高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (2): 280.

• 研究论文 • 上一篇    下一篇

负载型Cu2(OAc)2/SiO2催化剂的制备表征及其活化──CO2和EO合成EC的TPD和In sisu-IR研究

高健, 钟顺和   

  1. 天津大学化工学院, 天津 300072
  • 收稿日期:2000-03-10 出版日期:2001-02-24 发布日期:2001-02-24
  • 通讯作者: 钟顺和(1938年出生),男,教授,博士生导师,从事多相工业催化,均相催化,无机膜催化及激光表面催化等研究.
  • 基金资助:

    教育部博士学科点基金(批准号:D09902)资助

Synthesis and Characterization of Supported Complex Catalyst Cu2(OAc)2/SiO2──TPD,In situ-IR Study for Synthesis of EC by Activation of CO2 and EO

GAO Jian, ZHONG Shun-He   

  1. College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2000-03-10 Online:2001-02-24 Published:2001-02-24

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摘要： 用表面改性和金属嫁接相结合的双核移植法制备了SiO2负载的双核配合物催化剂Cu2(OAc)2/SiO2,用络合滴定、IR、固定相UVVis光谱和磁分析方法表征了催化剂表面的化学组成、桥基配体的配位方式、金属离子的价态和配位环境.根据实验结果,给出了催化剂的总体模型,并讨论了催化剂的形成机理.运用TPD和insituIR技术研究了催化剂对CO2和环氧乙烷(EO)的化学吸附特性及催化合成碳酸乙烯酯(EC)的反应性能.实验结果表明,CO2和EC在催化剂表面形成桥式化学吸附态,其脱附峰温度分别为120℃和130℃;催化剂对CO2和EO合成EC有良好的催化活性.

关键词: 双核配合物, 负载型催化剂, CO2化学吸附, 环氧乙烷化学吸附, 碳酸乙烯酯合成

Abstract: Silica supported dinuclear complex catalyst was prepared by SiO2 surface modification and metal anchoring, namely Cu2(OAc)2/SiO2. The chemical composition, bonding fashion of the bridging ligand and coordination environment of the metal ions on the SiO2 surface were characterized by titration method, IRand UV-Vis analysis.The catalyst mode as a whole was given by the illumination of the formation of the catalyst. The absorption properties of catalyst Cu2(OAc)2/SiO2 to molecules CO2 and EO (ethylene oxide) were studied by molecule probing IRand TPDtechniques. Experimental results indicated that the CO2 and EOwere chemisorbed and bridging absorption structures were formed between the two copper (Ⅱ) ions. TPD-MSexperiments established that CO2 and EOdesorbed from the surface of the catalyst at 120 ℃ and 130 ℃ respectively. Catalytic reaction properties for the synthesis of EC (ethylene carbonate) from CO2 and EOwas studied by TPSR-IRon line technique, indicating that the reaction could undertake at 120 ℃ and low pressure.

Key words: Dinuclear complex, Supported complex catalyst, Chemisorption of CO2, Chemisorption of ethylene oxide, Synthesis of ethylene carbonate

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