Abstract
A series of α-Fe2O3 catalysts were prepared by precipitation method by changing calcination temperatures, solvents, precursor concentration, and bases. The structure and morphology of the synthesized catalysts were characterized by SEM, XRD, XPS, and Raman spectroscopy, and the liquid-phase spin conversion of ortho-hydrogen to para-hydrogen was performed by in situ FTIR spectroscopy at cryogenic temperature 17 K. The spin conversion was affected by catalysts calcination temperature, initial precursor concentration, solvents used, and precipitating agent. The highly dispersed and most active α-Fe2O3 was obtained using double-distilled water as solvent and sodium hydroxide solution as precipitating agent followed by calcination at 393 K for 12 h. The formation of hydrated Fe (OH)3 or FeOOH during synthesis of α-Fe2O3 at 393 K dramatically enhanced the catalytic activity and ortho to para-hydrogen spin conversion.
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Schedule a callMore From: Proceedings of the National Academy of Sciences, India Section A: Physical Sciences
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