Spin conversion of hydrogen using supported iron catalysts at cryogenic temperature

In situ FTIR system for the spin conversion of liquid phase orthohydrogen to parahydrogen. [Display omitted] •In situ FTIR spectroscopy for spin conversion of hydrogen.•Ortho to para hydrogen spin conversion at cryogenic temperature.•Supported iron oxide catalysts are active at low temperature.•The...

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Bibliographic Details
Published in:Cryogenics (Guildford) 2015-07, Vol.69, p.36-43
Main Authors: Das, Taraknath, Kweon, Soon-Cheol, Nah, In Wook, Karng, Sarng Woo, Choi, Jeong-Gil, Oh, In-Hwan
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysis
Catalysts
Conversion
Cryogenic temperature
Crystallites
FeAl
FeCe catalysts
FeTi
In situ FTIR
Iron oxides
Ortho–para hydrogen spin conversion
Raman
SEM
Wetness
XRD
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Summary:In situ FTIR system for the spin conversion of liquid phase orthohydrogen to parahydrogen. [Display omitted] •In situ FTIR spectroscopy for spin conversion of hydrogen.•Ortho to para hydrogen spin conversion at cryogenic temperature.•Supported iron oxide catalysts are active at low temperature.•The most active catalyst was 10–20wt% iron oxide supported on alumina. 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 20wt% 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.
ISSN:0011-2275
1879-2235
DOI:10.1016/j.cryogenics.2015.03.003