Metal and Co‐Catalyst Free CO2 Conversion with a Bifunctional Covalent Organic Framework (COF),ChemCatChem

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Metal and Co‐Catalyst Free CO2 Conversion with a Bifunctional Covalent Organic Framework (COF)
ChemCatChem ( IF 3.8 ) Pub Date : 2020-06-23 , DOI: 10.1002/cctc.202000949
Hongming He ₁ , Qian‐Qian Zhu ₁ , Wen‐Wen Zhang ₁ , Han‐Wen Zhang ₁ , Jing Chen ₁ , Cheng‐Peng Li ₁ , Miao Du _{1,

2}

Affiliation

The excessive growth of CO₂ brings about the global warming and subsequent climate change, which is an increased public concern issue. Currently, the chemical fixation of CO₂ is identified as one of the most effective approaches to reduce and utilize CO₂. Thus, it is a great challenge to rationally design and construct high‐efficient catalysts for CO₂ 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 CO₂ adsorption, and dual catalytic sites, this material can efficiently facilitate the coupling reaction of CO₂ 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.

中文翻译：

具有双功能共价有机框架（COF）的金属和助催化剂的无CO2转化

CO ₂的过度增长导致全球变暖和随后的气候变化，这是一个日益引起公众关注的问题。当前，CO ₂的化学固定被认为是减少和利用CO ₂的最有效方法之一。因此，合理设计和构建用于CO ₂转化和利用的高效催化剂是一个巨大的挑战。这里，独特的不含金属的双功能COF多相催化剂被成功通过后改性策略，同时带有-COOH作为布朗斯台德酸性中心和Br实现^-离子作为亲核活性位点。孔隙率高，稳定性好，CO ₂有利这种材料具有良好的吸附和双重催化作用，可在温和条件下有效地促进CO ₂与环氧化物的偶联反应，形成环碳酸酯，而无需助催化剂。而且，它具有极好的可重复使用性，在至少五个循环后没有显着降低催化活性。

更新日期：2020-06-23

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