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.

将二氧化碳 (CO ₂ )转化为增值产品对于对抗全球变暖势在必行。在这方面，我们在此报告了一种无金属多相催化剂、硼掺杂的石墨氮化碳，用于在无溶剂条件下在常压下将 CO ₂有效转化为环状碳酸酯。所开发的催化剂具有酸碱双重功能作为活性位点，可同时活化环氧化物和 CO ₂同时进行环加成反应。该催化剂的最大产率高达 99%，周转数为 173。已经进行了详细的优化研究，通过改变反应时间、温度和催化剂用量来找出硼的最佳掺杂含量和最佳条件。此外，催化剂易于回收和出色的可回收性证明了该催化剂在温和条件下选择性和有效地将 CO ₂转化为环状碳酸酯的可持续性和多功能性。