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首页> 外文期刊>Journal of Hazardous Materials >Synergetic degradation of VOCs by vacuum ultraviolet photolysis and catalytic ozonation over Mn-xCe/ZSM-5
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Synergetic degradation of VOCs by vacuum ultraviolet photolysis and catalytic ozonation over Mn-xCe/ZSM-5

机译：真空紫外光解和Mn-xCe / ZSM-5上的催化臭氧化协同降解VOCs

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摘要

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 O-3 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 O-3 by-product could be eliminated in the process. It was found that the strong interaction of the Mn-O-Ce 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 O-3 which eventually form the reactive oxygen species over Mn-xCe/ZSM-5.
机译：挥发性有机化合物（VOC）是形成细颗粒物和光化学烟雾的最重要前体之一，应严格控制。真空紫外（VUV）光解技术在温和的反应条件下具有强大的氧化能力，因此为去除VOC提供了一种简便而有效的方法。但是，VUV照射会产生臭氧，从而带来二次污染。在这项研究中，ZSM-5负载的Mn-Ce混合氧化物（Mn-xCe / ZSM-5）被制备为臭氧催化氧化（OZCO）过程的有效催化剂，与VUV光解法结合使用以去除O-3副产物同时促进甲苯氧化。结果表明，Mn-3Ce / ZSM-5催化剂可将气相甲苯（一种有害的VOC）的催化降解效率提高至93％。同时，在此过程中几乎可以消除所有O-3副产物。发现在混合氧化物中Mn-O-Ce键的强相互作用以及Mn和Ce基物种的可变化学价会调节Mn-xCe / ZSM-5的氧化还原能力。表面Ce3 +种类和氧空位表面密度的增加将有利于O-3的吸附和催化转化，O-3最终比Mn-xCe / ZSM-5形成活性氧。

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