AlH3的制备及放氢特性  

Preparations and Dehydriding Properties of AlH_3

作　　者：刘海镇[1,2] 王新华[1,2] 刘永安 严密[3] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027 [2]浙江大学浙江省电池新材料与应用技术重点实验室,杭州310027 [3]浙江大学硅材料国家重点实验室,杭州310027

出　　处：《高等学校化学学报》2013年第10期2274-2278,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51171168);浙江省自然科学基金(批准号:Y4110147);浙江省公益性技术研究项目(批准号:2013C31033);浙江省电池新材料与应用技术重点创新团队(批准号:2010R50013)资助

摘　　要：以LiAlH4,LiBH4和AlCl3为原料,采用有机合成法制备了单一相的α-AlH3和γ-AlH3,并对其放氢性能进行了研究.结果表明,两种晶型AlH3的放氢量均可达8.3%～8.5%(质量分数),放氢温度范围在120～160℃之间,且γ-AlH3的放氢峰值温度比α-AlH3低8.2℃;α-AlH3和γ-AlH3的放氢反应表观活化能分别为94.6和86.3 kJ/mol;加热过程中α-AlH3直接发生放氢反应,γ-AlH3在放氢前先发生向α-AlH3的相变,这一相变过程使得AlH3的晶格得到活化,从而促进放氢反应的进行.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.

关 键 词：储氢材料 储氢性能 金属氢化物 氢化铝 

分 类 号：O611.61[理学—无机化学]