介质阻挡放电对碳烟催化氧化的强化教材.docx

PAGE \* MERGEFORMATI 本科毕业设计（论文） 题目：介质阻挡放电对碳烟催化 氧化的强化研究 摘 要 当前，柴油机动车以其良好的动力性和经济性等优势而受到世界各国的广泛关注，但其排气中的污染物尤其是碳烟颗粒物（PM）严重污染了城市环境。颗粒物过滤器（DPF）技术广泛地应用于柴油车尾气净化装置中，而高效可再生催化剂是其中的关键技术。MnOx-CeO2复合氧化物催化剂具有良好的结构稳定性和低温催化活性而成为研究热点。另外，介质阻挡放电产生等离子体能产生大量活性因子，强化碳烟的催化氧化。 本实验以柠檬酸络合法制备MnOx-CeO2系列催化剂，通过TPO、BET、XRD、H2-TPR、O2-TPD等手段对催化剂进行测试和表征，用于探讨催化剂特性与碳烟氧化活性的关联。并且重点研究等离子体对MnOx-CeO2氧化碳烟燃烧得强化效应。 经过研究得到以下主要结论： （1）用柠檬酸络合燃烧法将Mn引入CeO2后，MnOx-CeO2催化剂形成了具有立方相萤石结构固溶体，氧化还原性能提高，同时促生了比CeO2更多的氧空位，有利于气相氧在催化剂表面上的吸附、活化和迁移，催化剂表面生成丰富的氧物种(O2-，O-，O2-)。TPO活性评价结果表明，MnOx(0.4)-CeO2在复合氧化物中拥有最佳活性。 （2）引入等离子体后，MnOx-CeO2催化剂氧化碳烟的活性得到一定的提高，且去除效率计算值大大提升，有效地消除了催化剂表面的碳烟残留现象。 关键词：碳烟氧化；MnOx-CeO2；介质阻挡放电；等离子体；强化作用 Abstract Nowadays , diesel motor vehicles are widely used in many countries all over the world for their special advantages , however , serious environmental impact are brought out because of pollutants especial soot from exhaust . Diesel Particulat Filter (DPF) is widely applied for soot elimination , with the efficient and reproducible catalyst become the key factor . With stable structure and low temperature catalytic activity , the MnOx-CeO2 catalysts become the popular issue . What is more , Plasma based on Dielectric Barrier Discharge(DBD) , with a lot of activating factor ,enhanceing on the oxidation of soot . Based on these points, A series of MnOx-CeO2 catalysts were prepared from Citric acid complex combustion(L) in this paper. Temperature Programmed Oxidation (TPO), specific surface area (BET), X-Ray diffraction (XRD), Temperature Programmed Reduction (H2--TPR), Temperature Programmed Desorption (O2-TPD), were used to test and determine the catalysts, which are used to study the correlation between catalyst features and soot oxidation activity. What is more, promoting effect of plasma of Catalyst for Soot Combustion, is mainly discussed. The main conclusion were concluded after the study: With Mn introduced into CeO2 by Citric acid complex combustion method, MnOx-CeO2 still has formed a cubic