We present the use of an amine functionalized two-dimensional clay i.e., aminoclay (AC), in the chemistry of a three-dimensional metal–organic framework (MOF) i.e., MIL-101(Cr), to prepare MIL-101(Cr)/AC composites, which are exploited as catalysts for efficient conversion of CO₂ gas into cyclic carbonates under ambient reaction conditions. Three different MOF nanocomposites, denoted as MIL-101(Cr)/AC-1, MIL-101(Cr)/AC-2, and MIL-101(Cr)/AC-3, were synthesized by an in situ process by adding different amounts of AC to the precursor solutions of the MIL-101(Cr). The composites were characterized by various techniques such as FT-IR, PXRD, FESEM, EDX, TGA, N₂ adsorption, as well as CO₂ and NH₃-TPD measurements. The composites were exploited as heterogeneous catalysts for CO₂ cycloaddition reactions with different epoxides and the catalytic activity was investigated at atmospheric pressure under solvent-free conditions. Among all the materials, MIL-101(Cr)/AC-2 shows the best catalytic efficiency under the optimized conditions and exhibits enhanced efficacy compared to various MIL-101(Cr)-based MOF catalysts, which typically need either high temperature and pressure or a longer reaction time or a combination of all the parameters. The present protocol using MIL-101(Cr)/AC-2 as the heterogeneous catalyst gives 99.9% conversion for all the substrates into the products at atmospheric pressure.

中文翻译：

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MIL-101(Cr)/氨基粘土纳米复合材料用于将CO2转化为环状碳酸酯


我们提出了在三维金属有机骨架（MOF）即 MIL-101(Cr) 的化学中使用胺功能化的二维粘土（即氨基粘土（AC））来制备 MIL-101（Cr） )/AC 复合材料，可用作在环境反应条件下将 CO ₂ 气体有效转化为环状碳酸酯的催化剂。通过原位合成法合成了三种不同的 MOF 纳米复合材料，分别为 MIL-101(Cr)/AC-1、MIL-101(Cr)/AC-2 和 MIL-101(Cr)/AC-3。将不同量的 AC 添加到 MIL-101(Cr) 的前体溶液中。通过FT-IR、PXRD、FESEM、EDX、TGA、N ₂ 吸附、CO ₂ 和 NH ₃ -TPD 测量。该复合材料被用作与不同环氧化物发生CO ₂ 环加成反应的非均相催化剂，并在常压、无溶剂条件下研究了其催化活性。在所有材料中，MIL-101(Cr)/AC-2 在优化条件下表现出最佳的催化效率，并且与通常需要高温高压的各种 MIL-101(Cr) 基 MOF 催化剂相比，表现出更高的效率或更长的反应时间或所有参数的组合。本方案使用 MIL-101(Cr)/AC-2 作为多相催化剂，在大气压下所有底物转化为产物的转化率为 99.9%。