EXHAUST-GAS CONVERTING FILTER AND PRODUCTION PROCESS FOR THE SAME

摘要

An outlet-side catalytic layer 22 includes a noble metal in a concentration that is a noble-metal concentration in an inlet-side catalytic layer 20 or more, and the inlet-side catalytic layer 20 contains an NO x storage material in a content that is greater than that in the outlet-side catalytic layer 22 in the inlet-side catalytic layer 20, a pore catalytic layer 21 and the outlet-side catalytic layer 22. PM are converted on the inlet side mainly, and NO x are converted on the outlet side mainly. Therefore, the lowering of the noble metal' s activities is suppressed, and additionally it is possible to convert PM and NO x efficiently.