等离子体作用下复合催化剂处理有机废气的研究

发布时间：2018-05-22 11:48

  本文选题：低温等离子体 + 催化　； 参考：《武汉工程大学》2015年硕士论文

【摘要】：挥发性有机化合物(VOCs)的排放量逐年增加,对环境造成了严重污染。低温等离子体处理VOCs效率高、适用范围广。而单一低温等离子体技术有着能耗高和副产物多等缺点,而低温等离子体协同催化技术有着去除率高、CO_2选择性好及产生二次污染物少等优点。本文在查阅大量文献的基础上,分析了等离子体协同催化剂处理VOCs的反应机制,并对催化剂存在的问题进行了探讨。本论文主体共分为四个部分:(1)采用单独等离子体放电降解苯的有机废气,测试苯的初始浓度、气体流速、放电功率对苯的降解率效果的影响。为后续实验提供对照。(2)采用水热法制备α-MnO_2和β-MnO_2催化剂,实验结果表明,β-MnO_2催化剂结合等离子体催化降解苯的效果更佳,功率为36W时,尾气中臭氧含量下降72.5%;苯的降解率为64.1%。(3)以β-MnO_2为基础,利用浸渍法制备了CuMnO_x催化剂,应用SEM、XRD、XPS、N_2吸附-脱附等方法对催化剂进行了表征;利用PDC式反应器探讨了苯降解的效果;探讨了反应条件(初始浓度、流速、功率)、催化剂种类、以及焙烧温度对苯降解的影响,并且制定出了复合催化剂的最佳制备条件。实验结果表明,铜锰摩尔比为1:4,焙烧温度500℃,焙烧4h时催化性能最好。功率为36W时,尾气中臭氧含量降低80.0%;苯的降解率可达到72.3%。(4)以β-MnO_2为基础,利用浸渍法制备FeMnO_x催化剂,与CuMnO_x催化剂相比,FeMnO_x催化剂的活性较好,铁锰摩尔比为1:3,焙烧温度600℃,焙烧4h时催化性能最好。功率为36W时尾气中臭氧含量降低82.5%;苯的降解率可达74.5%。
[Abstract]:The emission of volatile organic compounds (VOCs) increased year by year, which caused serious pollution to the environment. Low temperature plasma treatment of VOCs has high efficiency and wide application range. The single low temperature plasma technology has the disadvantages of high energy consumption and more by-products, while the low temperature plasma co-catalytic technology has the advantages of high removal efficiency, good selectivity and less secondary pollutants. Based on a large number of literatures, the mechanism of plasma synergistic catalyst for VOCs treatment is analyzed, and the existing problems of the catalyst are discussed. The main body of this thesis is divided into four parts: 1) the effect of the initial concentration of benzene, gas flow rate and discharge power on the degradation efficiency of benzene was measured by using the single plasma discharge to degrade the organic waste gas of benzene. 伪 -MnO _ 2 and 尾 -MnO _ 2 catalysts were prepared by hydrothermal method. The results showed that 尾 -MnO _ 2 catalyst combined with plasma was better for the degradation of benzene, and the power was 36W. On the basis of 尾 -MnO-2, CuMnO_x catalyst was prepared by impregnation method, and characterized by SEMXRDD-XPSS-N2 adsorption-desorption method, the effect of benzene degradation was discussed by PDC reactor. The effects of reaction conditions (initial concentration, flow rate, power, type of catalyst and calcination temperature on the degradation of benzene) were discussed. The experimental results show that the best catalytic performance is obtained when the molar ratio of copper and manganese is 1: 4, the calcination temperature is 500 鈩，

本文编号：1921929