文献类型：期刊文献

英文题名：Effect of ceria morphology on the performance of MnOx/CeO2 catalysts in catalytic combustion of N,N-dimethylformamide

作者：Huang, Fengying[1];Ye, Dongsheng[1];Guo, Xiaohan[1];Zhan, Wangcheng[1];Guo, Yun[1];Wang, Li[1];Wang, Yunsong[1];Guo, Yanglong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2020

卷号：10

期号：8

起止页码：2473

外文期刊名：CATALYSIS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20202408815679);WOS:【SCI-EXPANDED(收录号:WOS:000530288800013)】；

基金：This work was supported by the National Key Research and Development Program of China (2016YFC0204300) and the Fundamental Research Funds for the Central Universities (222201717003).

语种：英文

外文关键词：Cerium oxide - Nanocatalysts - Catalyst activity - Organic solvents - Ammonia - Catalyst selectivity - Dimethylformamide - Combustion - Manganese oxide - Reaction intermediates - Morphology - Precipitation (chemical)

摘要：MnOx/CeO2 catalysts were prepared by a deposition-precipitation method, through loading MnOx into ceria supports with different morphologies (nanorods (NRs), nanocubes (NCs) and nano-octahedrons (NOs)). As for the catalytic combustion of N,N-dimethylformamide (DMF), the ceria morphology has a great impact on the catalytic activity, and loading of MnOx significantly enhances the catalytic activity as follows: MnOx/CeO2-NRs > MnOx/CeO2-NCs > MnOx/CeO2-NOs > CeO2-NRs > CeO2-NCs > CeO2-NOs. The MnOx/CeO2-NR catalyst exhibits the best catalytic performance, in which DMF is completely oxidized at 180 degrees C, and the CO2 and N-2 yields are 98% and 99%, respectively. The catalytic performance of MnOx/CeO2 catalysts at high reaction temperature under the wet reaction conditions with introduction of 5 vol% water vapor is better than that under the dry reaction conditions, in which water easily desorbs from the catalyst surface and then reacts with the reaction intermediates. The results of nitrogen sorption, XRD, O-2-TPD, XPS and NH3-TPD characterization indicate that the excellent catalytic performance of the MnOx/CeO2-NR catalyst is closely related to its high specific surface area, high concentration of oxygen vacancies and active oxygen species, and more and stronger surface acid sites, which are due to the strong interaction between MnOx and CeO2 nanorods.