文献类型：期刊文献

英文题名：Catalytic Hydrolysis-Oxidation of Halogenated Methanes over Phase- and Defect-Engineered CePO4: Halogenated Byproduct-Free and Stable Elimination

作者：Dai, Qiguang[1];Xu, Ronghua[1];Xia, Hangqi[3];Qiao, Boyuan[3];Niu, Qiang[3];Wang, Li[1];Wang, Aiyong[1];Guo, Yun[1];Guo, Yanglong[1];Wang, Wei[2];Zhan, Wangcheng[1]

机构：[1]East China Univ Sci & Technol, Res Inst Ind Catalysis, Sch Chem & Mol Engn, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[2]Changzhou Univ, Sch Environm Sci & Engn, Changzhou 213164, Jiangsu, Peoples R China;[3]Erdos Elect Power & Met Grp Co Ltd, Ordos 016064, Inner Mongolia, Peoples R China

年份：2024

卷号：58

期号：30

起止页码：13562

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：;EI(收录号：20243016758042);WOS:【SCI-EXPANDED(收录号:WOS:001274501200001)】；

基金：This work was supported by the National Key Research and Development Program of China (2022YFB3504200) and the National Natural Science Foundation of China (22276055 and 22106010).

语种：英文

外文关键词：CVOCs; hydrolysis-oxidation; Ce-basedcatalysts; H2O promoting effect; electricfield

摘要：Catalytic elimination of halogenated volatile organic compound (HVOC) emissions was still a huge challenge through conventional catalytic combustion technology, such as the formation of halogenated byproducts and the destruction of the catalyst structure; hence, more efficient catalysts or a new route was eagerly desired. In this work, crystal phase- and defect-engineered CePO4 was rationally designed and presented abundant acid sites, moderate redox ability, and superior thermal/chemical stability; the halogenated byproduct-free and stable elimination of HVOCs was achieved especially in the presence of H2O. Hexagonal and defective CePO4 with more structural H2O and Br & oslash;nsted/Lewis acid sites was more reactive and durable compared with monoclinic CePO4. Based on the phase and defect engineering of CePO4, in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS), and kinetic isotope effect experiments, a hydrolysis-oxidation pathway characterized by the direct involvement of H2O was proposed. Initiatively, an external electric field (5 mA) significantly accelerated the elimination of HVOCs and even 90% conversion of dichloromethane could be obtained at 170 degrees C over hexagonal CePO4. The structure-performance-dependent relationships of the engineered CePO4 contributed to the rational design of efficient catalysts for HVOC elimination, and this pioneering work on external electric field-assisted catalytic hydrolysis-oxidation established an innovative HVOC elimination route.