Synthesis of iron oxide catalysts using various methods for the spin conversion of hydrogen

Authors
Das, TaraknathNah, In WookChoi, Jeong-GilOh, In-Hwan
Issue Date
2016-08
Publisher
SPRINGER
Citation
REACTION KINETICS MECHANISMS AND CATALYSIS, v.118, no.2, pp.669 - 681
Abstract
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.
Keywords
PASADENA HYPERPOLARIZATION; HYDROTHERMAL SYNTHESIS; MESOPOROUS MATERIALS; ALPHA-FE2O3; NANOPARTICLES; FE2O3; PERFORMANCE; CONVERTER; NANOSTRUCTURES; SPECTROSCOPY; 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
ISSN
1878-5190
URI
https://pubs.kist.re.kr/handle/201004/123823
DOI
10.1007/s11144-016-1035-4
Appears in Collections:
KIST Article > 2016
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