催化剂协同介质阻挡放电等离子体对不同VOCs的催化选择性  

Catalytic selectivity of catalyst in the degradation of mixed VOCs by dielectric barrier discharge plasma

作　　者：刘鑫[1] 刘建奇[1] 陈佳尧 钟方川[2,3] LIU Xin;LIU Jianqi;CHEN Jiayao;ZHONG Fangchuan(College of environmental science and engineering,Donghua University,Shanghai 201620;College of science,Donghua University,Shanghai 201620;Magnetic confinement fusion research center of the Ministry of education,Ministry of education,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]东华大学理学院,上海201620 [3]教育部磁约束核聚变研究中心,东华大学,上海201620

出　　处：《环境工程学报》2022年第6期1862-1871,共10页Chinese Journal of Environmental Engineering

基　　金：中央高校基本科研业务费专项资金(2232021G-10)。

摘　　要：为考察混合气体中各组分对VOCs降解的影响,以及催化剂在协同低温等离子体降解多组分VOCs气体中的表现,选取甲苯、丙酮及乙酸乙酯组成混合VOCs进行低温等离子体降解,进而研究混合降解方式对混合VOCs气体各组分降解效果的影响。先制备了Mn_(2)O_(3)/γ-Al_(2)O_(3)催化剂,采用催化剂后置方式研究催化剂在协同低温等离子体降解多组分混合VOCs气体过程中的表现。结果表明:多组分混合VOCs降解时,甲苯和乙酸乙酯的降解率相较单独降解时都有所提升,当特定输入能量(SIE)为700 J·L^(-1)时,提升率分别为69.1%和12.64%,而丙酮的降解率相较单独降解时却发生了明显下降,下降了40.74%;多组分混合VOCs降解时的臭氧产量相较3种VOCs单独降解时均有微弱下降;多组分混合VOCs相较单种VOCs降解时的碳平衡均略有下降;在协同低温等离子体降解多组分VOCs气体过程中,Mn_(2)O_(3)/γ-Al_(2)O_(3)催化剂对混合VOCs中甲苯、乙酸乙酯及丙酮降解率有明显提升,且随VOCs降解难度的上升而更加明显,并使得各条件下VOCs降解的碳平衡均得到了提升。本研究结果可为低温等离子体降解VOCs的实际应用提供参考。At present,there are few studies on the catalytic degradation of multi-component VOCs.The effect of gas component mixing on the degradation of each component is still unclear.The performance of the catalyst in the synergistic degradation of multi-component VOCs by non-thermal plasma also needs to be further studied.In this paper,the mixed VOCs composed of toluene,acetone and ethyl acetate were degraded by non-thermal plasma to investigate the degradation of each component in multi-component VOCs.Mn_(2)O_(3)/γ-Al_(2)O_(3) catalyst was prepared,and the post catalyst method was applied to study the performance of the catalyst in the process of synergistic non-thermal plasma degradation of multi-component VOCs.The results showed that:1) compared with single VOCs,the degradation rates of toluene and ethyl acetate in the degradation of mixed VOCs were higher than those in the degradation of pure toluene or ethyl acetate.When SIE was 700 J·L^(-1),the enhancement rates were 69.1% and 12.64% respectively,while the degradation rate of acetone decreased significantly by40.74%;2) Compared with the degradation of three VOCs alone,the ozone production of mixed VOCs ’degradation decreased slightly;3) Compared with single VOCs,the carbon balance of mixed VOCs’ degradation decreased slightly as well;4) In the process of synergistic non-thermal plasma degradation of multi-component VOCs by Mn_(2)O_(3)/γ-Al_(2)O_(3) catalyst,the improvement rate of degradation rate of toluene,ethyl acetate and acetone by catalyst in mixed VOCs increased with the increase of degradation difficulty of VOCs.The carbon balance of VOCs degradation under various conditions was improved by catalyst.

关 键 词：混合VOCs降解 催化选择性 介质阻挡放电 

分 类 号：X701[环境科学与工程—环境工程]