The efficient CO2 fixation catalyzed by K-doped g-C3N4 catalyst for synthesizing benzimidazoles at atmospheric pressure
Xuewei Tu, Luping Zhang, Yutong Chen, Shouxin Zhu, Can Sun, Jiali Jin, Min Liu, Hui Zheng
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Abstract
The conversion of CO2 into valuable chemicals to reduce greenhouse gas emissions has received extensive attention. Converting CO2 into pharmaceutical intermediates via graphitic carbon nitride (CN) at atmospheric pressure is a challenge. In this work, a series of novel graphitic carbon nitrides (K-CN) catalysts with different doping ratios of K were synthesized by post-treatment of CN with KOH as a dopant under magnetic stirring. Herein, substrates of o -phenylenediamine with different electron-donating/withdrawing groups were employed to convert CO2 into high-value heterocyclic benzimidazoles. The optimal reaction conditions were determined by a single factor optimization approach. A series of benzimidazole derivatives were synthesized with a yield of up to 96% under atmospheric pressure, indicating that the catalyst can efficiently fix CO2 . This work not only designs a simple and low-cost K-CN catalyst but also provides a new pathway for converting CO2 into valuable benzimidazole derivatives at atmospheric pressure. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
大气压下K掺杂g-C3N4催化剂催化合成苯并咪唑的高效CO2固定
将二氧化碳转化为有价值的化学品以减少温室气体排放受到了广泛关注。在大气压下通过石墨氮化碳(CN)将CO2转化为药物中间体是一项挑战。本工作以KOH为掺杂剂,在磁力搅拌下对CN进行后处理,合成了一系列具有不同K掺杂率的新型石墨氮化碳(K-CN)催化剂。本文采用具有不同给电子/吸电子基团的邻苯二胺底物将CO2转化为高价值的杂环苯并咪唑。通过单因素优化方法确定了最佳反应条件。在常压下合成了一系列苯并咪唑衍生物,产率高达96%,表明该催化剂可以有效地固定CO2。这项工作不仅设计了一种简单、低成本的K-CN催化剂,而且为在大气压下将CO2转化为有价值的苯并咪唑衍生物提供了一条新的途径。©2023化学工业协会和John Wiley&;有限公司。
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