DBD等离子体协同Mn-TiO2/γ-Al2O3催化剂降解二甲苯

李茹; 李晓康; 冯燕; 王雪艳; 邢倩云

doi:10.13205/j.hjgc.202404019

DBD等离子体协同Mn-TiO₂/γ-Al₂O₃催化剂降解二甲苯

doi: 10.13205/j.hjgc.202404019

西安工程大学环境与化学工程学院,西安 710048

基金项目:

国家自然科学基金项目(11105102)

详细信息

作者简介:
李茹(1972-),女,教授,主要研究方向为环境污染控制及资源化技术。xjliru@163.com

计量
- 文章访问数: 55
- HTML全文浏览量: 7
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2023-04-07
- 网络出版日期: 2024-06-01

DEGRADATION OF XYLENE BY DBD PLASMA IN COLLABORATION WITH Mn-TiO₂/γ-Al₂O₃ CATALYST

School of Environmental Science and Chemical Engineering, Xi’an Polytechnic University,Xi’an 710048, China

摘要

摘要: 采用浸渍法制备Mn-TiO₂/γ-Al₂O₃催化剂,协同介质阻挡放电(DBD)等离子体降解二甲苯。探究了不同放电功率、初始质量浓度、气体流量下DBD等离子体对二甲苯的氧化性能;利用XRD和FT-IR对催化剂进行表征,以分析DBD等离子体放电前后催化剂的晶型与性能。结果表明:在放电功率为20 W,二甲苯进气浓度为38.62 mg/m³,进气流量为0.65 L/min条件下,协同Mn-TiO₂/γ-Al₂O₃催化剂后,二甲苯降解率达到75.8%,反应器的能效为0.1027 g/(kW·h),同时O₃浓度降低至36.94 mg/m³。表征结果显示,DBD等离子体放电前后未改变催化剂晶型与性能。为进一步分析降解二甲苯过程中产生的中间产物,通过FT-IR、GC-MS及发射光谱法进行诊断,发现加入催化剂后中间产物的种类和数量减少、发射光谱强度增强、特征谱线的数量增多。研究结果可为DBD等离子体在降解二甲苯应用中的性能优化和催化剂的选择提供理论参考。
- DBD等离子体 /
- 二甲苯 /
- 催化剂 /
- 等离子体诊断
Abstract: In this study, Mn-TiO₂/γ-Al₂O₃ catalyst was prepared by impregnation method to degrade xylene with dielectric barrier discharge (DBD) plasma. The oxidation properties of xylene in DBD plasma under different discharge power, initial mass concentration, and gas flow were studied. The catalyst was characterized by XRD and FT-IR to analyze the crystal shape and properties of the catalyst before and after DBD plasma discharge. The results showed that under the conditions of discharge power of 20 W, inlet concentration of xylene 38.62 mg/m³ and inlet flow rate of 0.65 L/min, the degradation efficiency of xylene reached 75.8% and the energy efficiency of the reactor was 0.1027 g/(kW·h) after adding Mn-TiO₂/γ-Al₂O₃ catalyst. At the same time, ozone concentration was reduced to 36.94 mg/m³. The characterization results showed that the crystal shape and properties of the catalyst were not changed before and after the DBD plasma discharge. To further analyze the intermediate products produced in the process of degradation of xylene, FT-IR, GC-MS, and emission spectroscopy were used for diagnosis. It was found that the types and quantity of intermediate products decreased, the emission spectral intensity increased, and the number of characteristic spectral lines increased after adding catalyst. This study can provide a theoretical reference for the performance optimization and catalyst selection of DBD plasma in the application of xylene degradation.
- DBD plasma /
- xylene /
- catalyst /
- plasma diagnosis

HTML全文

参考文献(27)

