Fe3O4@SiO2 nanoparticle-supported Co(III)-Salen composites as recyclable heterogeneous catalyst for the fixation of CO2. Issue 24 (15th December 2021)

• Record Type: Journal Article
• Authors: Min, Jie; Song, Wei; Hu, Tianding; Zhi, Yunfei; Xia, Zhenhao; Zhang, Tiecheng; Shan, Shaoyun; Su, Hongying
• Is Part Of: Ceramics international. Volume 47:Issue 24(2021)
• Page Start: 35320
• Page End: 35332
• Publication Date: 2021-12-15
• Subjects: Fe3O4 nanoparticles -- Magnetic heterogeneous nanocatalyst -- CO2 conversation -- Cyclic carbonates -- Density functional theory calculations; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.09.075
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Magnetic nanoparticle-supported heterogeneous catalysts have been widely researched in green catalysis, due to their convenient magnetic separation and nanometer effects. Herein, a magnetic Co(III)-Salen heterogeneous catalyst with uniform spherical core-shell structure was synthesized for the chemical fixation of CO2 into cyclic carbonate based on the sustainable protocol development and green chemistry principles. Fe3 O4 @SiO2 nanoparticles with uniform spherical core-shell structure were prepared by the reverse microemulsion method, and Co(III)-Salen complexes were subsequently immobilized on the resulted Fe3 O4 @SiO2 nanoparticles via covalent bonding, leading to Fe3 O4 @SiO2 @Co(III)-Salen nanocomposites with particle size of 29 nm and saturation magnetization value of 27.2 emu/g. The catalytic performance study indicated that the catalyst exhibited high yield of 99% with selectivity of 100% for the ring-opening addition reaction of CO2 and epoxide under solvent-free reaction condition. A plausible reaction mechanism was proposed that the Lewis acidic sites of Co(III)-Salen and nucleophilic bromine ion components played synergetic roles in promoting cycloaddition reactions. A stable geometry of the Co(III)-Salen complex and a detailed evidence for the reaction mechanism were provided by the density functional theory (DFT) calculations. Based on their excellent magnetic properties, the Co(III)-Salen nanocomposites could be easily recovered by using an external magnet and reused for 5 times without significant leaching of metal center and loss of catalytic activity.