Abstract
Particulate matter (PM) trapping and oxidation in regeneration on the surface of a diesel particulate membrane filter (DPMFs) were investigated in detail using an all-in-focus optical microscope. The DPMF consists of two-layer sintered filters, where a SiC-nanoparticle membrane (made from a mixture of 80 nm and 500 nm powders) covers the surface of a conventional SiC filter. Through a visualization experiment, it was shown that PMs were trapped homogeneously along fine surface pores of the membrane's top surface, whereas in the regeneration process, the particulates in contact with the membrane may have been oxidized with some catalytic effect of the SiC-nanoparticles. The oxidation temperature of particulate trapped on the SiC-nanoparticle membrane was lower than that on the conventional diesel particulate filters (DPFs) without a rare-metal catalyst. The activation energy of reaction on the nanoparticle membrane became lower than that on the conventional SiC-DPF without catalyst. Consequently, the SiC-nanoparticles membrane filters had some catalytic activity similar to that of the conventional catalyst DPF.
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