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

doi:10.3969/j.cnki.jdxb.2018.03.013

Abstract

Abstract:

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

HU Xiuzhen,JIANG Chongwen,ZHU Jundong,LONG Jie,SONG Quzhi. Structure of the Cobalt-Based Oxide and Its Catalytic Performance in Oxidation of Toluene[J]. Journal of Jishou University（Natural Sciences Edition), DOI: 10.3969/j.cnki.jdxb.2018.03.013.

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