Synthesis and characterization of Fe-modified zeolite for spin conversion of hydrogen at cryogenic temperature

Title
Synthesis and characterization of Fe-modified zeolite for spin conversion of hydrogen at cryogenic temperature
Authors
김정현강상우나인욱오인환
Keywords
Fe-modified zeolite; ortho-hydrogen; para-hydrogen; magnetic properties; pressure drop
Issue Date
2015-12
Publisher
International journal of hydrogen energy
Citation
VOL 40, 15529-15533
Abstract
Fe-modified zeolite was prepared by ion-exchange of zeolite with ferric chloride and calcination, for effective spin conversion of ortho- to-para-hydrogen. Studies carried out using BET, SEM, EDS, and VSM techniques. Results indicated that spin conversion rate showed great dependence on magnetic properties of the composite according to calcination temperature change. For lower sintering temperatures, the samples showed more paramagnetic behavior. As sintering temperature increased, ferromagnetic state increase, while paramagnetic states decreased. The highest spin conversion was observed at paramagnetic state, comparing with ferromagnetic, at lower calcination temperature. Moreover, Fe-modified zeolite showed a superior hydrodynamic property such as the pressure drop ratio of composite to a commercial iron oxide. These composites can be applied in more efficient hydrogen liquefaction processes.
URI
http://pubs.kist.re.kr/handle/201004/50709
ISSN
03603199
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KIST Publication > Article
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