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Citation: CHEN Yan-rong, LI Hao-jie, YANG Zhong-qing, FAN Hu. Structure of CuO/Al2O3-MgO catalyst modified by ultrasound assisted dispersion and its catalytic performance in the combustion of lean methane[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(1): 122-128. shu

Structure of CuO/Al2O3-MgO catalyst modified by ultrasound assisted dispersion and its catalytic performance in the combustion of lean methane

  • 1.

    1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China;

  • Corresponding author: CHEN Yan-rong, 
  • Received Date: 9 June 2014
    Available Online: 5 September 2014

    Fund Project: 国家自然科学基金(51206200) (51206200) 中央高校基本科研业务经费 (CDJZR12140034). (CDJZR12140034)

  • CuO/Al2O3-MgO catalyst was prepared by ultrasound assisted dispersion and used in the catalytic combustion of lean methane. The CuO/Al2O3-MgO catalyst was characterized by SEM, XRD, XPS, and H2-TPR and the effect of ultrasonic modification on the structure and catalytic performance was investigated. The results showed that the activity of the CuO/Al2O3-MgO catalyst prepared by ultrasonic treatment is much higher than that prepared by the conventional impregnation method. The catalytic activity of CuO/Al2O3-MgO is related to both the ultrasonic time and power; the optimum ultrasonic time and power are 20 min and 150 W, respectively. Compared with the conventional impregnation, the ultrasonic modification is propitious to get a catalyst with higher surface area and pore volume, smaller particles, and higher dispersion of active Cu species. Moreover, the ultrasonic modification may promote the formation of Cu+ on the catalyst surface and improve the low temperature reducibility. All these can depress the activation energy and enhance the activity of the CuO/Al2O3-MgO catalyst in methane oxidation.
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