Uniform Core–Shell Microspheres of SiO<sub>2</sub>@MOF for CO<sub>2</sub> Cycloaddition Reactions
Chen‐Yen Tsai, Yi‐Hsuan Chen, Szetsen Lee, Chia‐Her Lin, Chu-Han Chang, Wan‐Ting Dai, Wan‐Ling Liu
Abstract
A SiO2@MOF core–shell microsphere for environmentally friendly applications was introduced in this study. Several types of metal–organic framework core–shell microspheres were successfully synthesized. To achieve high stability and favorable catalytic performance, modification and coating methods were necessary for optimization. The improved SiO2@MOF core–shell microspheres were used in the cycloaddition reaction of carbon dioxide and propylene oxide. Dispersion ability was enhanced by the addition of core–shell microspheres, which also produced high catalytic activity. Accompanied with tetrabutylammonium bromide as a co-catalyst, SiO2@ZIF-67 had a maximum conversion of 97%, and the results revealed that SiO2@ZIF-67 could be used for 5 reaction cycles while maintaining high catalytic performance. This recycling catalyst was also reacted with a series of terminal epoxides to form corresponding cyclic carbonates with high conversion rates, indicating that SiO2@MOF core–shell microspheres exhibit promise in the field of catalysis.