| abstract |
(57) Abstract: has a stably higher the NO x purification performance from a low temperature region to high temperature region, and the excellent exhaust gas purifying apparatus to sulfur poisoning resistance. A low-temperature NO x storage reduction catalyst comprising an oxide carrier carrying a noble metal and an alkaline earth metal or lanthanum 1 And a high-temperature NO x storage-reduction catalyst 2 having a lower layer 21 carrying a noble metal and an alkali metal on a basic oxide carrier and a sulfur trapping layer 22 formed on the surface thereof, and upstream of the exhaust gas flow. The low-temperature NO x storage-reduction catalyst 1 was disposed on the side, and the high-temperature NO x storage-reduction catalyst 2 was disposed downstream thereof. The high temperature lean atmosphere, since SO x is trapped in the sulfur capture layer 22, the sulfur poisoning of the NO x storage material is supported on the lower layer 21 is suppressed. |