Journal
CRYOGENICS
Volume 69, Issue -, Pages 36-43Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cryogenics.2015.03.003
Keywords
Ortho-para hydrogen spin conversion; FeAl; FeTi; FeCe catalysts; Cryogenic temperature; In situ FUR; Raman; SEM; XRD
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Funding
- Convergence Research Center Program - Ministry of Future Creation and Science, South Korea [2013000402]
- Hannam University
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Alumina-supported iron oxides have been prepared by incipient wetness impregnation method and employed for orthohydrogen to parahydrogen spin conversion at cryogenic temperature. These materials were characterized using a series of characterization techniques such as SEM, XRD, Raman and in situ FTIR spectroscopy. The spin conversion was investigated at low temperature by a batch mode of operation. The in situ FTIR spectra were collected in a transmission mode to obtain the spin conversion. While the iron oxide was highly dispersed over alumina support at low loading percent, a rodlike crystallite of iron oxide was formed at high loading percent. The 10 and 20 wt% iron oxides on alumina were proved to be the most active catalysts. The spin conversion process was very slow and time-dependent. It was concluded that the spin conversion was a function of various factors including the iron oxide loading percent, calcination temperature, and different supports. (C) 2015 Elsevier Ltd. All rights reserved.
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