Abstract: Dielectric barrier discharge (DBD) plasma is used to co-catalyze the degradation of formaldehyde gas,and the effects of reaction conditions on the degradation efficiency of formaldehyde,the energy efficiency of reactor and the mass concentration of ozone formed are analyzed.The optimal reaction conditions are determined as follows:the initial concentration is 41.12 mg·m-3,the gas volume flow is 0.7 L·min-1,and the discharge power is 30 W.Under these conditions and over Mn-TiO2/γ-Al2O3 catalyst,the degradation efficiency of formaldehyde reaches as high as 90.71%,the energy efficiency of the reactor reaches 0.052 g·(kW·h)-1,while the mass concentration of O3 generated drops to 121.957 mg·m-3.
[1] Huang M,Li Y,Li M, et al .Active site directed tandem catalysis on single platinum nanoparticles for efficient and stable oxidation of formaldehyde at room temperature[J].Environmental Science and Technology,2019,53(7):3610-3619. [2] Wang W,Wang H,Zhu T, et al .Removal of gas phase low-concentration toluene over Mn,Ag and Ce modified HZSM-5 catalysts by periodical operation of adsorption and non-thermal plasma regeneration[J].Journal of Hazardous Materials,2015,292(15):70-78. [3] Xiao Z A,Br A,Yx A, et al .Catalytic oxidation of toluene in air using manganese incorporated catalyst by non-thermal plasma system[J].Separation and Purification Technology,2020,257:117973. [4] Najafpoor A A,Jonidi Ja Fa Ri A,Hosseinzadeh A, et al .Optimization of non-thermal plasma efficiency in the simultaneous elimination of benzene,toluene,ethyl-benzene,and xylene from polluted airstreams using response surface methodology[J].Environmental Science & Pollution Research,2018,25(1):233-241. [5] Jiang N,Lu N,Shang K, et al .Innovative approachfor benzene degradation using hybrid surface/packed-bed discharge[J].Plasmas Environ Sci Technol,2013,47(17):9898-9903. [6] Roland U,Holzer F,Kopinke F D.Improved oxidation of airpollutants in a non-thermal plasma[J].Catalysis Today,2002,73(3-4):315-323. [7] Zhu R,Mao Y,Jiang L, et al .Performance of chlorobenzene removal in a nonthermal plasma catalysis reactor and evaluation of its byproducts[J].Chemical Engineering Journal,2015,279:463-471. [8] Sudhakaran M S P,Trinh H Q,Karuppiah J, et al .Plasma catalytic removal of p-xylene from air stream using γ -Al2O3 supported manganese catalyst[J].Topics in Catalysis,2017,60(12/14):944-954. [9] Li Y,Fan Z,Shi J, et al .Post plasma-catalysis for VOCs degradation over different phase structure MnO2 catalysts[J].Chem Eng J,2015,241:251-258. [10] 赵亚飞,叶凯,庄烨,等.锰基催化剂协同等离子降解VOCs研究进展[J].化工进展,2020,39(S2):180-189. [11] 董冰岩,施志勇,何俊文,等.脉冲放电等离子体协同Mn/TiO2-分子筛,Fe/TiO2-分子筛,Cu/TiO2-分子筛催化剂降解甲醛[J].化工进展,2015,(9):3337-3344. [12] Naydenov A,Mehandjiev D.Complete oxidation of benzene on manganese dioxide by ozone[J].Appl Catal,1993,97:17-22. [13] Wang C,Ma J,Liu F, et al .The effects of Mn2+ precursors on the structure and czone decomposition activity of cryptomelane-type manganese oxide (OMS-2) catalysts[J].Phys Chem C,2015,119:23119-23126. [14] Yao X,Zhang J,Liang X, et al .Plasma-catalytic removal of toluene over the supported manganese oxides in DBD reactor:Effect of the structure of zeolites support[J].Chemosphere,2018,208:922-930. [15] 张琪,李茹,李秋怡,等.介质阻挡放电等离子体降解甲苯废气[J].西安工程大学学报,2018,32(1):62-66. [16] 董冰岩,甘青青,孙宇,等.高压脉冲放电协同复合型催化剂去除甲醛的实验[J].电工技术学报,2017,32(8):108-113. [17] 赵德志,丁天英,李小松,等.室温MnO<i>x 上O3氧化脱除空气中甲醛[J].催化学报,2012,33(3):396-401. [18] Kim H H,Ogata A,Futamura S, et al .Atmospheric plasma-driven catalysis for the low temperature decomposition of dilute aromatic compounds[J].Journal of Physics D Applied Physics,2015,38(8):1292-1300. [19] Chen J H,Davidson J H.Ozone production in the positive DC corona discharge:Model and comparison to experiments[J].Plasma Chemistry & Plasma Processing,22(4):495-522. [20] 宋志杰,徐浩军,魏小龙,等.低压氩气电感耦合等离子体特性分析及光谱诊断[J].光谱学与光谱分析,2019,39(4):1242-1246. [21] Sun M,Wu Y,Li J, et al .Diagnosis of OH radical by optical emission spectroscopy in atmospheric pressure unsaturated humid air corona discharge and its implication to desulphurization of flue gas[J].Plasma Chemistry & Plasma Processing,2005,25(1):31-40.