Catalytic oxidation of o-chlorophenol over Co2XAI(X=Co,Mg,Ca,Ni)hydrotalcite-derived mixed oxide catalysts  

作　　者：Na Li Xin Xing Yonggang Sun Jie Cheng Gang Wang Zhongshen Zhang Zhengping Hao 

机构地区：[1]Key Laboratory of Environmental Nanotechnology and Health Effects,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]National Engineering Laboratory for VOCs Pollution Control Material&Technology,Research Center for Environmental Material and Pollution Control Technology,University of Chinese Academy of Sciences,Beijing 101408,China

出　　处：《Frontiers of Environmental Science & Engineering》2020年第6期159-169,共11页环境科学与工程前沿（英文）

基　　金：This work is financially supported by the National Natural Science Foundation of China(Grant Nos.21677160 and 21477149);Beijing Municipal Science&Technology Commission(Nos.Z181100000118003 and Z 181100005418011).

摘　　要：A cobalt-based hydrotalcite-like compound was prepared using a constant-pH coprecipitation method.Cobalt-transition metal oxides(Co2XA10,X=Co,Mg,Ca and Ni)were investigated for the deep catalytic oxidation of o-chlorophenol as a typical heteroatom contaminant containing chlorine atoms.The partial substitution of Co by Mg,Ca or Ni in the mixed oxide can promote the catalytic oxidation of o-chlorophenol.The Co2MgA10 catalyst presented the best catalytic activity,and could maintain 90%o-chlorophenol conversion at 167.1℃,compared only 27%conversion for the Co3A10 catalyst.The results demonstrated that the high activity could be attributed to its increased low-temperature reducibility,rich active oxygen species and excellent oxygen mobility.In the existence of acid and base sites,catalysts with strong basicity also showed preferred activity.The organic by-products generated during the o-chlorophenol catalytic oxidation over Co2MgAlO catalyst included carbon tetrachloride,trichloroethylene,2,4-dichlorophenol,and 2,6-dichloro-p-benzoquinon,et al.This work provides a facile method for the preparation of Co-based composite oxide catalysts,which represent promising candidates for typical chlorinated and oxygenated volatile organic compounds.

关 键 词：Hydrotalcite-derived mixed oxides O-CHLOROPHENOL Catalytic oxidation Organic by-products 

分 类 号：O643.36[理学—物理化学]