Preparation of caesium-substituted phosphomolybdic acid via solid-state ion exchange method

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• 作者：Bahaa M. Abu-Zied ; Abeer A.A. Farrag ; Abdullah M. Asiri
• 关键词：Cs3PMo12O40 ; (NH4)3PMo12O40 ; Heteropoly compounds ; Polyoxometalate ; Solid-state ion exchange
• 刊名：Powder Technology
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：246
• 期：Complete
• 页码：643-649
• 全文大小：1314 K

文摘

In this paper, we report the preparation of caesium-exchanged phosphomolybdic acid, Cs₃PMo₁₂O₄₀, via the solid-state reaction between caesium chloride and ammonium phosphomolybdate. The calcination of this mixture was performed at 400 ¡ãC-600 ¡ãC. The thermal genesis of Cs₃PMo₁₂O₄₀ from its precursors was explored using thermo-gravimetric (TGA), differential thermal (DTA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and energy dispersive X-ray analyses. The results obtained indicated that pure ammonium phosphomolybdate hydrate first lost its crystal water and later decomposed at temperatures higher than 450 ¡ãC. In the CsCl and (NH₄)₃PMo₁₂O₄₀ mixture, it was demonstrated that Cs⁺ moves into exchange positions at such temperature without destroying the Keggin structure of the heteropoly compound.