| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas purifying apparatus which reduces NOx by CO in an exhaust gas even if hydrocarbon is not included in the exhaust gas and there is no supply means of a reducing agent by the procedure except using the exhaust gas. <P>SOLUTION: The exhaust gas purifying apparatus is composed by arranging an NO selective oxidation catalyst of LaFeO<SB>3</SB>to selectively oxidize NO to NO<SB>2</SB>at the upstream of an exhaust gas flowing passage and arranging an NO<SB>2</SB>reduction catalyst at the downstream thereof. A catalyst consisting of P, Ir and SiO<SB>2</SB>as an NO<SB>2</SB>reduction catalyst is used when the exhaust gas does not contain SO<SB>2</SB>. A catalyst consisting of Ir and SiO<SB>2</SB>or P, Ir and SiO<SB>2</SB>as an NO reduction catalyst is used when the exhaust gas contains SO<SB>2</SB>. <P>COPYRIGHT: (C)2011,JPO&INPIT |
