Synthesis and Activity of Heteropolysilicotungstate Containing Transition Metal Elements

Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (1): 16.

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Synthesis and Activity of Heteropolysilicotungstate Containing Transition Metal Elements

WU Zhi-Yun, WANG Jun, ZHAO Zhong-Qing

Department of Chemtry, Jilin Utuvernty, Chamgchan, 130023

Received:1992-03-17 Revised:1992-05-26 Online:1993-01-24 Published:1993-01-24

Abstract

Abstract: The heteropolysilicotungstates containing transition metal elements Mn²⁺, Co²⁺ and Ni²⁺ were synthesized.IRspectra and TPDof the samples adsorbing pyrMine were determined.The IRspectra of the heteropoly compounds are different from those of 12-silicotungtic acid and its potassium salt; the adsorption peak at 1438 cm^-1 is visible, even if the sample was treated for 1 h at 200℃ under 0.5 Pa vacuum.The result implies that Lewis acid site exists in the compound.The acid site corresponds to the medium temperature peak on TPDpattern of the compoud adsorbing pyridine.

Key words: HeteropolyslJicotungstate, Transition element, Acidity

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WU Zhi-Yun, WANG Jun, ZHAO Zhong-Qing. Synthesis and Activity of Heteropolysilicotungstate Containing Transition Metal Elements[J]. Chem. J. Chinese Universities, 1993, 14(1): 16.

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Synthesis and Activity of Heteropolysilicotungstate Containing Transition Metal Elements

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