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Abstract
CO2, the main greenhouse gas, has received considerable attention due to environmental issues. From a scientific perspective, CO2 as a cheap and abundant carbon source, could be applied in synthesizing more valuable chemicals such as urea, formic acid, and cyclic carbonates. However, the high bond energy of C Created by potrace 1.16, written by Peter Selinger 2001-2019 ]]> O (750 kJ mol−1) and the non-polarity property make CO2 molecules difficult to activate. In this paper, we have carefully designed a low-cost, stable and, most importantly, highly efficient Co-based heterocatalyst Co@NxC functionalized by nitrogen-doped carbon to activate CO2 molecules and convert it into cyclic carbonates. The CO2 conversion process could be triggered at very mild conditions (60 °C and 1 bar CO2). We carefully adjusted the nitrogen content in the carbon support to enhance the catalytic performance of Co centers via the interface effect. Consequently, the optimal catalyst displayed extraordinary activity toward the cycloaddition of CO2 with styrene oxide as high conversion (92%) and selectivity (>99%) were achieved in 4 h without byproducts.
Highlights
A technical difficulty of such process comes from the inert chemical nature of CO2, in which the reduction of CO2 to useful chemicals demands harsh conditions to activate CO2 molecules to undergo subsequent chemistry.[9,10]
The electron-de cient state of Co centers functionalized by the nitrogen-doped carbon displayed excellent catalytic performance toward the CO2 cycloaddition with epoxides as 92% conversion and almost 100% selectivity of the target product achieved at 4 h (60 C and 1 atm CO2 gas), and the general applicability and recycling test showed the potential application value
We believed that this work provided a new idea to develop the highly efficient heterocatalysts and advanced the scienti c research toward CO2 related issues
Summary
An easy cure of CO2 greenhouse gas problem is chemical xation, which has high selectivity and good conversion yields.[16]. The assurance of high gas permittivity and catalysis activity requires a high speci c inner surface area on which the catalysts should reside. The cost-effective concerns and separation simplicity call for a conventional material framework that is readily accessible, as well; as construction of new catalytic system in one-pot synthesis. These guidelines narrow the focus of mesoporous carbon materials, on which an inexpensive metal catalyst particles can be decorated in a hierarchical manner, providing an effective surface area and 42408 | RSC Adv., 2020, 10, 42408–42412
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