| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst which is capable of combusting an adsorbed high boiling point hydrocarbon from a lower temperature region and exhibits high cleaning activity even after the thermal duration. <P>SOLUTION: The catalyst for cleaning exhaust gas consists of a main carrier consisting of a multiple oxide M-TiO<SB>X</SB>in which an oxide of at least one kind of metal M of Ta and Nb is solidly dissolved in one part of TiO<SB>2</SB>and SiO<SB>2</SB>colloid, an oxide having oxygen absorbing/desorbing ability, zeolite and a noble metal deposited at least on the main carrier. Although the reason is unknown, the dispersibility of noble metal deposited metal is drastically enhanced because of the inclusion of a small amount of SiO<SB>2</SB>colloid and the particle growth during the thermal duration is suppressed. Further, even in the state that the catalyst interface is covered with the high boiling hydrocarbon, the high boiling point hydrocarbon can be completely combusted from a low temperature region because oxygen is supplied to the catalyst interface. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
