Synthesis and thermal decomposition kinetics of α-AlH_3

α-AlH3was synthesized by using LiAlH4and A1C13as raw materials. The products were characterized by XRD and SEM.The thermal decomposition reaction of α-AlH3was investigated by TG / DTG-DSC. The kinetic parameters of the major decomposition reaction were calculated.The decomposition reaction of α-AlH3conformed to nuclei production and nuclei growth model.The apparent activation energy,pre-exponential factor and mechanism function of the decomposition reaction of α-AlH3are Ea= 110.89 kJ / mol,lnA = 26.94 s-1,f( α) =-ln( 1-α)1 /4,respectively.The kinetic equation of the decomposition process can be expressed as dα / dT =( 2.004×1011/ β) exp(-1.333 78×104/ T)( 1-α) [-ln( 1-α) ]3 /4.