Spin conversion of hydrogen using supported iron catalysts at cryogenic temperature
- Spin conversion of hydrogen using supported iron catalysts at cryogenic temperature
- Taraknath Das; 권순철; 나인욱; 강상우; 최정길; 오인환
- Ortho-para hydrogen spin conversion; FeAl; FeTi; FeCe catalysts; Cyrogenic temperature; In Situ FTIR; Raman; SEM; XRD
- Issue Date
- VOL 69, 36-43
- 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.
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