Citation: ZHANG Po, HUANG Ming, CHU Wei, LUO Shi-Zhong, LI Tong. Effect of Silver Content on Catalytic Performances of SiO₂-Supported Silver Tungstophoric Acid for the Synthesis of Polytetrahydrofuran[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201301152 shu

Effect of Silver Content on Catalytic Performances of SiO₂-Supported Silver Tungstophoric Acid for the Synthesis of Polytetrahydrofuran

1.
Department of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China

Received Date: 8 November 2012
Available Online: 15 January 2013
Fund Project: 国家自然科学基金(20776089) (20776089)国家科技支撑计划(2010BAC67B02)资助项目 (2010BAC67B02)

A series of supported silver salts of heteropolyacid Ag_xH_3-xPW/SiO₂ (x=0.5, 1.0, 1.5, 2.0, 2.5, 3.0) were synthesized and showed high reactivity and stability in tetrahydrofuran polymerization, which were due to the salts' insolubility in polar solvent. The amount of Ag ion replaced in the salt and the amount of the salt loaded on the silica significantly influenced the catalytic performance. Change in the Ag content of the supported silver salt altered the crystal phase composition of the silver tungstophoric acid and catalyst's acid strength. The Ag_xH_3-xPW/SiO₂ catalyst had the highest acid strength and the highest polymerization activity when x=2.0. When the Ag₂HPW loading was 30% (mass fraction), the catalyst exhibited the best dispersion and highest activity for the polymerization of tetrahydrofuran. Compared with the conventional silica supported heteropolyacid (HPW/SiO₂) catalyst, the present 30%Ag₂HPW/SiO₂ displayed excellent reusability, with its reactivity only slightly declining after 4 reuses. Through the introduction of the Ag ion, the stability of the novel supported 30%Ag₂HPW/SiO₂ was significantly improved and the obtained polymer product, polytetrahydrofuran, had a stable average molecular weight.
- Polytetrahydrofuran,
- Supported catalyst,
- Silver salt,
- Tungstophoric acid,
- Reusability
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Silver Content on Catalytic Performances of SiO2-Supported Silver Tungstophoric Acid for the Synthesis of Polytetrahydrofuran

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通讯作者: 陈斌, bchen63@163.com

Effect of Silver Content on Catalytic Performances of SiO₂-Supported Silver Tungstophoric Acid for the Synthesis of Polytetrahydrofuran