Abstract
Comparative XRD and Mössbauer 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 4 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. Mössbauer spectra of the catalysts show that the phases present in CAT1 are thermally stable up to 500 ∘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 ∘C.
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Proceedings of the 5th Joint International Conference on Hyperfine Interactions and International Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2014), Canberra, Australia, 21–26 September 2014.
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Dasireddy, V.D.B.C., Bharuth-Ram, K., Harilal, A. et al. Fe phase complexes and their thermal stability in iron phosphate catalysts supported on silica. Hyperfine Interact 231, 137–142 (2015). https://doi.org/10.1007/s10751-014-1119-3
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DOI: https://doi.org/10.1007/s10751-014-1119-3