Modification of porous lignin with metalloporphyrin as an efficient catalyst for the synthesis of cyclic carbonates
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The conversion of carbon dioxide into useful chemical raw materials is a necessary development for advancing carbon dioxide capture and storage technology. In this work, a Friedel–Crafts reaction of lignin and metalloporphyrin was used to produce a lignin-based porous organic polymer (P-(L-FeTPP)) with a surface area of up to 1153 m2 g−1. P-(L-FeTPP)) efficiently catalyzed the cycloaddition reactions of epoxides and CO2 under solvent-free conditions, with porphyrin iron acting as an active center. The product yield reached up to 99.6% after 12 h under 1 MPa CO2 and 70 °C. A turnover number of 1481 was achieved, indicating that this catalyst is much more active than its homogeneous counterpart and is one of the most efficient lignin-supported heterogeneous catalysts ever reported. This method for the in situ incorporation of a metalloporphyrin into a lignin skeleton greatly improved the stability of the metal catalyst, and P-(L-FeTPP) was readily recycled and reused more than six times without any significant loss of catalytic activity. Thus, this catalyst design is promising for practical applications, including the industrial production of cyclic carbonates.
This work was financially supported by the National Natural Science Foundations of China (41701305), the Science and Technology Planning Project of Guangdong Province (2017B030314092), Science and Technology Foundation of Sichuan Province (2017JY0015), the Fundamental Research Funds of CWNU (17C038) and the Meritocracy Research Funds of CWNU (17Y031).