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Investigation of Soot Oxidation Carried out on Membrane Filters Composed of SiC Nanoparticles
- Keisuke Nakamura - Graduate School of Tokyo Institute of Technology ,
- Hiroshi Oki - Graduate School of Tokyo Institute of Technology ,
- Ryoko Sanui - Graduate School of Tokyo Institute of Technology ,
- Yutaro Kinoshita - Graduate School of Tokyo Institute of Technology ,
- Nobuhiro Hidaka - Sumitomo Osaka Cement Co., Ltd. ,
- Masamichi Tanaka - Sumitomo Osaka Cement Co., Ltd. ,
- Hiroaki Matsumoto - Hitachi High-Technologies Corporation ,
- Katsunori Hanamura - Tokyo Institute of Technology
ISSN: 1946-3936, e-ISSN: 1946-3944
Published September 01, 2015 by SAE International in United States
Citation: Nakamura, K., Oki, H., Sanui, R., Kinoshita, Y. et al., "Investigation of Soot Oxidation Carried out on Membrane Filters Composed of SiC Nanoparticles," SAE Int. J. Engines 9(1):297-304, 2016, https://doi.org/10.4271/2015-01-2015.
The diesel particulate membrane filter (DPMF) is a good solution to the problem of high pressure drop that exists across diesel particulate filters (DPFs) as a result of the soot trapping process. Moreover, DPMFs that have a membrane layer composed of SiC nanoparticles can reduce the oxidation temperature of soot and the apparent activation energy. The SiC nanoparticles have an oxide layer on their surface, with a thickness less than 10 nm. From the visualization of soot oxidation on the surface of SiC nanoparticles by an environmental transmission electron microscope (ETEM), soot oxidation is seen to occur at the interface between the soot and oxide layers. The soot oxidation temperature dependency of the contact area between soot and SiC nanoparticles was evaluated using a temperature programmed reactor (TPR). The contact area between soot and SiC nanoparticles was varied by changing the ratio of SiC nanoparticles and carbon black (CB), which was used as an alternative to soot. If the contact area between CB and SiC nanoparticles was large enough, CB oxidation temperatures were almost the same whether Pt was embedded in the oxide layer or not. Furthermore, the CB oxidation temperature was found to depend on the oxygen concentration in the gas phase. Pt helped increase the amount of adsorbed oxygen on the surface of SiC nanoparticles.