Metal and Co‐Catalyst Free CO<sub>2</sub> Conversion with a Bifunctional Covalent Organic Framework (COF)
Hongming He, Qianqian Zhu, Wenwen Zhang, Han‐Wen Zhang, Jing Chen, Cheng‐Peng Li, Miao Du
Abstract
Abstract The excessive growth of CO 2 brings about the global warming and subsequent climate change, which is an increased public concern issue. Currently, the chemical fixation of CO 2 is identified as one of the most effective approaches to reduce and utilize CO 2 . Thus, it is a great challenge to rationally design and construct high‐efficient catalysts for CO 2 conversion and utilization. Here, a unique metal‐free bifunctional COF heterogeneous catalyst was successfully achieved via the post‐modified strategy, which simultaneously bears −COOH as Brønsted acidic center and Br − ion as nucleophilic active site. By virtue of abundant porosity, excellent stability, favorable CO 2 adsorption, and dual catalytic sites, this material can efficiently facilitate the coupling reaction of CO 2 with epoxide to form cyclic carbonate without co‐catalyst under mild conditions. Moreover, it has excellent reusability, without significant reduction of the catalytic activity after at least five cycles.