Cationic organobismuth complex as an effective catalyst for conversion of CO2 into cyclic carbonates |
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Authors: | Xiaowen Zhang Weili Dai Shuangfeng Yin Shenglian Luo Chak-Tong Au |
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Institution: | 1. College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China 2. Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
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Abstract: | In order to achieve high-efficiency conversion of CO2 into valuable chemicals, and to exploit new applications of organobismuth compounds, cationic organobismuth complex with 5,6,7,12-tetrahydrodibenzc,f]1,5] azabismocine framework was examined for the first time for the coupling of CO2 into cyclic carbonates, using terminal epoxides as substrates and tetrabutylammonium halide as co-catalyst in a solvent-free environment under mild conditions. It is shown that the catalyst exhibited high activity and selectivity for the coupling reaction of CO2 with a wide range of terminal epoxide. The selectivity of propylene carbonates could reach 100%, and the maximum turnover frequency was up to 10740 h?1 at 120°C and 3 MPa CO2 pressure when tetrabutylammonium iodide was used as co-catalyst. Moreover, the catalyst is environment friendly, resistant to air and water, and can be readily reused and recycled without any loss of activity, demonstrating a potential in industrial application. |
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