Das, Taraknath Kweon, Soon-Cheol Nah, In Wook Karng, Sarng Woo Choi, Jeong-Gil Oh, In-Hwan 2024-01-20T06:34:09Z 2024-01-20T06:34:09Z 2021-09-05 2015-07 0011-2275 https://pubs.kist.re.kr/handle/201004/125274 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. English ELSEVIER SCI LTD PARAHYDROGEN-INDUCED POLARIZATION MATRIX-ISOLATION SPECTROSCOPY PARA H-2 CONVERSION LIQUID-HYDROGEN VIBRATIONAL SPECTROSCOPY MOLECULAR-HYDROGEN OXIDE CATALYSTS SOLID HYDROGEN DRIFT SPECTRA ZINC OXIDE Spin conversion of hydrogen using supported iron catalysts at cryogenic temperature Article 10.1016/j.cryogenics.2015.03.003 1 CRYOGENICS, v.69, pp.36 - 43 CRYOGENICS 69 36 43 scie scopus 000356986400005 2-s2.0-84927945443 Thermodynamics Physics, Applied Thermodynamics Physics Article PARAHYDROGEN-INDUCED POLARIZATION MATRIX-ISOLATION SPECTROSCOPY PARA H-2 CONVERSION LIQUID-HYDROGEN VIBRATIONAL SPECTROSCOPY MOLECULAR-HYDROGEN OXIDE CATALYSTS SOLID HYDROGEN DRIFT SPECTRA ZINC OXIDE Ortho-para hydrogen spin conversion FeAl FeTi FeCe catalysts Cryogenic temperature In situ FUR Raman SEM XRD