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Synergetic degradation of VOCs by vacuum ultraviolet photolysis and catalytic ozonation over Mn-xCe/ZSM-5.
J Hazard Mater. 2019 02 15; 364:770-779.JH

Abstract

Volatile organic compounds (VOCs) are one of the most important precursors to form the fine particulate matter and photochemical smog, and should be strictly controlled. Vacuum ultraviolet (VUV) photolysis has provided a facile and an effective way to remove VOCs due to its powerful oxidation capability under mild reaction conditions. However, VUV irradiation would generate ozone which brings about secondary pollution. In this study, ZSM-5 supported Mn-Ce mixed oxides (Mn-xCe/ZSM-5) were fabricated as efficient catalysts for ozone catalytic oxidation (OZCO) process, which were applied in combination with VUV photolysis to remove O3 byproduct and simultaneously facilitate toluene oxidation. The results indicated that the Mn-3Ce/ZSM-5 catalyst considerably enhanced the catalytic degradation efficiency up to 93% for the gas-phase toluene, one of the hazardous VOCs. Meanwhile, almost all the O3 by-product could be eliminated in the process. It was found that the strong interaction of the MnOCe bond and the variable chemical valence of Mn and Ce based species in the mixed oxides would tune the redox capacity of Mn-xCe /ZSM-5. An increase in surface Ce3+ species and surface density of oxygen vacancies would benefit the adsorption and catalytic transformation of O3 which eventually form the reactive oxygen species over Mn-xCe/ZSM-5.

Authors+Show Affiliations

School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, China. Electronic address: seabao8@gmail.com.School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.Department of Mechanical Engineering, University of Hong Kong, Hong Kong.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

30447561

Citation

Shu, Yajie, et al. "Synergetic Degradation of VOCs By Vacuum Ultraviolet Photolysis and Catalytic Ozonation Over Mn-xCe/ZSM-5." Journal of Hazardous Materials, vol. 364, 2019, pp. 770-779.
Shu Y, He M, Ji J, et al. Synergetic degradation of VOCs by vacuum ultraviolet photolysis and catalytic ozonation over Mn-xCe/ZSM-5. J Hazard Mater. 2019;364:770-779.
Shu, Y., He, M., Ji, J., Huang, H., Liu, S., & Leung, D. Y. C. (2019). Synergetic degradation of VOCs by vacuum ultraviolet photolysis and catalytic ozonation over Mn-xCe/ZSM-5. Journal of Hazardous Materials, 364, 770-779. https://doi.org/10.1016/j.jhazmat.2018.10.057
Shu Y, et al. Synergetic Degradation of VOCs By Vacuum Ultraviolet Photolysis and Catalytic Ozonation Over Mn-xCe/ZSM-5. J Hazard Mater. 2019 02 15;364:770-779. PubMed PMID: 30447561.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Synergetic degradation of VOCs by vacuum ultraviolet photolysis and catalytic ozonation over Mn-xCe/ZSM-5. AU - Shu,Yajie, AU - He,Miao, AU - Ji,Jian, AU - Huang,Haibao, AU - Liu,Shengwei, AU - Leung,Dennis Y C, Y1 - 2018/10/24/ PY - 2018/08/21/received PY - 2018/10/18/revised PY - 2018/10/19/accepted PY - 2018/11/18/pubmed PY - 2018/11/18/medline PY - 2018/11/18/entrez KW - Oxygen vacancies KW - Ozone catalytic oxidation KW - Redox property KW - Toluene KW - VUV photolysis SP - 770 EP - 779 JF - Journal of hazardous materials JO - J. Hazard. Mater. VL - 364 N2 - Volatile organic compounds (VOCs) are one of the most important precursors to form the fine particulate matter and photochemical smog, and should be strictly controlled. Vacuum ultraviolet (VUV) photolysis has provided a facile and an effective way to remove VOCs due to its powerful oxidation capability under mild reaction conditions. However, VUV irradiation would generate ozone which brings about secondary pollution. In this study, ZSM-5 supported Mn-Ce mixed oxides (Mn-xCe/ZSM-5) were fabricated as efficient catalysts for ozone catalytic oxidation (OZCO) process, which were applied in combination with VUV photolysis to remove O3 byproduct and simultaneously facilitate toluene oxidation. The results indicated that the Mn-3Ce/ZSM-5 catalyst considerably enhanced the catalytic degradation efficiency up to 93% for the gas-phase toluene, one of the hazardous VOCs. Meanwhile, almost all the O3 by-product could be eliminated in the process. It was found that the strong interaction of the MnOCe bond and the variable chemical valence of Mn and Ce based species in the mixed oxides would tune the redox capacity of Mn-xCe /ZSM-5. An increase in surface Ce3+ species and surface density of oxygen vacancies would benefit the adsorption and catalytic transformation of O3 which eventually form the reactive oxygen species over Mn-xCe/ZSM-5. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/30447561/Synergetic_degradation_of_VOCs_by_vacuum_ultraviolet_photolysis_and_catalytic_ozonation_over_Mn_xCe/ZSM_5_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(18)30966-X DB - PRIME DP - Unbound Medicine ER -
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