Constructing a high concentration CuO/CeO_(2) interface for complete oxidation of toluene:The fantastic application of spatial confinement strategy  

作　　者：Chao Wang Yan Li Huiao Liu Ziying Hu Xinhui Hao Hongpeng Jia Jing Chen Canzhong Lu 

机构地区：[1]CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [2]College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China [3]Xiamen Institute of Rare-earth Materials,Haixi Institutes,Chinese Academy of Sciences,Xiamen 361021,China [4]Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [5]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Rare Earths》2023年第6期850-861,I0002,共13页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(2022YFB3504200);the National Natural Science Foundation of China(21501175,2217060219);the Natural Science Foundation of Fujian Province(2022Y0071);the Xiamen Science and Technology Program Project(3502Z20172029,3502Z20203085).

摘　　要：In this paper,CeO_(2) substrate was prepared by the sol-gel method,further CuO was introduced by adding the copper complexes with chelating agents into the sol-gel precursors of CeO_(2),in which different chelating agents(β-cyclodextrin,glucose and trimesic acid)were tried.This synthesis method helps the CuO species to disperse very uniformly in the CeO_(2) substrates.When the amount of copper oxide is up to33 mol%,the CuO/CeO_(2) samples can still maintain a highly dispersed state.The CeO_(2) and CuO/CeO_(2)samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),temperature-programmed reduction of hydrogen(H_(2)-TPR),temperature-programed desorption(O_(2)-TPD),etc.It is found that the CuO/CeO_(2) catalyst prepared byβ-cyclodextrin(βCuO/CeO_(2)) exhibits better catalytic performance owing to the higher dispersion,higher specific surface area,more defects,more active Ce3+and Cu^(+) ions,more oxygen vacancies,more surface active oxygen,relatively better low temperature reducibility,and the exposed(110) active facets.In the condition of 1000×10-6toluene in air and WHSV=60000 mL/(g·h),the T90for toluene conversion is 227℃.The reaction mechanism of toluene catalytic oxidation over CeO_(2)andβCuO/CeO_(2) is discussed by the study of in-situ DRIFTS.This work affords a simple and efficient method for the synthesis of highly dispersed bimetal oxide catalysts with high contents.

关 键 词：Catalytic oxidation TOLUENE Confinement strategy Chelating agent Rare earths Copper 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]