DDBD协同MnO_x催化氧化降解低浓度甲苯
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摘要
采用DDBD协同不同前驱物制备MnO_x氧化降解低浓度甲苯,考察催化前驱物对甲苯降解、O_3和NO_x产量的影响。结果表明:特定输入能量为25 J/L时,仅采用DDBD对甲苯降解效率最高可达50. 7%,且产生O_3、NO和NO_2等副产物; MnO_x催化氧化能力为MnO_x(MA)>MnO_x(MS);其中,采用DDBD-15%MnO_x(MA)降解甲苯时最大去除率为97. 5%,NO和NO_2最大去除率分别为80. 0%和43. 7%,CO_x选择性最大值为73. 4%,在尾气中仅有少量的O_3被检测到。
DDBD combined with MnO_x prepared by different precursors was used to oxidize duile toluene. The effects of catalytic precursors on toluene degradation,ozone and nitrogen oxiden were investigated. The results showed that when the SIE was 25 J/L,the degradation efficiency of DDBD was up to 50. 7%,while the by-products such as O_3,NO and NO_2 were generated.The catalytic oxidation capacity of MnO_x was by the order of MnO_x ( MA) >MnO_x( MS); the maximum removal rate of toluene was 97. 5% in the DDBD-15% MnO_x ( MA) system; the maximum removal rates of NO and NO_2 were 80. 0% and 43. 7%,respectively; and the maximum selectivity of CO_x was 73. 4%. Moreover,trace amount of ozone was detected in the tail gas.
DDBD combined with MnO_x prepared by different precursors was used to oxidize duile toluene. The effects of catalytic precursors on toluene degradation,ozone and nitrogen oxiden were investigated. The results showed that when the SIE was 25 J/L,the degradation efficiency of DDBD was up to 50. 7%,while the by-products such as O_3,NO and NO_2 were generated.The catalytic oxidation capacity of MnO_x was by the order of MnO_x ( MA) >MnO_x( MS); the maximum removal rate of toluene was 97. 5% in the DDBD-15% MnO_x ( MA) system; the maximum removal rates of NO and NO_2 were 80. 0% and 43. 7%,respectively; and the maximum selectivity of CO_x was 73. 4%. Moreover,trace amount of ozone was detected in the tail gas.
引文
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[2] Hu J,Jiang N,Li J,et al. Discharge characteristics of series surface/packed-bed discharge reactor driven by Bipolar Pulsed Power[J]. Plasma Science and Technology,2016,18:254-258.
[3] Guo T,Li X S,Li J Q,et al. On-line quantification and human health risk assessment of organic by-products from the removal of toluene in air using non-thermal plasma[J]. Chemosphere,2018,194:139-146.
[4] Abbas H F, Daud W W. Hydrogen production by methane decomposition:a review[J]. International Journal of Hydrogen Energy,2010,35:1160-1190.
[5] Schiavon M,Scqpinello M,Tosi P,et al. Potential of non-thermal plasmas for helping the biodegradation of volatile organic compounds(VOCs)released by waste management plants[J].Journal of Cleaner Production,2015,104:211-219.
[6]闫克平，李树然，冯卫强，等．高电压环境工程应用研究关键技术问题分析及展望[J]．高电压技术，2015,41(8):2025-2544.
[7]竹涛，和娴娴，陈锐，等．低温等离子体反应器去除挥发性有机化合物的能效分析[J]．高电压技术，40(10):2986-2990.
[8] Mustafa M F,Fu X D,Liu Y J,et al. Volatile organic compounds(VOCs)removal in non-thermal plasma double dielectric barrier discharge reactor[J]. Journal of Hazardous Materials,2018,347:317-324.
[9]姚水良，毛灵爱，张霞，等．等离子体复合微量贵金属催化反应器催化氧化苯的机理分析[J]．高电压技术，2017,43(12):3973-3980.
[10] Chang T,Shen Z X,Huang Y,et al. Post-plasma-catalytic removal of toluene using MnO2-Co3O4catalysts and their synergistic mechanism[J]. Chemical Engineering Journal,2018,348:15-25.
[11] Fan X,Zhu T L,Wang M Y,et al. Removal of low-concentration BTX in air using a combined plasma catalysis system[J].Chemosphere,2009,75(10):1301-1306.
[12] Bo Z,Hao H,Yang S L,et al. Vertically-oriented graphenes supported Mn3O4as advanced catalysts in post plasma-catalysis for toluene decomposition[J]. Applied Surface Science,2018,436:570-578.
[13] Dhandapani B, Dyama S T. Gas phase ozone decomposition catalysts[J]. Applied Catalysis B:Environmental,1997,11:129-166.
[14] Yu Q J,Gao Y M,Tang X L,et al. Removal of NO from flue gas over HZSM-5 by a cycling adsorption-plasma process[J]. Catalysis Communications,2018,110:18-22.
[15] Rezaei E,Soltan J. Low temperature oxidation of toluene by ozone over MnOx/γ-alumina and MnOx/MCM-41 catalysts[J]. Chemical Engineering Journal,2012,198/199:482-490.
[16]朱利安R.H．罗斯．多相催化:基本原理与应用[M]．田野，张立红，赵宜成，等译．北京:化学工业出版，2015:70-75.
[17] Tang X F,Li Y G,Huang X M,et al. MnOx-CeO2mixed oxide catalysts for complete oxidation of formaldehyde:Effect of preparation method and calcination temperature[J]. Applied Catalysis B:Environmental,2006,62(3/4):265-273.
[18] Zhang C,Liu F,Zhai F,et al. Alkali-metal-promoted Pt/Ti O2opens a more efficient pathway to formaldehyde oxidation at ambient temperatures[J]. Angewandte Chemie International Edition,2012,51(38):9628-9632.
[19] Pangilinan C D C,Kurnianwan W,Hinode H. Effect of MnOx/Ti O2oxidation state on ozone concentration in a nonthermal plasmadriven catalysis reactor[J]. Ozone Science and Engineering,2016,38(2):156-162.
[20] Wang L,He H,Zhang C B,et al. Effects of precursors for manganese-loadedγ-Al2O3catalysts on plasma-catalytic removal of o-xylene[J]. Chemical Engineering Journal,2016,288:406-413.
[21] Liu Y N,Braci L,Cavadias S,et al. Post-discharge treatment of air effluents polluted by butyl-mercaptan:the role of nitrate radical[J]. Journal of Physics D:Applied Physics,2011,44(9):8.
[22] Subrahmanyam C,Renken A,Kiwi-Minsker L. Novel catalytic non-thermal plasma reactor for the abatement of VOCs[J]. Chemistry Engineering Journal,2007,134(1):78-83.
[23] Rezaei E,Soltan J,Chen N,et al. Catalytic oxidation of toluene by ozone ove alumina supported manganese oxides:effect of catalyst loading[J]. Applied Catalysis B:Environment,2013,136/137(3):239-247.