Catalytic Non-redox Carbon Dioxide Fixation in Cyclic Carbonates
作者:Saravanan Subramanian、Julius Oppenheim、Doyun Kim、Thien S. Nguyen、Wahyu M.H. Silo、Byoungkook Kim、William A. Goddard、Cafer T. Yavuz
DOI:10.1016/j.chempr.2019.10.009
日期:2019.12
selectivity for a range of substrates under ambient conditions and without the need for co-catalysts, metals, solvent, or pressure. COP-222 is recyclable and has been demonstrated to retain complete retention of activity for over 15 cycles. Moreover, it is scalable to at least a kilogram scale. We determined the reaction mechanism by using quantum mechanics (density functional theory), showing that it involves
AbstractA series of highly active organoboron catalysts for the coupling of CO2 and epoxides with the advantages of scalable preparation, thermostability, and recyclability is reported. The metal‐freecatalysts show high reactivity towards a wide scope of cycliccarbonates (14 examples) and can withstand a high temperature up to 150 °C. Compared with the current metal‐free catalytic systems that use
摘要一系列用于CO偶联的高活性有机硼催化剂2报道了具有可规模化制备、热稳定性和可回收性优点的环氧化物。无金属催化剂对多种环状碳酸酯(14 个示例)表现出高反应性,并且可以承受高达 150 °C 的高温。与目前使用mol%催化剂负载量的无金属催化体系相比,在存在以下物质的情况下,本文所述的催化剂的催化能力可以提高三个数量级(环氧化物/催化剂=200 000/1,摩尔比)助催化剂。这一特性极大地缩小了无金属催化剂和最先进的金属体系之间的差距。在晶体结构、结构-性能关系、动力学研究和关键反应中间体研究的基础上,提出并验证了分子内协同机制。
Rosin-based porous heterogeneous catalyst functionalized with hydroxyl groups and triazole groups for CO2 chemical conversion under atmospheric pressure condition
作者:Shilin Lai、Jinbin Gao、Xingquan Xiong
DOI:10.1016/j.reactfunctpolym.2021.104976
日期:2021.8
recyclable heterogeneous catalysts for the chemicalconversion of CO2 into cyclic carbonates with excellent yields under atmospheric pressure condition is still a very challenging task. Herein, a class of biomass-derived hyper-cross-linked porous heterogeneous catalysts MPAc-Br and MPAc-OH-Br, based on easily available and sustainable rosin, was synthesized by Friedel–Crafts polymerization and the further N-alkylation
开发高效、绿色和可回收的多相催化剂,用于在常压条件下将 CO 2化学转化为环状碳酸酯并具有优异的产率,仍然是一项非常具有挑战性的任务。在此,基于易得且可持续的松香,通过 Friedel-Crafts 聚合和三唑基团的进一步N-烷基化合成了一类生物质衍生的超交联多孔多相催化剂 MPAc-Br 和 MPAc-OH-Br。. 与MPAc-Br相比,双功能催化剂MPAc-OH-Br(带有三唑IL基团和-OH基团)对CO 2 的直接化学转化表现出更高的催化活性在无金属、无溶剂和大气压条件下转化为环状碳酸酯(产率高达 99%)。MPAc-OH-Br 表面的松香基多孔分子结构和双官能团在优化条件下促进 CO 2与环氧化物的环加成反应中发挥了非常重要的作用。此外,MPAc-OH-Br 表现出良好的稳定性和可重复使用性(10 次循环后产率为 96%)。
Mn
<sup>III</sup>
Porphyrins: Catalytic Coupling of Epoxides with CO
<sub>2</sub>
under Mild Conditions and Mechanistic Considerations
作者:Jorge L. S. Milani、Alexandre M. Meireles、Werberson A. Bezerra、Dayse. C. S. Martins、Danielle Cangussu、Rafael P. das Chagas
DOI:10.1002/cctc.201900745
日期:2019.9.5
epoxides using tetrabutylammonium bromide as a nucleophile source. Mechanistic considerations were inferred from electronic spectra and spectrophotometric titrations, showing that there are a series of equilibriums involved in the formation of the catalytic active species. Stability constants for the proposed equilibrium models were determined using SQUAD software. A catalytic cycle has been proposed
Quaternary ammonium salt grafted nanoporous covalent organic polymer for atmospheric CO2 fixation and cyclic carbonate formation
作者:Doyun Kim、Saravanan Subramanian、Damien Thirion、Youngdong Song、Aqil Jamal、Mona S. Otaibi、Cafer T. Yavuz
DOI:10.1016/j.cattod.2020.03.050
日期:2020.10
and very high conversion yields in atmospheric pressure catalysis for cyclic carbonate formation from CO2 and epoxides. The reaction proceeded without additives or co-catalysts, and tolerant for a wide substrate scope. We found that the steric hindrance of the alkyl units on ammonium salts affect microporosity, CO2 binding and the kinetics of cycloaddition reactions. The catalysts were also recyclable