α-AlH_3的合成及热分解动力学  

Synthesis and thermal decomposition kinetics of α-AlH_3

作　　者：秦明娜[1] 张彦[1] 汪伟[1] 唐望[1] 石强[1] 邱少君[1] 

机构地区：[1]西安近代化学研究所,西安710065

出　　处：《固体火箭技术》2014年第2期219-222,共4页Journal of Solid Rocket Technology

摘　　要：以LiAlH4和AlC13为原料制备α-AlH3,采用XRD、SEM对其结构和形貌进行表征。采用TG/DTG-DSC联用技术研究其热分解过程,通过计算获得了热分解动力学参数。结果表明,α-AlH3热分解反应遵循随机成核与核增长模型,其反应活化能、指前因子、机理函数分别为Ea=110.89 kJ/mol,lnA=26.94 s-1,f(α)=-ln(1-α)1/4,其热分解反应动力学方程为dα/dT=(2.004×1011/β)exp(-1.333 78×104/T)(1-α)[-ln(1-α)]3/4。Abstract ：α-AlH3 was synthesized by using LiAlH4 and Al C l3 as raw materials. The products were characterized by XRD and SEM.The thermal decomposition reaction of α-AlH3 was investigated by TG/DTG-DSC. The kinetic parameters of the major decom- position reaction were calculated.The decomposition reaction of α-AlH3 conformed to nuclei production and nuclei growth model.The apparent activation energy, pre-exponential factor and mechanism function of the decomposition reaction of α-AlH3 are Ea = 110.89 kJ/mol, lnA = 26.94 s-1, f（α） = -In（1-α） 1/4, respectively.The kinetic equation of the decomposition process can be expressed as dα/dT=（2.004×10^11/β）exp（-1.33378×10^4/r）（1-α）[-ln（1-α）]3/4.

关 键 词：Α-ALH3 TG DTG—DSC 热分解 机理 动力学 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]