| Acidic catalysis of microporous polyoxometalate H3PW12O40/Sio2 in acetal reaction between benzaldehyde and ethylene glycol |
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| 作者姓名： | YANG Yulin GUO Yihang WANG Yonghui HU Changwen WANG Enbo FENG Shouhua |
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| 作者单位： | Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,State Key Laboratory of Inorganic Synthesis and Preparative Chemistry' Jilin University' Changchun 130023' China |
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| 摘 要： | Microporous Keggin-type polyoxometalate material was synthesised by supporting H3PW12O40 into a silica matrix via a sol-gel technique. The silica-supported 12-tungstophosphoric acid ( H3PW12O40/Sio2 ) obtained is insoluble and readily separable porous materials with uniform micropores (0. 57 nm) and a high specific surface area (350. 5 m2/g) in oxygen-containing polar solvents. H3PW12 O4o/Si02 was characterized by infrared spectrophotometer (IR). ultraviolet-visible spectrophotometer (UV-vis). inductively coupled plasma (ICP)> thermogravimetric analysis (TGA) and Brunner-Emmett-Teller method (BET) measurements. H3PWi204o/Si02 obtained catalyzed the acetal reaction between benzaldehyde and ethylene glycol to produce 2-phenyl-l > 3-dioxolane more efficiently than the typical solid acids such as SO4 /ZrO2' Nafion-H and H-ZSM-5. Conversion was 93. 8% for benzaldehyde during the reaction period of 2 h. H3PW12O40/Sio2 kept its initial activity during three times of reuse. The initial acetal reaction follows a second-order kinetics model at 298 K.
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| 关 键 词： | silica-supported 12-tungstophosphoric acid catalyze acetal reaction. |
Acidic catalysis of microporous polyoxometalate H3PW12O40/Sio2 in acetal reaction between benzaldehyde and ethylene glycol |
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| YANG Yulin,GUO Yihang,WANG Yonghui,HU Changwen,WANG Enbo,FENG Shouhua.Acidic catalysis of microporous polyoxometalate H3PW12O40/Sio2 in acetal reaction between benzaldehyde and ethylene glycol[J].Progress in Natural Science,2002,12(2):153-157. |
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| Authors: | YANG Yulin GUO Yihang WANG Yonghui HU Changwen WANG Enbo FENG Shouhua |
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| Institution: | Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,Institute of Polyoxometalate Chemistry' Faculty of Chemistry' Northeast Normal University' Changchun 130024' China,State Key Laboratory of Inorganic Synthesis and Preparative Chemistry' Jilin University' Changchun 130023' China |
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| Abstract: | Microporous Keggin-type polyoxometalate material was synthesised by supporting H3PW12O40 into a silica matrix via a sol-gel technique. The silica-supported 12-tungstophosphoric acid ( H3PW12O40/Sio2 ) obtained is insoluble and readily separable porous materials with uniform micropores (0. 57 nm) and a high specific surface area (350. 5 m2/g) in oxygen-containing polar solvents. H3PW12 O4o/Si02 was characterized by infrared spectrophotometer (IR). ultraviolet-visible spectrophotometer (UV-vis). inductively coupled plasma (ICP)> thermogravimetric analysis (TGA) and Brunner-Emmett-Teller method (BET) measurements. H3PWi204o/Si02 obtained catalyzed the acetal reaction between benzaldehyde and ethylene glycol to produce 2-phenyl-l > 3-dioxolane more efficiently than the typical solid acids such as SO4 /ZrO2' Nafion-H and H-ZSM-5. Conversion was 93. 8% for benzaldehyde during the reaction period of 2 h. H3PW12O40/Sio2 kept its initial activity during three times of reuse. The initial acetal reaction follows a second-order kinetics model at 298 K. |
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| Keywords: | silica-supported 12-tungstophosphoric acid catalyze acetal reaction |
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