| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst for cleaning an exhaust gas with high durability in which a pressure loss of the exhaust gas is low and an exhaust gas cleaning performance is high. <P>SOLUTION: A circulation type catalyst carrier structure body is used for the catalyst for cleaning the exhaust gas and in the structure body and keeps a honeycomb base material coated with a catalyst carrier. A cell wall pore of the honeycomb base material and a cell wall surface are coated with the catalyst carrier. An amount of the catalyst carrier coating the cell wall surface is 10-40% by mass of the whole catalyst carrier and the coating layer of the catalyst carrier on the cell wall surface has a thickness less than 100 μm. The catalyst carrier coating the cell wall surface can be only positioned at a downstream side of the exhaust gas. The catalyst for cleaning the exhaust gas is constituted by making such a catalyst carrier structure body carry at least one kind of noble metal selected from Pt, Pd and Rh on. <P>COPYRIGHT: (C)2003,JPO |
