An integrated process of CO<sub>2</sub>capture and in situ hydrogenation to formate using a tunable ethoxyl-functionalized amidine and Rh/bisphosphine system
An integrated process of CO2 capture and in situ hydrogenation into formate was achieved in 95–99% yield using a tunable ethoxyl-functionalized amidine and Rh/bisphosphine system, being regarded as an alternative carbon capture and utilization approach to supply fuel-related products, to circumvent the energy penalty in carbon capture and storage. CO2 was captured by non-volatile amidine derivatives with simultaneous activation to form zwitterionic amidinium carbonate, and subsequent hydrogenation was facilitated by Rh/bisphosphine. The adsorption capacity and hydrogenation efficiency can be optimized by tuning the ethoxyl side chain. Particularly, the alkanolamidine bearing an intramolecular hydrogen donor derived from 1,8-diazabicyclo[5.4.0]-undec-7-ene (DBU) gave both a high CO2 uptake (molar ratio of 0.95 : 1) and excellent hydrogenation yield (99%). Furthermore, the silica-supported alkanolamidine was readily recovered and reused with the retention of good performance. This kind of carbon capture and utilization pathway could be a potential energy-saving option for industrial upgrading of CO2 from waste to fuel-related products in a carbon neutral manner.
The hydrogenation of carbondioxide into formic acid (FA) with Earth-abundant metals is a vibrant research area because FA is an attractive molecule for hydrogen storage. We report a cyclopentadienyl iron tricarbonyl complex that provides up to 3000 turnover number for carbondioxidehydrogenation when combined with a catalytic amount of the chromium dicarboxylate MOF MIL-53(Cr). To date, this is the
DABCO‐Catalysed [3+2] Cyclization/Deformylation Cascade of
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‐Quinols with 3‐Formylchromones: Access to Benzopyrone‐Fused Tetracyclic Ring Systems
The construction of benzopyrone-fused hydrobenzofuranones via DABCO-catalyzed [3+2] cyclization/deformylationcascade of p-quinols with 3-formylchromones is described. The reaction works under mild reaction conditions to provide the desired products in 53–90% yields with complete diastereoselectivities. In addition, an enantioselective version with 81% ee is also realized in the presence of Takemoto's
An all-aqueous and phosphine-free integrated amine-assisted CO<sub>2</sub> capture and catalytic conversion to formic acid
作者:Ritu Bhardwaj、Abhishek Kumar、Joyanta Choudhury
DOI:10.1039/d2cc03861g
日期:——
efficient catalytic system is developed for integrated CO2 capture with tetramethylguanidine as a capturing agent and conversion to formate with H2 gas, conducting both the steps in water, affording product yield up to 85% and TON up to 19 171 in just 12 h. In the segment of “integrated CO2-capture and conversion to formate”, this system represents not only the first phosphine-free module, but also one of
开发了一种基于无膦 Ir( III )-NHC 的高效催化体系,用于以四甲基胍为捕集剂集成 CO 2捕集并用 H 2气转化为甲酸盐,在水中进行这两个步骤,产品收率高达 85 % 和 TON 在短短 12 小时内达到 19 171。在“集成CO 2捕获和转化为甲酸盐”领域,该系统不仅代表了第一个无磷化氢模块,而且是少数最知名的均相催化剂之一。