Oxidation behavior of particulate matter (PM) in catalyzed diesel particulate filters (CDPFs) was investigated in the presence of ash through small-scale catalytic performance evaluation and visualization measurement. In the absence of ash, a CeO 2 -Ag CDPF reduces the PM oxidation temperature by approximately 100°C when compared with a CDPF with a Pt/Al 2 O 3 catalyst or a bare diesel particulate filter. The catalytic performance of the CeO 2 -Ag CDPF decreases in the presence of ash. However, this decrease is observed until the ash reaches 40 g/L in weight or 100 lm in thickness. An electron spin resonance analysis suggests that this remote PM oxidation is caused by the migration of superoxide species generated by the CeO 2 -Ag catalyst.
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