Abstract
The 12-phosphotungstic heteropolyacid (HPW) was immobilized on the surface of a silica carrier modified by the amine groups of organosilane γ-aminopropyl triethoxysilane (APTES), and its catalytic performance was investigated for tetrahydrofuran (THF) ring-opening polymerization. This amine-functionalized catalyst exhibited better activity, and the polytetramethylene ether glycol (PTMG) yield was 63.7%. The 12-phosphotungstic heteropolyacid supported on aminopropyl-functionalized SiO2 support (HPW/SiO2-APTES) was reused four times and showed a good maintenance of activity which was better than that of the conventional catalyst HPW supported on SiO2 (HPW/SiO2). These results were obtained using infrared spectroscopy, nuclear magnetic resonance spectroscopy, nitrogen adsorption and X-ray diffraction. HPW on the HPW/SiO2-APTES catalyst exhibited higher dispersed state and maintained a more stable structure than that of the HPW/SiO2 sample.
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Huang, M., Chu, W., Liao, X. et al. Immobilization of 12-phosphotungstic heteropolyacid on amine-functionalized SiO2 for tetrahydrofuran polymerization. Chin. Sci. Bull. 55, 2652–2656 (2010). https://doi.org/10.1007/s11434-010-3266-5
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DOI: https://doi.org/10.1007/s11434-010-3266-5