Study on dehydrogenation properties of the LiAlH4–NH4Cl system

Abstract In this work, the dehydrogenation properties of the LiAlH4–NH4Cl system and the LiAlH4–NH4Cl doped with CeO2 were analyzed by PCT (pressure–composition–temperature) equipment and SEM (Scanning Electron Microscope) analysis method. The result showed that the LiAlH4–NH4Cl system presented the fastest rate and the earliest starting time of hydrogen release when the molar ratio of LiAlH4 to NH4Cl was 1:1, and the dehydrogenation amount of the sample which the molar ratio of LiAlH4 to NH4Cl is 1:1 was very high and reached to 6.6 wt%. The study on doping with CeO2 showed that doping with CeO2 had further raised the rate and the amount of hydrogen release of the LiAlH4–NH4Cl system and shortened the starting time of hydrogen release. Furthermore, the result showed that doping with CeO2 made the flocculent microstructure of the LiAlH4–NH4Cl system more obvious and looser.