and/or Mn in an amount of 5-150mol%, and in the total amounts of 100-250mol% of the alumina in the zeolite, thus permitting nitrogen oxide, CO, and hydrocarbon to be removed efficiently at the same time in a comparatively wide temperature range from the exhaust gas exhausted from the internal combustion engines of motorcars and the like by using this catalyst. |
