Tandem supported Pt and ZSM-5 catalyst with separated catalytic functions for promoting multicomponent VOCs oxidation
Tandem supported Pt and ZSM-5 catalyst with separated catalytic functions for promoting multicomponent VOCs oxidation
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DOI：
10.1016/j.apcatb.2023.123131
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发表时间：
2023-07
期刊：
影响因子：
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通讯作者：
Zeya Li;Ruyi Gao;Zhiquan Hou;Xiaohui Yu;H. Dai;Jiguang Deng;Yuxi Liu
中科院分区：
文献类型：
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作者：
Zeya Li;Ruyi Gao;Zhiquan Hou;Xiaohui Yu;H. Dai;Jiguang Deng;Yuxi Liu
油漆和电子工业同时释放芳香化合物和氯化有机物。开发对这些污染物具有协同控制作用的催化剂对实现空气净化具有重要意义。然而，开发活性催化剂同时保持良好的耐氯性仍然是一个巨大的挑战，因为氧化还原性能和酸性之间的权衡很难与多氯化副产物的生产相权衡。本文介绍了一种新型的串联PtSn/CeO2&Mn/ZSM-5催化剂，并考察了其对多组分挥发性有机化合物(VOCs)氧化的催化性能。PtSn/CeO2和Mn/ZSM-5两种单独的催化剂被用于催化两种不同的顺序反应。PtSn/CeO2催化甲苯氧化生成CO2和H2O。同时，SnOx的引入有利于三氯乙烯(TCE)分子的吸附，防止了铂中心的氯中毒，并可能将吸附的TCE转化为中间体，然后被附近的Mn/ZSM-5深度氧化。该方法对甲苯(T90=296℃)和三氯乙烷(T90=384℃)具有显著的氧化效率，并产生较少的意外有毒副产物(氯苯和4-氯甲苯)。此外，该串联催化剂还具有良好的耐氯性和耐水性。综上所述，上述发现为设计和/或合成用于广泛的VOCs污染控制的先进催化剂提供了新的见解。
The painting and electronics industries simultaneously release aromatic compounds and chlorinated organics. The development of catalysts with synergistic control of these pollutants is of great significance to achieve air purification. However, developing active catalysts while maintaining good chlorine resistance remain a huge challenge due to the difficulty of the trade-off between the redox properties and acidity and the production of polychlorinated byproducts. Herein, we introduce a novel tandem PtSn/CeO2&Mn/ZSM-5 catalyst and investigate its catalytic performance for multicomponent volatile organic compounds (VOCs) oxidation. The two individual catalysts, PtSn/CeO2and Mn/ZSM-5, were used to catalyze two distinct sequential reactions. PtSn/CeO2catalyzed toluene oxidation to produce CO2and H2O. Meanwhile, the introduction of SnOxfavored the adsorption of trichloroethylene (TCE) molecules that prevented Pt sites from chlorine poisoning and possibly converted adsorbed TCE into intermediates, which were subsequently oxidized deeply by the nearby Mn/ZSM-5. This approach resulted in a remarkable oxidation efficiency for toluene (T90= 296 °C) and TCE (T90= 384 °C), with fewer unexpected toxic byproducts (chlorobenzene and 4-chlorotoluene). Furthermore, the tandem catalyst possessed excellent chlorine and water resistances. In conclusion, the above findings provide new insights into the design and/or syntheses of advanced catalysts for widespread VOCs pollution control.