A Study on the Ortho-para Hydrogen Conversion Characteristics of Liquefied Hydrogen by Perovskite Catalysts
페로브스카이트 촉매에 의한 액화수소의 올소-파라 수소변환특성에 관한 연구

In Wook Nah, Jung Hyun Kim, Taraknath Das, Soon-Cheol Kwon, In-Hwan Oh
2015 Transactions of the Korean hydrogen and new energy society  
>> During the liquefaction of hydrogen, the ortho hydrogen is converted into the para form with heat release that evaporates the liquefied hydrogen into the gaseous one backwards. The ortho-para conversion catalysts are usually used during liquefaction to avoid such boil-off. In order to compare and analyze the performance of the ortho-para hydrogen conversion catalysts, in-situ FT-IR device was designed and manufactured to measure the para hydrogen conversion rate in real-time. LaFeO3 and
more » ... me. LaFeO3 and La0.7Sr0.3Cu0.3Fe0.7O3 perovskite catalysts were prepared by the citrate sol-gel method and their spin conversion characteristics from ortho to para hydrogen were investigated by in-situ FTIR spectroscopy at 17K. It was found that the spin conversion was affected by surface area, particle size, and crystallite size of the catalysts. Thus, the La0.7Sr0.3Cu0.3Fe0.7O3 perovskite catalyst that had higher surface area, higher crystallite size, and smaller particle size than LaFeO 3 showed the better spin conversion property of 32.3% at 17K in 120min interaction with the perovskite catalysts.
doi:10.7316/khnes.2015.26.1.015 fatcat:q7nktjaqzbgjfjeb77y5sby6ke