College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China.
College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China.
Carbohydr Polym. 2021 Mar 15;256:117558. doi: 10.1016/j.carbpol.2020.117558. Epub 2020 Dec 24.
Searching for green, recyclable and highly efficient catalyst for the synthesis of cyclic carbonates from CO is of great importance because it is profitable for reducing the greenhouse effects and meets the principles of green chemistry. Herein, a series of cellulose nanocrystals, either the pristine or modified ones (TEMPO oxidized and Co(III)salen immobilized), were explored as catalysts for cycloaddition of epoxides and carbon dioxide. The impact of surface properties on the performance of the as-made catalysts was investigated. Co(III)-salen grafted cellulose nanocrystals was proven to be the most effective catalyst in this study, which could afford excellent yield up to 99 % after 24 h even under low CO pressures of 0.1 MPa. They can be easily recovered and reused for at least 4 times, demonstrating their excellent stability. We found that the surface functional groups such as enriched sulfate or carboxylic groups could also account for the enhanced catalytic activity. This work highlights the applications of green and sustainable nanoparticles in a cycloaddition reaction and offers a sustainable solution in industrial catalysis related to CO conversions.
寻找绿色、可回收且高效的催化剂，用于从 CO 合成环状碳酸酯具有重要意义，因为它有利于减少温室效应，符合绿色化学的原则。本文中，我们探索了一系列纤维素纳米晶体，包括原始的或修饰的纤维素纳米晶体（TEMPO 氧化和 Co(III)salen 固载），将其作为环加成反应中环氧和二氧化碳的催化剂。考察了表面性质对所制备催化剂性能的影响。在这项研究中，Co(III)-salen 接枝纤维素纳米晶体被证明是最有效的催化剂，即使在低 CO 压力（0.1 MPa）下，24 小时后也能提供高达 99%的优异产率。它们可以很容易地回收并重复使用至少 4 次，表现出优异的稳定性。我们发现，表面功能基团，如富含硫酸盐或羧酸基团，也可以解释其增强的催化活性。这项工作突出了绿色可持续纳米粒子在环加成反应中的应用，并为与 CO 转化相关的工业催化提供了可持续的解决方案。
