| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a PM (particulate matter) combustion catalyst capable of demonstrating a sufficiently efficient cleaning performance even in evaluation under a loose contact condition without carrying an expensive platinum group for a Bi-based catalyst, and burning the PM whose main component is soot in exhaust gas discharged from an internal combustion engine at a lower temperature. <P>SOLUTION: The catalyst for cleaning the exhaust gas containing a composite oxide whose main component is Bi and Ce, for which the basic structure of the composite oxide is the tetragonal of Bi<SB>2</SB>O<SB>3</SB>, indicates a high PM cleaning performance even under the loose contact condition for PM combustion, and a catalyst performance is not lowered even when a heating deterioration test is performed further. <P>COPYRIGHT: (C)2010,JPO&INPIT |
