物理化学学报 >> 2005, Vol. 21 >> Issue (11): 1311-1314.doi: 10.3866/PKU.WHXB20051124

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介孔Cr-MSU-1的合成、表征及催化性能

刘立成; 李会泉; 蔡卫权; 张懿   

  1. 中国科学院过程工程研究所, 绿色过程与工程重点实验室, 北京 100080； 中国科学院研究生院, 北京 100049
  • 收稿日期:2005-03-17 修回日期:2005-05-30 发布日期:2005-11-15
  • 通讯作者: 李会泉 E-mail:hqli@home.ipe.ac.cn

Synthesis, Characterization and Catalytic Activity of Mesoporous Cr-MSU-1

LIU Li-cheng; LI Hui-quan; CAI Wei-quan; ZHANG Yi   

  1. The Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080; Graduate School of the Chinese Academy of Sciences, Beijing 100049
  • Received:2005-03-17 Revised:2005-05-30 Published:2005-11-15
  • Contact: LI Hui-quan E-mail:hqli@home.ipe.ac.cn

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摘要： 以Na2SiO3为硅源, 非离子型表面活性剂脂肪醇聚氧乙烯醚A(EO)9为模板剂合成了介孔Cr-MSU-1, 并通过XRD、HRTEM、N2吸附-脱附、FT-IR和DR UV-Vis等手段对其进行了表征. 结果表明, Cr进入了介孔MSU-1骨架中, 并大部分以四配位的Cr(VI)形式存在. 将Cr-MSU-1作为催化剂用于CO2氧化乙烷脱氢反应, 表现出了良好的催化活性, 650 ℃下乙烷的转化率和乙烯的选择性分别为31.7%和96.1%.

关键词: 介孔材料, Cr-MSU-1, 氧化脱氢, 乙烷, CO2

Abstract: Mesoporous Cr-MSU-1 was successfully prepared by using sodium silicate, chromium nitrate, fatty alcohol polyoxyethylene ether (A(EO)9) as the source of silicone, metal and mesostructure-directing agent, respectively. Cr-MSU-1 and MSU-1 were comparatively characterized by XRD, HRTEM, N2 adsorption-desorption, FT-IR and DR UV-Vis techniques. No obvious differences on structural and textural properties between them were observed from XRD patterns and N2 adsorption-desorption isotherms. The HRTEM image confirmed that Cr-MSU-1 took on wormlike mesostructure that was similar to MSU-1. In the FT-IR patterns, the introduction of Cr showed slight influence to adsorption bands of MSU-1, which indicated that Cr was incorporated into the framework of MSU-1. It is suggested from the DR UV-Vis spectra that Cr species mostly formed Cr(VI) in tetrahedral coordination in Cr-MSU-1. The Cr-MSU-1 catalyst performs well in the dehydrogenation of ethane with CO2, resulting in the production of ethylene with a conversion of 31.7% and a selectivity of 96.1% at 650 ℃.

Key words: Mesoporous materials, Cr-MSU-1, Oxidative dehydrogenation, Ethane, Carbon dioxide