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Modification of porous lignin with metalloporphyrin as an efficient catalyst for the synthesis of cyclic carbonates
Transition Metal Chemistry ( IF 1.7 ) Pub Date : 2019-11-12 , DOI: 10.1007/s11243-019-00363-x
Kunpeng Song , Cheng Tang , Zhijuan Zou , Yundang Wu

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 m 2 g −1 . P-(L-FeTPP)) efficiently catalyzed the cycloaddition reactions of epoxides and CO 2 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 CO 2 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.

中文翻译:

金属卟啉改性多孔木质素作为合成环状碳酸酯的有效催化剂

将二氧化碳转化为有用的化学原料是推进二氧化碳捕集和封存技术的必要发展。在这项工作中,木质素和金属卟啉的 Friedel-Crafts 反应被用于生产表面积高达 1153 m 2 g -1 的木质素基多孔有机聚合物 (P-(L-FeTPP))。P-(L-FeTPP)) 在无溶剂条件下有效催化环氧化物和 CO 2 的环加成反应,卟啉铁作为活性中心。在 1 MPa CO 2 和 70 °C 条件下,12 h 后产物收率高达 99.6%。实现了 1481 的周转数,表明该催化剂比其均相催化剂活性得多,并且是有史以来报道的最有效的木质素负载多相催化剂之一。这种将金属卟啉原位掺入木质素骨架的方法大大提高了金属催化剂的稳定性,并且 P-(L-FeTPP) 很容易回收和重复使用六次以上,催化活性没有任何显着损失。因此,这种催化剂设计有利于实际应用,包括环状碳酸酯的工业生产。
更新日期:2019-11-12
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