A Biomass-Ligand-Based Ru(III) Complex as a Catalyst for Cycloaddition of CO2 and Epoxides to Cyclic Carbonates and a Study of the Mechanism |
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| Authors: | Prof. Dr. Haifang Mao Manli Guo Hongqing Fu Dr. Kun Yin Dr. Miaomiao Jin Chaoyang Wang Prof. Dr. Yun Zhao Dr. Zhenbiao Dong Dr. Jibo Liu |
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| Affiliation: | 1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai, P. R. China;2. Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, School of Chemistry & Materials Engineering, Fuyang Normal University, 100 West Qinghe Road, Fuyang, Anhui, 236037 P. R. China |
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| Abstract: | Aiming highly efficient conversion of greenhouse gas CO2 to cyclic carbonates, a biomass Ru(III) Schiff base complex catalyst ( SalRu ) was constructed by employing a derivative of Lignin degradation (5-aldehyde vanillin). The SalRu catalyst had a remarkable conversion for epoxides into corresponding cyclic carbonates even at atmospheric pressure of CO2 without the presence of co-catalyst. As the condition at 120 °C and 2 MPa CO2 the conversion reached to 94 % with selectivity at 99 % after 8 h. 32 % cyclic carbonate production was obtained even under 0.2 MPa CO2 pressure. The epoxide activation and ring opening, CO2 insertion and cyclic carbonate formation were illuminated explicitly through the of characteristic absorption peaks changing, which further providing direct and visual evidence for the mechanism proposing. This study has important theoretical significance for the comprehensive utilization of environmental pollutants and energy. |
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| Keywords: | Carbon dioxide Cyclic carbonates Epoxides Ruthenium Structure elucidation |
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