[1]	LIU R, WU H, SHI J H, et al. Recent progress on catalysts for catalytic oxidation of volatile organic compounds: a review[J]. Catalysis Science & Technology, 2022, 12(23): 6945-6991.
[2]	DAVIDSON C J, HANNIGAN J H, BOWEN S E. Effects of inhaled combined benzene, toluene, ethylbenzene, and xylenes (BTEX): toward an environmental exposure model[J]. Environmental toxicology and pharmacology, 2021, 81: 103518.
[3]	LIU B S, YANG Y, YANG T, et al. Effect of photochemical losses of ambient volatile organic compounds on their source apportionment[J]. Environment International, 2023,172: 107766.
[4]	YU B, YUAN Z, YU Z, et al. BTEX in the environment: an update on sources, fate, distribution, pretreatment, analysis, and removal techniques[J]. Chemical Engineering Journal, 2022,435(Part1): 134825.
[5]	MU Y B, WILLIAMS P T. Recent advances in the abatement of volatile organic compounds (VOCs) and chlorinated-VOCs by non-thermal plasma technology: a review[J]. Chemosphere, 2022,308(Part3): 136481.
[6]	LU W J, ABBAS Y, MUSTAFA M F, et al. A review on application of dielectric barrier discharge plasma technology on the abatement of volatile organic compounds[J]. Frontiers of Environmental Science & Engineering, 2019, 13(2): 1-19.
[7]	LI S J, DANG X Q, YU X, et al. The application of dielectric barrier discharge non-thermal plasma in VOCs abatement: a review[J]. Chemical Engineering Journal, 2020, 388: 124275.
[8]	PANDA P, MAHANTA R K, MOHANTY S, et al. Abatement of gas-phase VOCs via dielectric barrier discharge plasmas[J]. Environmental Science and Pollution Research, 2021, 28: 28666-28679.
[9]	ZHANG H, LI K, SUN T, et al. The removal of styrene using a dielectric barrier discharge (DBD) reactor and the analysis of the by-products and intermediates[J]. Research on Chemical Intermediates, 2013, 39(3): 1021-1035.
[10]	刘鑫. 低温等离子体催化协同降解混合VOCs(甲苯、丙酮及乙酸乙酯)的研究[D]. 上海:东华大学, 2022.
[11]	郑毅文. 介质阻挡放电协同催化降解邻二氯苯的实验研究[D]. 杭州:浙江大学, 2021.
[12]	LIU Z, ZHANG Y, JIANG S, et al. Enhanced catalytic performance and reduced by-products emission on plasma catalytic oxidation of high-concentration toluene using Mn-Fe/rGO catalysts[J]. Journal of Environmental Chemical Engineering, 2022, 10(6): 108770.
[13]	YANG J, LIU S Y, HE T Y, et al. Degradation of toluene by DBD plasma-catalytic method with Mn_<em>xCo_<em>yCe_<em>zO_<em>n catalysts: characterization of catalyst, catalytic activity and continuous test[J]. Journal of Environmental Chemical Engineering, 2021, 9(6): 106361.
[14]	LYU Y, LI C T, DU X Y, et al. Catalytic removal of toluene over manganese oxide-based catalysts: a review[J]. Environmental Science and Pollution Research, 2020, 27: 2482-2501.
[15]	CHANG T, MA C L, SHEN Z X, et al. Mn-based catalysts for post non-thermal plasma catalytic abatement of VOCs: a review on experiments, simulations and modeling[J]. Plasma Chemistry and Plasma Processing, 2021, 41(5): 1239-1278.
[16]	DONG S L, WANG Y F, YANG J, et al. Performance and mechanism analysis of degradation of toluene by DBD plasma-catalytic method with MnO_<em>x/Al₂O₃ catalyst[J]. Fuel, 2022, 319: 123721.
[17]	JIANG L Y, WANG P J, ZHANG Y F, et al. Plasma-catalytic oxidation of chlorobenzene over Co-Mn/TiO₂ catalyst in a dielectric barrier discharge reactor with the segmented electrodes[J]. Journal of Environmental Chemical Engineering, 2022, 10(4): 108021.
[18]	姜理英, 张瑜芬, 胡俊,等. NTP协同双金属锰基催化剂降解氯苯的性能研究[J]. 环境科学学报, 2021, 41(3): 922-931.
[19]	AYUB K S, ZAMAN W Q, MIRAN W, et, al. Efficient post-plasma catalytic degradation of toluene via series of Co-Cu/TiO₂ catalysts[J]. 2022, 8(48): 4227-4248.
[20]	LI W J, GU Z Y, TENG F H, et al. The synergetic effect of UV rays on the decomposition of xylene in dielectric barrier discharge plasma and photocatalyst process[J]. The European Physical Journal Applied Physics, 2018, 81(2): 20801.
[21]	WU Z L, ZHOU W L, ZHU Z B, et al. Enhanced oxidation of xylene using plasma activation of an Mn/Al₂O₃ catalyst[J]. IEEE Transactions on Plasma Science, 2020, 48(1): 163-172.
[22]	DONG S L, WANG Y F, YANG J, et al. Performance and mechanism analysis of degradation of toluene by DBD plasma-catalytic method with MnO_<em>x/Al₂O₃ catalyst[J]. Fuel, 2022, 319: 123721.
[23]	ZENG X L, LI B, LIU R Q, et al. Investigation of promotion effect of Cu doped MnO₂ catalysts on ketone-type VOCs degradation in a one-stage plasma-catalysis system[J]. Chemical Engineering Journal, 2020, 384: 123362.
[24]	石秀娟, 梁文俊, 尹国彬, 等. 低温等离子体协同Mn基催化剂降解氯苯研究[J]. 化工学报, 2022, 73(10): 4472-4483.
[25]	张益坤, 姚鑫, 陈铭夏, 等. 低温等离子体除苯过程中臭氧的演变与作用[J]. 工业催化, 2020, 28(4): 68-72.
[26]	韩丰磊, 季纯洁, 张子琦, 等. 低温等离子体协同催化技术处理VOCs研究综述[J]. Clean Coal Technology, 2022, 28(2): 23-31.
[27]	LIU P F, HE L M, ZHAO B B. Discharge and optical emission spectrum characteristics of a coaxial dielectric barrier discharge plasma-assisted combustion actuator[J]. Journal of Spectroscopy, 2020, 2020: 6034848.