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高等学校化学研究 ›› 2010, Vol. 26 ›› Issue (1): 105-109.

• Articles • 上一篇    下一篇

Synthesis of Mesoporous Cu-Mn-Al2O3 Materials and Their Applications to Preferential Catalytic Oxidation of CO in a Hydrogen-rich Stream

FANG De-ren1,2, REN Wan-zhong2, LIU Zhong-min1*, XU Xiu-feng2, ZHANG Hui-min2 and LIAO Wei-ping2   

  1. 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China;
    2. Institute of Applied Catalysis, Yantai University, Yantai 264005, P. R. China
  • 收稿日期:2009-03-17 修回日期:2009-08-26 出版日期:2010-01-04 发布日期:2010-03-29
  • 通讯作者: LIU Zhong-min. E-mail: zml@dicp.ac.cn
  • 基金资助:

    Supported by the Science and Technology Development Project of Shandong Province, China(No.2007GG3WZ03018).

Synthesis of Mesoporous Cu-Mn-Al2O3 Materials and Their Applications to Preferential Catalytic Oxidation of CO in a Hydrogen-rich Stream

FANG De-ren1,2, REN Wan-zhong2, LIU Zhong-min1*, XU Xiu-feng2, ZHANG Hui-min2 and LIAO Wei-ping2   

  1. 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China;
    2. Institute of Applied Catalysis, Yantai University, Yantai 264005, P. R. China
  • Received:2009-03-17 Revised:2009-08-26 Online:2010-01-04 Published:2010-03-29
  • Contact: LIU Zhong-min. E-mail: zml@dicp.ac.cn
  • Supported by:

    Supported by the Science and Technology Development Project of Shandong Province, China(No.2007GG3WZ03018).

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摘要：

A series of mesoporous Cu-Mn-Al2O3(CMA) materials was synthesized at moderate temperature and their structures were characterized by XRD, N2 physical adsorption and TPR techniques. It was found that using metal complex ion[Cu(NH3)42+-Mn(NH3)62+] as raw materials is easier to form good-structure mesoporous Cu-Mn-Al2O3 materials than using its nitrate salt [Cu(NO3)2-Mn(NO3)2]. The TPR tests results indicate that CuO and MnOx were homogeneously dispersed in the mesoporous materials. Their catalytic application to preferential catalytic oxidation of CO in a hydrogen-rich stream was studied. The activity varies in the order of CMA(1:1, molar ratio)＞   CMA(1:2)＞CMA(2:1)＞CMA(CP)＞CMA(1:0)≈CMA(0:1). The CMA(1:0) and CMA(0:1) have lower activity compared to other samples, implying that there existed coordination effect between Cu-Mn in the samples. The selectivity varied in the order of CMA(0:1)≥CMA(1:2)＞CMA(1:1)＞CMA(2:1)＞CMA(1:0) at higher temperature   (≥120 °C), indicating that increasing the Cu content enhanced the conversion of H2. The sample CMA(CP) made by coprecipitation method has a lower CO oxidation activity and selectivity than its counter-parts of mesoporous Cu-Mn-Al2O3 materials[CMA(1:2)], this attributed to the lower surface area of the former and poor interaction of CuO with  MnOx.

关键词: Cu-Mn-Al2O3; Mesoporous material; Selective CO oxidation; Hydrogen-rich; Catalyst

Abstract:

A series of mesoporous Cu-Mn-Al2O3(CMA) materials was synthesized at moderate temperature and their structures were characterized by XRD, N2 physical adsorption and TPR techniques. It was found that using metal complex ion[Cu(NH3)42+-Mn(NH3)62+] as raw materials is easier to form good-structure mesoporous Cu-Mn-Al2O3 materials than using its nitrate salt [Cu(NO3)2-Mn(NO3)2]. The TPR tests results indicate that CuO and MnOx were homogeneously dispersed in the mesoporous materials. Their catalytic application to preferential catalytic oxidation of CO in a hydrogen-rich stream was studied. The activity varies in the order of CMA(1:1, molar ratio)＞   CMA(1:2)＞CMA(2:1)＞CMA(CP)＞CMA(1:0)≈CMA(0:1). The CMA(1:0) and CMA(0:1) have lower activity compared to other samples, implying that there existed coordination effect between Cu-Mn in the samples. The selectivity varied in the order of CMA(0:1)≥CMA(1:2)＞CMA(1:1)＞CMA(2:1)＞CMA(1:0) at higher temperature   (≥120 °C), indicating that increasing the Cu content enhanced the conversion of H2. The sample CMA(CP) made by coprecipitation method has a lower CO oxidation activity and selectivity than its counter-parts of mesoporous Cu-Mn-Al2O3 materials[CMA(1:2)], this attributed to the lower surface area of the former and poor interaction of CuO with  MnOx.

Key words: Cu-Mn-Al2O3; Mesoporous material; Selective CO oxidation; Hydrogen-rich; Catalyst