中文摘要：

以LiAlH4，LiBH。和AlCl3为原料，采用有机合成法制备了单一相的α—AlH，和γ-AlH，并对其放氢性能进行了研究．结果表明，两种晶型A1H，的放氢量均可达8．3％～8．5％（质量分数），放氢温度范围在120～160oC之间，且γ-AlH，的放氢峰值温度比α—AlH3低8．2℃；α—AlH，和γ-AlH，的放氢反应表观活化能分别为94．6和86．3kJ／mol；加热过程中α—A1H，直接发生放氢反应，7-AIH，在放氢前先发生向a-A1H，的相变，这一相变过程使得A1H，的晶格得到活化，从而促进放氢反应的进行．

英文摘要：

A1H3 is a promising hydrogen storage material due to its high hydrogen capacity（ 10%, mass frac tion） and relatively low dehydriding temperature （ 100--200 ℃ ）. However, the complicate synthesis proce dure restricts the fundamental investigation and practical application of A1H3. In this paper, with LiA1H4, LiBH4 and A1C13 as the raw materials, pure ct-A1H3 and T-A1H3 were prepared and their dehydriding properties were studied. The experimental results show that the hydrogen desorption capacity of the prepared A1H3 rea- ches 8.3%--8.5% （mass fraction）, and the dehydriding temperature ranges from 120 ℃ to 160 ℃ The peak dehydriding temperature of T-A1H3 is 8.2 ℃lower than that of ct-A1H3. The activation energies of de- hydriding reaction of a-A1H3 and T-A1H3 are 94.6 kJ/mol and 86.3 kJ/mol, respectively. During heating pro- cedure, a-A1H3 directly decomposes and releases hydrogen, while T-A1H3 transforms to a-A1H3 before decom- position.