Easily Separated and Recyclable Amino-functionalized PorousSiO2 Beads with 3D Continuous Meso/Macropore Channels |
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Authors: | WANG Qi YANG Xiaohui JIANG Yanqiu HUO Hang LI Defeng LIN Kaifeng XU Xianzhu |
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Institution: | 1. MⅡT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150090, P. R. China;
2. Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education, Nankai University, Tianjin 300071, P. R. China |
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Abstract: | Amino-functionalized porous SiO2 beads with a diameter of 200—800 μm(PSB-NH2) have been successfully synthesized by grafting 3-aminopropyl-triethoxysilane onto meso/macroporous silica beads(PSB), in which the PSB was prepared by hydrothermal synthetic method with a porous hard template anion-exchange resin. The as-prepared materials were characterized by means of nitrogen sorption and transmission electron micrographs(TEM), showing the presence of 3D interconnected and continuous large mesopores and macropores inside. The beads were used to catalyze Knoevenagel condensation and proved to be highly active and selective due to the high accessibility of the reactants to the amino groups via the continuous 3D meso/macopores. Notably, such material in bead format facilitates the extremely straightforward separation from reaction solution without any centrifugation or filtration. Moreover, PSB-NH2 proved to be a stable catalyst via leaching experiment test, and can be easily recovered and reused without significant loss of activity in successive catalytic cycles. |
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Keywords: | Amino group Porous SiO2 bead Continuous 3D meso/macropore Knoevenagel condensation Straightfor-ward separation |
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