| 摘要 |
Anoblemetal is supportedonanupstream-sidecatalyticportion 20 at least, and an SO x storage material, such as Mg and K that lower the noble metal's activities, is supported on a downstream-side catalytic portion 21. The noble metal being supported on the upstream-side catalytic portion 20 oxidizes SO 2 efficiently to turn it into SO x , because the lowering of oxidizing activities is suppressed. These SO x are retained by means of storage in the SO x storage material being loaded on the downstream-side catalytic portion 21. Therefore, the SO x storing performance improves, and it is good in terms of durability as well. |
