Catalyzed LiBH4 and MgH2 mixture for hydrogen storage

✍ Scribed by Pattaraporn Sridechprasat; Yindee Suttisawat; Pramoch Rangsunvigit; Boonyarach Kitiyanan; Santi Kulprathipanja

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 737 KB
• Volume: 36
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.07.003

✦ Synopsis

The hydrogen desorption/absorption of the 2:1 mole ratio of LiBH 4 and MgH 2 with and without a catalyst was investigated. In the case of the uncatalyzed LiBH 4 /MgH 2 mixture, the first hydrogen desorption started at 50 C. The amount of released hydrogen was 8.6 wt% at the first hydrogen desorption and dramatically reduced to 1.8 wt% at the tenth hydrogen desorption. The decrease in the hydrogen capacity in the subsequent hydrogen desorption may be due to the irreversibility of LiBH 4 . To investigate effects of a catalyst on the hydrogen desorption, 3 mol% of TiCl 3 , HfCl 4 , ZrCl 4 , or VCl 3 was added to the LiBH 4 /MgH 2 mixture. The lowest hydrogen desorption temperature, 260 C, was from the sample with TiCl 3 . An amount of the catalyst also influenced the kinetics of the hydride mixture and 5 mol% seems to be an optimum amount of TiCl 3 that resulted in the lowest hydrogen desorption temperature, 240 C. In addition, the higher the amount of a catalyst, the lower the amount of the released hydrogen.