On the way toward a sustainable low-carbon future, in addition to physical capture and permanent underground deposition of anthropogenic emitted CO₂, an alternative and very attractive way should be carbon fixation via catalytic chemical conversion of CO₂ into value-added chemicals and reusable materials. A metal–organic framework (MOF) incorporating accessible nitrogen-rich groups and unsaturated metal sites was successfully constructed via solvothermal assembly of an acylamide-containing tetracarboxylate ligand and Cu(II) ions. Characterizations including structural analysis, gas adsorption, and Raman spectral detection were carried out to reveal that the MOF presents not only a high porosity with exposed Lewis acid metal sites but also a high CO₂-adsorbing capability. Such inherent structural features make the MOF a highly promising candidate as a heterogeneous catalyst for CO₂ chemical conversion, which was confirmed by its high efficiency on the CO₂ cycloaddition with small-sized epoxides. Due to the size control of the open porous windows, catalytic activity of the MOF shows a sharp difference between small and large epoxides. Remarkably high efficiency and size selectivity on CO₂ catalytic conversion enable the MOF to be an advanced heterogeneous catalyst for carbon fixation.

中文翻译：

---

含酰胺基金属-有机骨架通过催化转化CO ₂进行高效固碳

在走向可持续的低碳未来的道路上，除了物理捕获和人为排放的CO _2的永久地下沉积外，另一种非常有吸引力的方法应该是通过将CO ₂催化化学转化为增值化学品并可重复使用来固碳。材料。通过溶剂热组装含酰基酰胺的四羧酸盐配体和Cu（II）离子，成功构建了包含可利用的富氮基团和不饱和金属位点的金属-有机骨架（MOF）。进行了包括结构分析，气体吸附和拉曼光谱检测在内的表征，结果表明，MOF不仅在暴露的路易斯酸金属位点处具有高孔隙率，而且还具有高CO ₂含量吸附能力。此类固有的结构特征使MOF成为CO ₂化学转化的非均相催化剂的高度有前途的候选者，这已被MOF与小尺寸环氧化物在CO ₂环加成反应中的高效率所证实。由于打开的多孔窗的尺寸控制，MOF的催化活性显示出大和小环氧化物之间的明显差异。在CO ₂催化转化方面具有显着的高效率和尺寸选择性，使MOF成为用于碳固定的高级多相催化剂。