Atmospheric pressure conversion of carbon dioxide to cyclic carbonates using a metal-free Lewis acid-base bifunctional heterogeneous catalyst
Atmospheric pressure conversion of carbon dioxide to cyclic carbonates using a metal-free Lewis acid-base bifunctional heterogeneous catalyst
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DOI：
10.1016/j.jcou.2021.101646
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发表时间：
2021-07-15
影响因子：
7.7
通讯作者：
Krishnan, Venkata
中科院分区：
文献类型：
--
作者：
Chand, Hushan;Choudhary, Priyanka;Krishnan, Venkata
将二氧化碳（CO2）转化为增值产品是对抗全球变暖的必要条件。在这方面，本文报道了一种无金属的非均相催化剂，硼掺杂石墨氮化碳在无溶剂条件下在常压下有效地将CO2转化为循环碳酸盐。所研制的催化剂具有酸碱双官能团作为活性位点，可同时激活环氧化物和CO2进行环加成反应。该催化剂的收率最高可达99%，周转数为173。通过改变反应时间、温度和催化剂用量，对硼的最佳掺杂量和最佳条件进行了详细的优化研究。此外，催化剂易于回收和良好的可回收性证明了催化剂在温和条件下选择性和有效地将CO2转化为环状碳酸盐的可持续性和多功能性。
Conversion of carbon dioxide (CO2) to value-added products is imperative to combat global warming. In this regard, herein we report a metal-free heterogeneous catalyst, boron-doped graphitic carbon nitride for effective conversion of CO2 to cyclic carbonates at atmospheric pressure under solvent-free conditions. The developed catalyst possesses acid-base dual functionality as active sites, which activate both epoxides as well as CO2 simultaneously to carry out the cycloaddition reaction. The catalyst showed a maximum yield up to 99 % with a turnover number of 173. Detailed optimization studies have been performed to find out the best doping content of boron and best conditions by varying the reaction time, temperature and catalysts amount. Furthermore, the ease of catalyst recovery and excellent recyclability demonstrate the sustainability and versatility of the catalyst for selective and efficient conversion of CO2 to cyclic carbonates at mild conditions.