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International Journal of Hydrogen Energy, November 2014

Spin conversion of hydrogen over LaFeO3/Al2O3catalysts at low temperature: Synthesis, characterization and activity

Intitulé de l'article

Spin conversion of hydrogen over LaFeO3/Al2O3catalysts at low temperature: Synthesis, characterization and activity

Revue International Journal of Hydrogen Energy
Date de publication

29 November 2014

Auteurs

Taraknath Das

Soon-Cheol Kweon

Jeong-Gil Choi

Seo Young Kim

In-Hwan Oh

Abstract

A series of LaFeO3perovskite catalysts over alumina support (LaFeO3/Al2O3) were prepared by citrate sol–gel method by changing the loading of LaFeO3on alumina. The morphology and structure of perovskite catalysts were characterized by SEM, XRD, Raman spectroscopy, and the spin conversion of ortho hydrogen to para hydrogen was investigated byin situFTIR spectroscopy at 17 K temperature. The spin conversion was primarily affected by the dispersion of perovskite phase over the support, the weight percent of LaFeO3loading on alumina, and the ratio of lanthanum to iron in LaFeO3. The perovskite phase was formed at 1173 K, and less sintered and more dispersed at lower calcination temperatures. Thus, the highest spin conversion was observed for the perovskite catalyst calcined at 773 K with 20LaFeO3/Al2O3and the 2:8 ratio of La to Fe (20La0.2Fe0.8O3/Al2O3), where 99.8% of ortho hydrogen at 17 K was converted into para hydrogen in 120 min interaction with the perovskite catalyst.
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