Das, Taraknath Nah, In Wook Choi, Jeong-Gil Oh, In-Hwan 2024-01-20T03:34:09Z 2024-01-20T03:34:09Z 2021-09-05 2016-08 1878-5190 https://pubs.kist.re.kr/handle/201004/123823 A series of alpha-Fe2O3 catalysts were synthesized using various methods such as incipient wetness impregnation, soft templating, hard templating, precipitation and citrate sol-gel. The surface morphology and crystallite sizes were characterized by SEM, XRD and Raman spectroscopy. The spin conversion of ortho hydrogen to para hydrogen was studied using in situ FTIR spectroscopy at cryogenic temperature (17 K). The spin conversion was very slow and time dependent. The spin conversion was also strongly dependent on the crystallite size of alpha-Fe2O3 and the methods of synthesis. The catalyst synthesized by precipitation method possessed the highest spin conversion similar to 99.9 % after 45 min of interaction. The catalyst synthesized by templating methods showed average activity. The catalyst synthesized by the citrate sol-gel method showed very poor activity due to formation of larger crystallite sizes. English SPRINGER PASADENA HYPERPOLARIZATION HYDROTHERMAL SYNTHESIS MESOPOROUS MATERIALS ALPHA-FE2O3 NANOPARTICLES FE2O3 PERFORMANCE CONVERTER NANOSTRUCTURES SPECTROSCOPY Synthesis of iron oxide catalysts using various methods for the spin conversion of hydrogen Article 10.1007/s11144-016-1035-4 1 REACTION KINETICS MECHANISMS AND CATALYSIS, v.118, no.2, pp.669 - 681 REACTION KINETICS MECHANISMS AND CATALYSIS 118 2 669 681 scie scopus 000379345000023 2-s2.0-85028247127 Chemistry, Physical Chemistry Article PASADENA HYPERPOLARIZATION HYDROTHERMAL SYNTHESIS MESOPOROUS MATERIALS ALPHA-FE2O3 NANOPARTICLES FE2O3 PERFORMANCE CONVERTER NANOSTRUCTURES SPECTROSCOPY Ferric oxide catalyst Precipitation method Templating method Raman spectroscopy In situ FTIR Ortho-para hydrogen spin conversion