银含量对二氧化硅固载磷钨酸银催化四氢呋喃聚合反应性能的影响

doi:10.3866/PKU.WHXB201301152

Abstract

Abstract:

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.

Key words: Polytetrahydrofuran, Supported catalyst, Silver salt, Tungstophoric acid, Reusability

MSC2000:

O643

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 Phys. -Chim. Sin., 2013, 29(04): 770-776.

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

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