(1. 中南大學(xué) 化學(xué)化工學(xué)院 有色金屬資源化學(xué)教育部重點實驗室，長沙 410083；
2. 湖南稀土金屬材料研究院，長沙 410014)
摘 要: 以機械球磨法制備具有可逆吸放氫性能的NaAlH4-Tm2O3儲氫材料體系。利用相同制備方法進一步研究兩種不同孔道材料(大孔Al2O3與介孔SiO2)對NaAlH4-Tm2O3 體系儲氫性能的影響，測試樣品的循環(huán)吸放氫性能，并對樣品吸放氫前后的結(jié)構(gòu)進行表征。結(jié)果表明：大孔Al2O3材料的添加并不能明顯改善NaAlH4-Tm2O3體系的放氫速率和放氫量，而介孔SiO2的加入使NaAlH4-Tm2O3體系在150 ℃條件下5 h內(nèi)的首次放氫量(質(zhì)量分?jǐn)?shù))達(dá)到4.61%, 高于NaAlH4-Tm2O3體系的4.27%，增加了約8.0%。此外，添加介孔SiO2的NaAlH4-Tm2O3體系放氫速率也有所提高。
關(guān)鍵字: NaAlH4；Tm2O3；大孔Al2O3；介孔SiO2
（1. Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. Hunan Rare Earth Metal & Material Institute, Changsha 410014, China）
Abstract:NaAlH4-Tm2O3 hydrogen storage system with reversible capacity was prepared by the ball milling method. The mixtures of two different porous materials (macroporous Al2O3 and mesoporous SiO2) and NaAlH4-Tm2O3 were prepared using the same method, and the influence of the two porous materials on NaAlH4-Tm2O3 was investigated. The hydrogen storage capacity and the structure of the samples before and after hydrogen desorption were characterized. The results show that the addition of macroporous Al2O3 can not improve the hydrogen release rate and capacity, but with the addition of mesoporous SiO2, NaAlH4-Tm2O3-SiO2 system has the maximum hydrogen release amount of 4.61% (mass fraction), about 8.0% higher than that of NaAlH4-Tm2O3. Furthermore, the hydrogen desorption rate of NaAlH4-Tm2O3 with mesoporous SiO2 is also improved.
Key words: NaAlH4; Tm2O3; macroporous Al2O3; mesoporous SiO2
