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首页> 外文期刊>ChemSusChem >Design of Zeolitic Imidazolate Framework Derived Nitrogen-Doped Nanoporous Carbons Containing Metal Species for Carbon Dioxide Fixation Reactions
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Design of Zeolitic Imidazolate Framework Derived Nitrogen-Doped Nanoporous Carbons Containing Metal Species for Carbon Dioxide Fixation Reactions

机译：烧氮酰胺骨库衍生氮掺杂纳米多孔碳含有金属物种的二氧化碳固定反应

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摘要

Various N-doped nanoporous carbons containing metal species were prepared by direct thermal conversion of zeolitic imidazolate frameworks (ZIFs; ZIF-7, -8, -9, and -67) at different temperatures (600, 800, and 1000 degrees C). These materials were utilized as bifunctional acid-base catalysts to promote the reaction of CO2 with epoxides to form cyclic carbonates under 0.6MPa of CO2 at 80 degrees C. The catalyst generated by thermal conversion of ZIF-9 at 600 degrees C (C600-ZIF-9) was found to exhibit a higher catalytic activity than the other ZIFs, other conventional catalysts, and other metal-organic framework catalysts. The results of various characterization techniques including elemental analysis, X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and transmission electron microscopy show that C600-ZIF-9 contains partly oxidized Co nanoparticles and N species. Temperature-programmed desorption measurements by using CO2 and NH3 as probe molecules revealed that C600-ZIF-9 has both Lewis acid and Lewis base catalytic sites. Finally, the substrate scope was extended to seven other kinds of epoxides.
机译：通过在不同温度（600,800和1000℃）的沸石咪唑酯骨架（Zifs; ZIF-7，-8，-9和-67）直接热转化制备含有金属物质的各种N掺杂的纳米多孔碳。这些材料用作双官能酸碱催化剂，以促进CO 2与环氧化物的反应，以在80℃下在0.6MPa的CO 2下形成环状碳酸盐。通过ZIF-9的热转化为600℃（C600-ZIF）产生的催化剂发现-9）表现出比其他Zifs，其他常规催化剂和其他金属 - 有机骨架催化剂更高的催化活性。各种表征技术的结果包括元素分析，X射线衍射，X射线光电子能量，X射线吸收光谱和透射电子显微镜，表明C600-ZIF-9含有部分氧化的CO纳米颗粒和N种。通过使用CO 2和NH 3作为探针分子的温度编程的解吸测量显示C600-ZIF-9具有路易斯酸和Lewis碱催化位点。最后，基质范围延伸到七种其他环氧化物。

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