Efficient catalytic oxidation of chlorinated volatile organic compounds over RuO2-WOx/Sn0.2Ti0.8O2 catalysts: Insight into the Cl poisoning mechanism of acid sites
Efficient catalytic oxidation of chlorinated volatile organic compounds over RuO2-WOx/Sn0.2Ti0.8O2 catalysts: Insight into the Cl poisoning mechanism of acid sites
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DOI：
10.1016/j.cej.2023.142471
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发表时间：
2023-03
影响因子：
15.1
通讯作者：
F. Zhou;Qifeng Xin;Yujie Fu;Zhesheng Hua;Yi Dong;Mingchu Ran;Hao Song;Shaojun Liu;
中科院分区：
文献类型：
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作者：
F. Zhou;Qifeng Xin;Yujie Fu;Zhesheng Hua;Yi Dong;Mingchu Ran;Hao Song;Shaojun Liu;
开发具有高活性、高选择性和高耐久性的催化剂对于氯代挥发性有机化合物（CVOCs）的催化氧化至关重要。虽然酸改性载体被广泛应用于催化剂中以提高低温催化活性，但其酸性中心容易被Cl中毒而失活，其中毒机理尚不清楚。制备了一系列RuO 2-WOx/Sn 0. 2 Ti 0. 8 O2催化剂，并将其用于二氯甲烷（DCM）的催化氧化。光谱表征表明，负载量的氧化钨高度影响的表面物种的结构，因此，低温催化活性。SEM、XRD和DFT计算表明，催化剂失活的主要原因是钨物种以WO_2Cl_2的形式流失。负载RuO_2可有效地避免Deacon反应中钨物种的损失。堇青石催化剂对不同类型的CVOCs的氧化表现出优异的催化活性。
The development of catalysts with high activity, selectivity, and durability is crucial for the catalytic oxidation of chlorinated volatile organic compounds (CVOCs). Although acid-modified supports are widely used in catalysis to improve the catalytic activity at low temperature, the acid sites are easily deactivated by Cl poisoning, and the poisoning mechanism remains unclear. Here, a series of RuO2-WOx/Sn0.2Ti0.8O2catalysts were synthesized for dichloromethane (DCM) catalytic oxidation. Spectroscopic characterizations revealed that the loading amount of tungsten oxide highly affects the structure of the surface species and, consequently, the low-temperature catalytic activity. SEM, XRD and DFT calculations elucidated that the loss of tungsten species in the form of WO2Cl2is the main reason for the catalyst deactivation. By loading RuO2, the loss of tungsten species could be effectively avoidedviathe Deacon reaction. The cordierite catalyst exhibits excellent catalytic activity for the oxidation of different types of CVOCs.