Fe phase complexes and their thermal stability in iron phosphate catalysts supported on silica

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• 作者：Venkata D. B. C. Dasireddy ; K. Bharuth-Ram ; A. Harilal ; S. Singh…
• 关键词：Iron phosphate catalyst ; X ; ray diffraction ; M?ssbauer spectroscopy ; Quartz and trydimite phase
• 刊名：Hyperfine Interactions
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：231
• 期：1-3
• 页码：137-142
• 全文大小：741 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics<br>Nuclear Physics, Heavy Ions and Hadrons<br>Atoms, Molecules, Clusters and Plasmas<br>Condensed Matter<br>Surfaces and Interfaces and Thin Films<br>
• 出版者：Springer Netherlands
• ISSN：1572-9540

文摘

Comparative XRD and M?ssbauer spectroscopy studies have been conducted on the effect of temperature on the phase transformations of an iron phosphate catalyst synthesized using the ammonia gel method (CAT1) and a commercial grade FePO 4b> catalyst supported on silica using wet impregnation method (CAT2). The XRD patterns of both catalysts showed the presence of iron phosphate and the tridymite phase of aluminum phosphate. M?ssbauer spectra of the catalysts show that the phases present in CAT1 are thermally stable up to 500 ?/sup>C, but CAT2 shows significant changes with the tridymite phase of iron phosphate increasing from 6 % to 29 % of the spectral area at a temperature of 500 ?/sup>C.