Heterobimetallic CoCeO_(x) derived from cobalt partially-substituted Ce-UiO-66 for chlorobenzene efficient catalytic destruction  

作　　者：Lu Li Shuangshuang Fu Dan Tao Jiaxun Zhang Mingjiao Tian Jianwen Shi Mudi Ma Chi He 

机构地区：[1]State Key Laboratory of Electrical Insulation and Power Equipment,Center of Nanomaterials for Renewable Energy,School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China [2]School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China [3]College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China [4]State Key Laboratory of Multiphase Flow in Power Engineering,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China [5]School of Human Settlements and Civil Engineering,Xi'an Jiaotong University,Xi'an 710049,China

出　　处：《Journal of Rare Earths》2023年第6期810-819,I0001,共11页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(22106124,22276145);the Natural Science Foundation of Shaanxi Province(2021JQ-011).

摘　　要：Here,a metal-organic framework(MOF)-templated strategy was applied to synthesize the CoCeO_(x) bimetallic catalysts by calcining Co partially-substituted Ce-UiO-66.It is indicated that the substituted Co limited Ce cations in Ce-UiO-66 framework,which affects its growth and structure crystallinity to some extent.After pyrolysis treatment,the derived bimetallic oxide(CoCeO_(x)-M)can basically keep the octahedral structure and the surface area is much higher than the bulk metal composite oxide(CoCeO_(x)-B)prepared by traditional coprecipitation.Results reveal that CoCeO_(x)-M performs the best chlorobenzene degradation capacity,superior stability and vapor tolerance compared with those of CeO_(2)-M(derived from Ce-UiO-66)and CoCeO_(x)-B.At the same time,it is favorable to inhibit the formation of CO during the oxidation reaction.The superior catalytic performance of CoCeO_(x)-M is attributed to a good dispersion of metal cations,high surface area and active oxygen concentration,and good redox property.Moreover,the formation of organic byproducts especially chlorinated organics can be obviously prohibited over CoCeO_(x)-M compared with that of CeO_(2)-M.Mechanism study reveals that chlorobenzene dissociates on the surface of CoCeO_(x)-M to form carboxylates such as acetate species,maleate and phenolate before finally oxidized into CO_(2),H_(2)O,and HCl.The present work poses new insights into the fabrication of efficient catalysts for industrial CVOC purification.

关 键 词：Ce-UiO-66 CoCeO_(x)bimetallic oxide CHLOROBENZENE Catalytic oxidation Reaction mechanism Rare earths 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]