| 摘要 |
PROBLEM TO BE SOLVED: To enhance the efficiency of removal of NOx , HC and CO in exhaust gas. SOLUTION: This catalyst for removal of HC, CO and NOx in exhaust gas in an atmosphere contg. excess oxygen contains a 1st catalyst 1 contg. at least one of Pt and Rh and an NOx storage material and a 2nd catalyst 2 contg. Pd. Since Pd and at least one of Pt and Rh are separately carried, activities peculiar to the noble metals are exhibited and high rates of removal of HC, CO and NOx can be maintained. |
