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超声改性的CuO/Al2O3-MgO催化剂结构 及其超低浓度甲烷催化燃烧性能

陈艳容,  李浩杰,  杨仲卿,  樊湖

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文章导航 > 燃料化学学报（中英文）  > 2015 >  43(01): 122-128
陈艳容, 李浩杰, 杨仲卿, 樊湖. 超声改性的CuO/Al2O3-MgO催化剂结构 及其超低浓度甲烷催化燃烧性能[J]. 燃料化学学报（中英文）, 2015, 43(01): 122-128.
引用本文: 陈艳容, 李浩杰, 杨仲卿, 樊湖. 超声改性的CuO/Al2O3-MgO催化剂结构 及其超低浓度甲烷催化燃烧性能[J]. 燃料化学学报（中英文）, 2015, 43(01): 122-128.
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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(01): 122-128.
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(01): 122-128.
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超声改性的CuO/Al2O3-MgO催化剂结构 及其超低浓度甲烷催化燃烧性能

  • 1.

    重庆大学 低品位能源利用技术及系统教育部重点实验室, 重庆 400030;

  • 2.

    重庆酉水水电开发有限公司, 重庆 409809

基金项目: 国家自然科学基金(51206200); 中央高校基本科研业务经费 (CDJZR12140034).
详细信息
    通讯作者:

    陈艳容(1976-),博士,副教授,E-mail:rong_box@sina.com,Tel:023-65103114.

  • 中图分类号: TQ517.2

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

  • 1.

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

  • 2.

    Youshui Hydropower Exploiture Corporation of Chongqing, Chongqing 409809, China

    摘要
  • 摘要: 采用普通浸渍和超声改性的方法分别制备了CuO/Al2O3-MgO催化剂,用于超低浓度甲烷的催化燃烧,并利用SEM、XRD、XPS、H2-TPR等技术对催化剂进行表征,研究了超声改性作用对催化剂的结构和性能的影响.结果表明,与普通浸渍法制备的催化剂相比,在超声改性的CuO/Al2O3-MgO催化剂上,甲烷的转化率得到提高,燃烧特征温度降低.随着超声时间的延长和超声功率的增加,催化剂的催化活性均呈现先增大后减小的趋势;催化剂制备的最佳超声工况为功率150 W、时间20 min.超声改性可使催化剂的比表面积和孔容积增大,表面催化活性较高的Cu+浓度增加,活性组分CuO由晶相向非晶相转变、分散度增大,晶粒粒径变小、分布更均匀;这使得甲烷催化燃烧的表观活化能下降、催化剂活性得到增强.
    Abstract: 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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    • 参考文献(20)
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出版历程
  • 收稿日期:  2014-06-09
  • 修回日期:  2014-09-05
  • 刊出日期:  2015-01-30

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