摘要
以挥发性有机化合物(VOCs)的代表物质——甲苯为去除对象,采用自制线管式介质阻挡放电反应器,考察低温等离子体与γ-Al2O3负载不同类型催化剂相结合去除空气中甲苯的性能。通过对负载活性组分的γ-Al2O3小球与未负载进行对比分析,考察放电对催化活性的影响。对不同类型反应器从能量密度、甲苯去除效率、能量效率和副产物臭氧的产生量进行测定比较。研究结果表明,负载活性组分后,催化剂的比表面积和孔径均减小。与仅填充γ-Al2O3相比,负载催化剂后的反应器能量密度有所降低,填充负载锰银催化剂的反应器对甲苯的降解有明显的促进作用,但不同催化剂的作用程度不同,在电压17 k V时,MnO2、Ag O、MnO2-Ag O、MnO2-Ag O-CeO2催化剂及无负载催化剂对甲苯去除效率分别为53.4%、64.4%,67.9%、74.0%和53.3%。因此,活性组分有助于提高催化活性,进而提高甲苯去除效率。甲苯降解的能量效率随电压升高而减小,引入催化剂后的能量效率高于仅填充γ-Al2O3时的能量效率。臭氧的产生量随电压的升高而升高,引入催化剂有利于减少副产物臭氧的生成。
The removal of toluene by combination of non-thermal plasma over various γ-Al2 O3 supported catalysts was studied in a self-made wire-cylinder dielectric barrier discharge reactor. The effects of dis-charge on the catalytic activity of the catalysts was investigated by comparing γ-Al2 O3 support with and without active components. The specific energy density,toluene removal efficiency,energy efficiency and the concentration of by-product O3 for different reactors were also compared. The results showed that the specific surface area and pore diameter of the catalyst decreased after loading active components. Com-pared with γ-Al2 O3 ,the catalysts supported with active components could decrease the specific energy density of the reactor. MnO2-AgO supported catalysts could enhanced the toluene removal efficiency obvi-ously. For applied voltage being 17 kV,the toluene removal efficiency over MnO2 ,AgO,MnO2-AgO,and MnO2-AgO-CeO2 supported γ-Al2 O3 catalysts and γ-Al2 O3 were 53. 4% ,64. 4% ,67. 9% ,74. 0% and 53. 3% ,respectively. Therefore,the active components were helpful to improve the catalytic activity of the catalysts and toluene removal efficiency. Furthermore,the catalysts loaded with active components could enhance the energy efficiency for toluene degradation and reduce the formation of by-product ozone.
出处
《工业催化》
CAS
2015年第1期63-68,共6页
Industrial Catalysis
基金
国家自然科学基金(21307003)资助项目
