In order to prepare high performance catalyst for orthohydrogen-parahydrogen conversion,Fe-based active species are prepared in-situ in the pores of SiO2 material.The properties of the catalyst are regulated by means of physical confinement of SiO2 to Fe-based species,so as to improve the performance of the catalyst.The influences of physical confinement on catalyst properties are studied by means of various characterization methods,and the relationship between physical confinement and catalyst properties is analyzed.The results show that the physical confinement can be utilized to effectively regulate the properties of catalyst and improve the performance of catalyst.The catalyst that is prepared with a silicon source to template agent mole ratio of 20∶1 can deliver an orthohydrogen conversion rate of 47.2%under liquid-nitrogen temperature and a volume space velocity of 600 min-1.The content of parahydrogen at the outlet of the device reaches 47%.
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