Journal of Jishou University(Natural Sciences Edition)

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Structure of the Cobalt-Based Oxide and Its Catalytic Performance in Oxidation of Toluene

HU Xiuzhen,JIANG Chongwen,ZHU Jundong,LONG Jie,SONG Quzhi   

  1. (Department of Chemical Engineering,College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)
  • Online:2018-05-25 Published:2018-06-27
  • About author:HU Xiuzhen (1993-),female,was born in Shaoyang City,Hunan Province,master candidate of College of Chemistry and Chemical Engineering,Central South University;research areas are materials and catalysis
  • Supported by:

    National Natural Science Foundation of China (21476267);Hunan Provincial Science and Technology Plan Project (2016TP1007)


Cobalt-based oxides A-Co (A=Cu,Mn,Ce) and pure cobalt oxide prepared by using sol-gel method have been tested for toluene oxidation.It is found that all binary cobalt-based oxides showed higher catalytic performance in the oxidation of toluene than pure cobalt oxide.The most efficient catalyst was Ce-Co with t10 and t90 (the temperature required for achieving 10% and 90% conversion of toluene,respectively) values of 221 and 238 ℃,respectively.In addition,the stability of the Ce-Co oxide was evaluated at 99% of toluene conversion at 240 ℃ for 50 hours.The characterization techniques of X-ray diffractometry,nitrogen adsorption-desorption,scanning electron microscope,H2 temperature programmed reduction and X-ray photoelectron spectroscopy were used to explain the improved catalytic performance.The results indicated that Ce4+/Ce3+ and Co3+/Co2+ redox couples in the Ce-Co catalyst facilitated the mobility of oxygen and improved the reducibility of surface oxygen accounting for the synergetic effect in the oxidation of toluene.

Key words: catalytic oxidation, Co-based oxides, sol-gel, VOC, toluene

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