Cycloaddition of CO2 and epoxides over a porous covalent triazine-based polymer incorporated with Fe3O4†,New Journal of Chemistry

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Cycloaddition of CO2 and epoxides over a porous covalent triazine-based polymer incorporated with Fe3O4†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-06-16 00:00:00 , DOI: 10.1039/c8nj01965g
Seenu Ravi _{1,

2,

3,

4} , Pillaiyar Puthiaraj _{1,

2,

3,

4} , Dong-Wha Park _{1,

2,

3,

4} , Wha-Seung Ahn _{1,

2,

3,

4}

Affiliation

A highly porous quaterphenyl-containing covalent triazine polymer (QP-CTP) incorporated with iron oxide nanoparticles (Fe₃O₄@QP-CTP) was synthesized and applied as a catalyst for the cycloaddition of CO₂ and epoxides under mild conditions. The synthesized materials were characterized using X-ray powder diffraction, N₂ adsorption–desorption isotherm, X-ray photoelectron spectroscopy, transmission electron microscopy, and elemental analysis. The Fe₃O₄@QP-CTP composite in the presence of tetrabutylammonium bromide showed 95% conversion of epoxides with high selectivity to cyclic carbonates at 50 °C, 0.1 MPa CO₂ in 12 h. The reaction kinetics was further improved upon increasing the temperature to 80 °C. The catalyst was easily recovered using a magnet, and its stability was confirmed using a recycle test, which showed that the catalyst could be re-used for a minimum of eight consecutive runs without a noticeable decline in catalytic activity. A plausible mechanistic pathway of the cycloaddition reaction over Fe₃O₄@QP-CTP was also proposed.

中文翻译：

CO的环加成₂和环氧化物在为Fe掺入多孔共价三嗪系聚合物₃ ö ₄†

合成了掺有氧化铁纳米颗粒（Fe ₃ O ₄ @ QP-CTP）的高度多孔的含四苯基共价三嗪聚合物（QP-CTP），并将其用作在温和条件下环化CO ₂和环氧化物的催化剂。使用X射线粉末衍射，N ₂吸附-解吸等温线，X射线光电子能谱，透射电子显微镜和元素分析对合成的材料进行表征。在存在四丁基溴化铵的条件下，Fe ₃ O ₄ @ QP-CTP复合材料在50°C，0.1 MPa CO ₂的条件下显示出高选择性的95％环氧化物转化为环状碳酸酯在12小时内将温度升至80℃，反应动力学得到进一步改善。使用磁铁可以轻松回收催化剂，并通过循环测试确认了催化剂的稳定性，该测试表明该催化剂至少可以连续使用八次，而催化活性不会明显下降。还提出了在Fe ₃ O ₄ @ QP-CTP上进行环加成反应的可能机理。

更新日期：2018-06-16

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