Spin conversion of hydrogen over LaFeO 3 /Al 2 O 3 catalysts at low temperature: Synthesis, characterization and activity
| Autor: | Soon-cheol Kweon, Taraknath Das, Seo Young Kim, In-Hwan Oh, Jeong-Gil Choi |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Spin isomers of hydrogen law.invention Catalysis symbols.namesake Fuel Technology chemistry law symbols Lanthanum Calcination Fourier transform infrared spectroscopy Raman spectroscopy Perovskite (structure) |
| Zdroj: | International Journal of Hydrogen Energy. 40:383-391 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2014.10.137 |
| Popis: | A series of LaFeO3 perovskite catalysts over alumina support (LaFeO3/Al2O3) were prepared by citrate sol–gel method by changing the loading of LaFeO3 on 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 by in situ FTIR spectroscopy at 17 K temperature. The spin conversion was primarily affected by the dispersion of perovskite phase over the support, the weight percent of LaFeO3 loading 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/Al2O3 and 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. |
| Databáze: | OpenAIRE |
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