| 摘要 |
PROBLEM TO BE SOLVED: To obtain a catalyst for the purification of exhaust gas capable of enhancing NOx removing performance even in a low temp. region and a low HC to NOx ratio in which a conventional catalyst cannot exhibit satisfactory purifying ability and capable of suppressing the deterioration of the catalyst even under high temp. hydrothermal conditions and to provide a method for purifying exhaust gas. SOLUTION: The catalyst for the purification of exhaust gas contains a 1st catalyst layer contg. a Pt and/or Pd component, a Ba component and a Ti component and a 2nd catalyst layer contg. a Cu and/or Rh component disposed on the 1st catalyst layer. The catalyst is appropriately used in an internal combustion engine which discharges exhaust gas having an air-fuel ratio of >=18, >=5% concn. of oxygen and an HC to NOx ratio of >0 to 10. |
