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Xiaoqing Dang,Caihong Qin,Jiayu Huang,Jingjing Teng,Xuemin Huang 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Adsorbed benzene/toluene on Ag-MnOx/g-Al2O3 and Ag-MnOx-CoOx/g-Al2O3 catalysts can be oxidisedby non-thermal plasma with gas circulation. The results showed that the gas circulation systemeffectively avoided the emissions of VOCs caused by plasma desorption. After the gas was circulated for90 min, compared to g-Al2O3, the introduction of Ag-MnOx/g-Al2O3 improved the COx yield by 33%, withCO2 selectivity close to 100%, and reduced the amount of O3 by 51%, while Ag-MnOx-CoOx/g-Al2O3inhibited N2O formation by 38% in comparison with g-Al2O3. Furthermore, the elimination mechanismsof N2O, O3, and the byproducts on the surface of catalysts were studied.
Xinyu Hu,Shijie Li,Xiaoqing Dang,Yufei Zhang,Qian Zhang,Huachun Zheng 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
DBD-catalytic system has been widely studied for volatile organic compounds abatement, whereas howto obtain high mineralization rate and low zone emission synchronously remains a challenge. In view ofthis, a new type of multi-stage DBD-catalytic system (MS1) was established to abatement toluene in thisstudy. The mineralization rates of reactors IPC (63.81%) and MS1 (61.14%) were much higher than MS2,PPC1 and PPC2 reactors, which were 48.36%, 46.84%, and 5.8% at 33.8 (Vp-p) kV, respectively. For exportozone concentration, IPC reactor had the highest concentration of 160 ppm, and the values of reactorsMS1, MS2, PPC1, and PPC2 were 79, 34.2, 34.25 and 29 ppm, respectively. The catalyst filled in zone IIcan be utilized to further decompose the residual toluene and intermediates and also promote thedecomposition of ozone, which lead to the superior performance of the MS1 reactor. The influence ofapplied voltage, adsorbed amount, and discharge time on the toluene removal performance was investigatedto optimize the operation parameters of MS1 reactor, their appropriate values were 28.3–31.1 (Vpp)kV, 0.179–0.223 mmol, 1 h, respectively. Lastly, the contribution of disparate zones in multi-stageDBD-catalytic system to the toluene degradation were elucidated on the basis of the GC–MS results.
Caihong Qin,Hui Guo,Pin Liu,Wenwen Bai,Jiayu Huang,Xuemin Huang,Xiaoqing Dang,Dongjie Yan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
Toluene abatement through adsorption and then plasma oxidation using ZSM-5, ZSM-5-γ-Al2O3 (Z-Al), ZSM-5-TiO2 (Z-Ti), ZSM-5-BaTiO3 (Z-Ba), and AgMn/ZSM-5-BaTiO3 (AgMn/Z-Ba) as adsorbents/catalysts was investigated. The efficiency of toluene removal reached ∼100% for all the tested adsorbents/catalysts. ZSM-5 had the lowest mineralization rate (MR) of ∼43%, while Z-Ba had the highest MR (88%) with an SCO2 of ∼80%. After loading AgMn onto Z-Ba, both the breakthrough capacity of toluene and SCO2 was increased, while the production of byproduct O3 and MR was decreased. The mixed materials created a higher amount of active species capable of deeply oxidizing adsorbed toluene.
Caihong Qin,Wenwen Bai,Pin Liu,Jiayu Huang,Hui Guo,Xuemin Huang,Xiaoqing Dang,Dongjie Yan 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
The removal of toluene using a cycling adsorption and plasma mineralization process was investigated ina packed reactor. The supports of catalysts were optimized in regards to mineralization rate (MR), CO2selectivity (SCO2), and the production of by-products. The hybrid support g-Al2O3-HY showed a muchbetter MR in comparison to that of HY alone. Using hybrid HY-g-Al2O3 as supports, loading Ag–Mn ononly HY or g-Al2O3 had a better MR than loading Ag–Mn on both HY and g-Al2O3. The stability studyshowed that intermediates accumulated on the surface of the catalyst lead to its deterioration.
Caihong Qin,Mengke Guo,Yang Zheng,Rui Yu,Jiayu Huang,Xiaoqing Dang,Dongjie Yan 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
Two-component zeolite-alumina packed dielectric barrier discharge plasma was developed to deeplymineralize toluene. Compared with packing ZSM-5 and g-Al2O3 separately in layers, uniform mixing ofZSM-5 and g-Al2O3 was more conducive to the mineralization of adsorbed toluene in nonthermal plasma. When the mixing ratio of ZSM-5 to g-Al2O3 was 1:2, the mineralization rate reached 80% afterdischarging for 120 min. Ag supported on the catalyst surface significantly improved the selectivity ofCO2. Increased relative humidity had little effect on the mineralization of adsorbed toluene, butsignificantly reduced the byproducts O3 and N2O. The adsorption and plasma mineralizationperformance of Ag/ZSM-5-g-Al2O3 duringfive cycles of toluene adsorption was stable with only thepeak concentration of CO showing a slight upward trend. GC–MS, TG, and XPS characterization of freshand used catalysts revealed deactivation of Ag/ZSM-5-g-Al2O3 in terms of CO oxidation due tointermediate organic residues and decreased amounts of Ag+ and lattice oxygen on the support ZSM-5instead of g-Al2O3.
Removal of gaseous toluene by nonthermal plasma coupled with wet scrubber containing Fe2+
Chaochao Jiang,Caihong Qin,Mengke Guo,Jiayu Huang,Dongjie Yan,Xiaoqing Dang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
A non-thermal plasma with a wet scrubber (NTP + WS) was used to degrade gaseous toluene. Comparedwith the NTP + WS/H2O system, the toluene and by-product ozone removal efficiencies were increased by10% and 85% in the NTP + WS/Fe2+ system, respectively. For 60 ppm toluene degradation, the maximummineralization rate (MR) of toluene (61%) was obtained, at the optimum Fe2+ concentration of 50 mg/L. During catalytic oxidation, the removal efficiency of toluene was limited by its solubility in WS systems. In addition, decreased Fe2+ concentration and accumulation of organics led to the system deactivation. The EPR and quenching experiments verified the presence and contribution of hydroxyl radicals (4.6%)and superoxide radicals (3.8%) to the removal efficiency of toluene. Based on the radicals and intermediatesdetected in the gas and liquid phases, a degradation mechanism for toluene in the NTP + WS/Fe2+system was proposed.
Caihong Qin,Rongrong Liu,Chaochao Jiang,Mengke Guo,Rui Yu,Jiayu Huang,Wenwen Bai,Xiaoqing Dang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
Non-thermal plasma coupling Fe2+ containing liquid-phase catalysis (NTP-LC/ Fe2+) can effectively reusethe byproduct ozone (O3) of NTP in LC/ Fe2+ for volatile organic compounds (VOCs) degradation. However,the low recycling rate of Fe2+/Fe3+ resulted in poor catalytic effect of the coupling system. In this study,the chelator protocatechuic acid (PCA) was added to LC/Fe2+ to enhance the removal of representativeVOC acetone. The results showed that adding PCA increased the acetone removal efficiency to 91% andkept O3 100% removed within 180 min. The mechanism of PCA-enhanced acetone degradation was thatPCA accelerated the Fe3+/Fe2+ cycle by generating PCA-Fe3+ chelates, which prevented the Fe3+ from precipitationand promoted the production of OH and O2 - for acetone oxidation.