Abstract
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 CeO2–Ag CDPF reduces the PM oxidation temperature by approximately 100 °C when compared with a CDPF with a Pt/Al2O3 catalyst or a bare diesel particulate filter. The catalytic performance of the CeO2–Ag CDPF decreases in the presence of ash. However, this decrease is observed until the ash reaches 40 g/L in weight or 100 μm in thickness. An electron spin resonance analysis suggests that this remote PM oxidation is caused by the migration of superoxide species generated by the CeO2–Ag catalyst.
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Yamazaki, K., Sakakibara, Y., Daido, S. et al. Particulate Matter Oxidation over Ash-Deposited Catalyzed Diesel Particulate Filters. Top Catal 59, 1076–1082 (2016). https://doi.org/10.1007/s11244-016-0594-y
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DOI: https://doi.org/10.1007/s11244-016-0594-y