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《Chinese Journal of Catalysis》 2005-09
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NO_x Removal in Catalyst-Pellet-Filled Dielectric Barrier Discharge Plasma with Methane Additive

NIU Jinhai, ZHU Aimin*, SHI Chuan, SHI Lingling, SONG Zhimin, XU Yong ( Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian 116024, Liaoning , China)  
In the In/HZSM-5 catalyst-pellet-filled dielectric barrier discharge reactor, the NOx removal with methane additive and its products were investigated. At 200~350 ℃, in the process of plasma with In/HZSM-5 catalyst, the NOx conversion was much higher than that in the process of plasma alone or In/HZS M-5 catalyst alone. Under the reaction conditions of 0.03%NO-0.05%CH 4-2%O2-97.92%N2, GHSV=7?200 h -1 and θ=300 ℃, the NOx conversion for pure plasma induced, pure catalyst induced and plasma-catalys t induced reactions was 24%, 25% and 65%, respectively. No nitrate salt or nitri te salt was observed on the catalyst surface. N2O as a by-product was onl y formed in minority. Thereby, it was inferred that N2 was the major product in the plasma-catalyst induced NOx removal with methane additive. At belo w 300 ℃, the NOx removal proceeded mainly via decomposition pathway a nd methane played an important role in restraining NOx formation. At 300~ 350 ℃, methane could be activated by the synergetic effect of plasma and In/HZS M-5 catalyst and reacted as a reductant, which led to NOx removal via reduction pathway. Using such a catalyst-pellet-filled dielectric barrier dis charge reactor, NOx could be removed in a very broad temperature range (fo r low temperature zone by plasma-catalyst; for high temperature zone by catalys t alone).
【Fund】: 国家高技术研究发展计划(863计划)(2002AA649140);; 国家自然科学基金(20077005);; 辽宁省科学技术基金(20022112)资助项目.
【CateGory Index】: X701.3
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