Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), No. 444, Prof. Yousef Sobouti Boulevard, Zanjan, 45137-66731, Iran.
Research Center for Basic Sciences & Modern Technologies (RBST), Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran.
Sci Rep. 2023 Apr 4;13(1):5521. doi: 10.1038/s41598-023-32647-9.
Lanthanum(III) supported on the magnetic mesoporous organosilica nanoparticle (La@MON) has been described as an efficient, simple, and durable heterogeneous catalyst for the synthesis of 5-membered cyclic carbonates from carbon dioxide (CO) and epoxides. Under optimized reaction conditions, various terminal epoxides have been converted to the corresponding carbonates in the presence of 0.3 mol% La@MON and 0.5 mol% tetrabutylammonium iodide (TBAI) as co-catalyst at relatively mild reaction conditions. It was also found that La@MON catalysts had significantly higher catalytic activity than some selected reference catalysts, which can be explained by the abundance of lanthanum(III) species acting as Lewis acidic sites for activating both carbon dioxide and epoxide molecules, along with the fact that the catalyst channels are short and provided facile mass transfer. The catalyst showed good reusability for at least five reaction cycles while the magnetic core of the catalyst helps the easy separation of the catalyst by just using an external magnet.
镧（III）负载在磁性介孔有机硅纳米颗粒（La@MON）上已被描述为一种高效、简单和耐用的多相催化剂，可用于将二氧化碳（CO）和环氧化物合成五元环状碳酸酯。在优化的反应条件下，各种末端环氧化物在 0.3 mol%La@MON 和 0.5 mol%四丁基碘化铵（TBAI）作为共催化剂的存在下，在相对温和的反应条件下转化为相应的碳酸酯。还发现，La@MON 催化剂的催化活性明显高于一些选定的参考催化剂，这可以通过大量的镧（III）物种作为路易斯酸性位来解释，这些路易斯酸性位可以同时活化二氧化碳和环氧化物分子，并且催化剂通道较短，有利于传质。该催化剂在至少五个反应循环中表现出良好的可重复使用性，而催化剂的磁性核有助于通过使用外部磁铁轻松分离催化剂。
