文献类型：期刊文献

英文题名：Ultra-efficient Ru and Nb Co-Modified CeO2 Catalysts for Catalytic Oxidation of 1,2-Dichloroethane

作者：Wang, Aiyong[1];Ding, Min[1];Cai, Yuang[1];Wang, Li[1];Guo, Yun[1];Guo, Yanglong[1];Zhan, Wangcheng[1,2]

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]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Shanghai 200237, Peoples R China

年份：2024

卷号：58

期号：45

起止页码：20300

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：;EI(收录号：20244517334898);WOS:【SCI-EXPANDED(收录号:WOS:001349366600001)】；

基金：This work was supported by the National Key Research and Development Program of China (2022YFB3504200 and 2023YFC3707500), the National Natural Science Foundation of China (U21A20326, 22376061, and 22076047), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：chlorinated volatileorganic compounds; catalytic oxidation; dechlorination; cerium dioxide; CO2 selectivity

摘要：The oxidation of chlorinated volatile organic compounds on CeO2 is hindered by its high susceptibility to chlorine poisoning, resulting in a reduced efficiency and stability. In this study, Ru- and Nb-co-modified CeO2 catalysts were designed to achieve excellent activity, stability, and CO2 selectivity in the catalytic oxidation of 1,2-dichloroethane (EDC). The formation of Nb-O-Ce bonds was observed to enhance the surface acidic sites, thereby improving HCl selectivity and reducing the production of chlorinated byproducts. Meanwhile, it inhibits the formation of Ru-O-Ce and promotes the generation of highly dispersed RuO2 particles on the surface, enhancing the redox properties and mobility of the surface oxygen, thus increasing CO2 selectivity. In situ diffuse reflectance infrared Fourier transform spectroscopy results revealed that chlorine species preferentially attach to Nb species rather than to oxygen vacancies on the Ru/Nb/CeO2 catalyst. This allows more alkane groups to oxidize to formate on the oxygen vacancies, reducing byproduct concentration. Additionally, the oxidation of alkane groups to carboxylic acids is initiated on the Nb species, completing a comprehensive oxidation process under the synergistic effect of RuO2.