Exhaust gas treatment from diesel engine using ceramic filter-a development of simultaneous treatment technique of particulate material and gas pollutant by SPCP-

表面电晕放电诱导等离子体化学过程（Surface corona discharge induced Plasma Chemical Process，简称SPCP）是一种利用表面放电中的自由基引发多种化学反应的方法。在这项研究中，建立了一个特殊的和新颖的反应器设计。这是SPCP和陶瓷过滤器的混合体，并且在陶瓷过滤器的表面上可以产生表面放电。利用该系统进行了瓦斯处理试验。作为样品，使用包括颗粒物（碳烟）的丁烷不完全燃烧气体和硝酸盐氧化物标准样品，它们是柴油机排气的模型气体。样品气中的烟灰被陶瓷过滤器完全过滤。此外，当SPCP施加在沉淀的烟灰上时，它在陶瓷过滤器上的表面放电中被氧化和去除。实验结果表明，该复合系统能够有效地过滤和去除烟尘。另一方面，氮氧化物也被还原和去除的表面放电电晕。在这些反应中，一个是氧化，另一个是还原。当同时施加这些载荷时，证实了反应同时进行，并且表明该过程是互补的。此外，该系统还应用于三氯乙烯的处理。经确认，三氯乙烯被成功去除。在该系统中，经处理的气体通过陶瓷过滤器和在过滤器表面上产生的等离子体区域，因此，经处理的气体和放电电晕之间的接触效率提高，并且这导致了良好的反应活化效率。

SPCP (Surface corona discharge induced Plasma Chemical Process) is a method which can activate many kinds of chemical reaction due to radicals in a so-called surface discharge. In this study, a special and novel reactor design was established. This is a hybrid of the SPCP and a ceramic filter, and on the surface of the ceramic filter a surface discharge can be generated. By using this system, gas treatment was tested. As a sample, imperfect combustion gas from butane including particulate material (soot) and standard sample of nitrate oxide, which were model gases of exhaust gas from diesel engine, were applied. The soot in the sample gas was completely filtered by the ceramic filter. Also, when SPCP was applied on the precipitated soot, it was oxidized and removed in the surface discharge on the ceramic filter. It was confirmed that the hybrid system constructed here performed successfully for the soot filtration and removal. On the other hand, nitrogen oxide was also reduced and removed in the surface discharge corona. In these reactions, one is a oxidation and the other is a reduction. When these loads are applied simultaneously, it was confirmed that the reactions progressed simultaneously, ant it was suggested the process is complementary. Besides, the system was applied also for a treatment of trichioroethylene. It was confirmed that trichloroethylene was removed successfully. In this system, treated gas passes through the ceramic filter and the plasma region which is generated on the surface of the filter, therefore a contact efficiency between the treated gas and discharge corona and this results in a good efficiency of the reaction activated.