应用化学

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有序介孔碳CMK-3负载离子液体催化CO2与环氧化物合成环状碳酸酯

刘春艳*,肖本能   

  1. (辽宁师范大学化学化工学院 大连 116029)
  • 收稿日期:2013-06-20 修回日期:2013-07-13 出版日期:2014-04-10 发布日期:2014-04-10
  • 通讯作者: 刘春艳,副教授; Tel:0411-82158329; E-mail:lcybeauty@163.com; 研究方向:多孔材料的制备及应用研究

Ordered Mesoporous Carbon CMK-3 Immobilized with Ionic Liquids as Efficient Catalysts for the Synthesis of Cyclic Carbonates from CO2 and Epoxides

LIU Chunyan*, XIAO Benneng   

  1. (School of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian 116029,China)
  • Received:2013-06-20 Revised:2013-07-13 Published:2014-04-10 Online:2014-04-10

摘要: 采用有序介孔碳CMK-3为载体负载咪唑类离子液体制得CMK-3-IL催化剂,用X射线衍射(XRD)、透射电子显微镜(TEM)、N2吸附、热重分析和元素分析等手段表征了催化剂样品,并考察了CMK-3-IL催化剂催化CO2与环氧丙烷合成碳酸丙烯酯的反应性能。 结果表明,离子液体被成功的负载到CMK-3载体上,CMK-3负载离子液体后孔道结构没有被破坏,但孔体积、孔径和比表面积均有所下降。 催化实验表明,在120 ℃、2 MPa的条件下反应6 h,环氧丙烷转化率达到64%,碳酸丙烯酯选择性高达99%。

关键词: 多相催化, CMK-3-IL, 固载化, 二氧化碳, 环状碳酸酯

Abstract: CMK-3-IL heterogeneous catalysts were synthesized using ordered mesoporous carbons CMK-3 as the support to immobilize imidazoles ionic liquids and applied to the synthesis of cyclic carbonate. The catalyst samples were characterized by X-ray powder diffraction(XRD), nitrogen adsorption-desorption, transmission electron microscopy(TEM), thermogravimetric analysis(TGA) and elemental analysis. The results show that the ionic liquids are grafted on the surface of the CMK-3 and the resultant hybrid materials retains mesoporous structure after immobilization. The nitrogen adsorption results indicate that pore volume, pore diameter and surface area of CMK-3-IL are slightly reduced. CMK-3-IL shows much higher catalytic activity. A 64% conversion of propylene oxide and a 99% selectivity of propylene carbonate can be achieved when the catalytic reaction is carried out at 120 ℃ under 2 MPa for 6 h.

Key words: heterogeneous catalysis, CMK-3-IL, immobilization, carbon dioxide, cyclic carbonate

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