Study on PM Oxidation over Ash-deposited Catalyzed Diesel Particulate Filters

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  • アッシュ堆積時における触媒付ディーゼル微粒子捕集フィルター上の PM 酸化挙動解析
  • アッシュ タイセキジ ニ オケル ショクバイ ツキ ディーゼル ビリュウシホシュウ フィルター ジョウ ノ PM サンカ キョドウ カイセキ

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Abstract

The PM oxidation behavior over ash-deposited catalyzed diesel particulate filters (CDPFs) was studied by using small-scale evaluation and visualization techniques. Before ash deposition, a CDPF with CeO2–Ag (CA) catalyst reduced the temperature required for PM oxidation by about 100 °C compared to a CDPF with Pt/Al2O3 catalyst or to a DPF alone. The catalytic performance of the CDPF with CA was decreased by ash deposition, however, it was observed until ash deposition reached 40g/L by weight or 100 μm by thickness. ESR analysis suggested that this remote PM oxidation could be due to migration of superoxide species generated on the CA catalyst.

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