Abstract Global warming arising from the influx of excessive greenhouse gases, has highlighted the importance of reducing them from the atmosphere. Intensive efforts were made to uncover biomass-based materials that can catalyze the synthesis of cyclic carbonate from CO2 and epoxides. In this work, a biomass based catalyst system consisting of 1, 8-Diazabicyclo (5.4.0) undec-7-ene (DBU) and xylan was developed for efficient fixation of CO2 with epoxides to synthesize cyclic carbonates. The results showed that the catalyst composition, reaction time, temperature and pressure had remarkable influences on the catalytic activity of DBU/xylan. A high yield of 85% propylene carbonate (PC) was achieved under the optimal reaction conditions (DBU: xylan = 5:1, 3.0 MPa, 4 h, and 120 °C). In addition, the catalytic system could be suitable for the cycloaddition between CO2 and other epoxides or aziridines. Compared with other biomass-based catalysis system, the DBU/xylan exhibited a better catalytic activity, owing to the exceptional synergistic effect between DBU and xylan.

中文翻译：

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Xylan/DBU 作为化学固定 CO 2 的高效绿色催化剂

摘要 过量温室气体流入引起的全球变暖凸显了从大气中减少它们的重要性。为发现可催化从 CO2 和环氧化物合成环状碳酸酯的基于生物质的材料做出了大量努力。在这项工作中，开发了一种由 1, 8-二氮杂双环 (5.4.0) 十一碳-7-烯 (DBU) 和木聚糖组成的基于生物质的催化剂体系，用于用环氧化物有效固定 CO2 以合成环状碳酸酯。结果表明，催化剂组成、反应时间、温度和压力对DBU/木聚糖的催化活性有显着影响。在最佳反应条件（DBU：木聚糖 = 5:1、3.0 MPa、4 h 和 120 °C）下获得了 85% 的碳酸亚丙酯 (PC) 的高产率。此外，该催化体系可适用于 CO2 与其他环氧化物或氮丙啶之间的环加成反应。与其他基于生物质的催化体系相比，DBU/木聚糖表现出更好的催化活性，这是由于 DBU 和木聚糖之间的特殊协同作用。