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Bifuctional metal-doped ZIF-8: a highly efficient catalyst for the synthesis of cyclic carbonates from CO2 cycloaddition
Microporous and Mesoporous Materials ( IF 5.2 ) Pub Date : 2020-02-26 , DOI: 10.1016/j.micromeso.2020.110123
Lihua Hu , Li Chen , Xiong Peng , Jianwei Zhang , Xiaohong Mo , Yuanjing Liu , Zongcheng Yan

The acid-base properties of ZIF-8 are successfully tuned by doping different transition metal ions into the crystalline lattice, for their effects on the catalytic activity of the CO2 cycloaddition reaction. The as-synthesized metal-doped ZIF-8 samples maintain rhombic dodecahedral morphology, high specific surface areas and high thermal stability of pure ZIF-8. Coexistence of acidic and basic sites allowed metal-doped ZIF-8 to be a highly efficient heterogeneous catalyst for the CO2 cycloaddition reaction without co-catalyst and solvent. Both weak and moderate acid/base sites are active sites for cycloaddition reaction, but the weak acid/base sites contribute more to the increase in catalytic activity. Fe/ZIF-8 catalyst shows the best catalytic activity among the metal-doped ZIF-8 samples tested with a 96.6% yield of cyclic carbonate, attributed to its large amount of weak acid/base sites. Correlation between acid-base characteristics and catalytic activities has been established, which is of great significance for the development of catalysts for CO2 cycloaddition.



中文翻译:

双功能金属掺杂ZIF-8:从CO 2环加成反应合成环状碳酸酯的高效催化剂

通过将不同的过渡金属离子掺杂到晶格中,成功地调节了ZIF-8的酸碱性质,因为它们对CO 2环加成反应的催化活性有影响。合成后的金属掺杂ZIF-8样品保持纯正ZIF-8的菱形十二面体形态,高比表面积和高热稳定性。酸性和碱性位点的共存使掺杂金属的ZIF-8成为CO 2的高效多相催化剂无需助催化剂和溶剂的环加成反应。弱酸/碱位均是环加成反应的活性位,但是弱酸/碱位对催化活性的增加贡献更大。Fe / ZIF-8催化剂在金属掺杂的ZIF-8样品中显示出最佳的催化活性,其中环状碳酸酯的收率为96.6%,这归因于其大量的弱酸/碱位。建立了酸碱特性与催化活性之间的相关性,这对开发CO 2环加成催化剂具有重要意义。

更新日期:2020-02-26
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