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首页> 外文期刊>Chemosphere >Promotional effect of doping Cu into cerium-titanium binary oxides catalyst for deep oxidation of gaseous dichloromethane
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Promotional effect of doping Cu into cerium-titanium binary oxides catalyst for deep oxidation of gaseous dichloromethane

机译：铈铜二元氧化物催化剂中掺杂铜对气态二氯甲烷深度氧化的促进作用

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摘要

In recent years, significant effort has been made in the development of novel catalysts for the total oxidation of chlorinated volatile organic compounds, In this work the catalytic activity of Cu doped cerium-titanium binary oxides for the oxidation of dichloromethane (DCM) have been studied for the first time. Combining catalysts characterization and activity data, it was found that Cu ions can uniformly disperse into titanium dioxide to form solid solution and induce the creation of additional surface oxygen species on the catalysts surface, while moderate amount of Ce ions are still needed for the activation of C-CI. Detailed analysis of the in-situ FTIR experiment results revealed that the surface oxygen species, especially the hydroxyl groups associated with Cu ions, can promote the deep oxidation of the intermediate species formed in the nucleophilic substitution process occurred on the active sites of catalysts surface. The sample with the Cu/Ce molar ratio of 1:3 obtained a better CO2 selectivity than that reached with cerium-titanium binary oxides. Meanwhile, according to element balance analysis, removal of chlorine from the catalyst surface was also promoted by Cu doping. (C) 2018 Elsevier Ltd. All rights reserved.
机译：近年来，在开发用于完全氧化氯代挥发性有机化合物的新型催化剂方面已经做出了巨大的努力。在这项工作中，研究了掺杂铜的铈钛二元氧化物对二氯甲烷（DCM）氧化的催化活性。首次。结合催化剂的表征和活性数据，发现Cu离子可以均匀地分散在二氧化钛中形成固溶体并诱导在催化剂表面上产生更多的表面氧，而活化Ce仍需要适量的Ce离子。 C-CI。对原位FTIR实验结果的详细分析表明，表面氧物种，尤其是与Cu离子缔合的羟基，可以促进在亲核取代过程中形成的中间物种在催化剂表面活性位上的深度氧化。 Cu / Ce摩尔比为1：3的样品获得的CO2选择性比铈-钛二元氧化物更好。同时，根据元素平衡分析，通过Cu掺杂也促进了从催化剂表面除去氯。 （C）2018 Elsevier Ltd.保留所有权利。

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