Hydrogen Desorption/Absorption Kinetics of MgH₂ Catalyzed with TiO₂

Abstract:

We report on the preparation and hydrogen desorption/absorption kinetics of nanocrystalline magnesium hydride (MgH₂) added commercial TiO₂ by high-energy ball milling. The phase and composition of the as-milled powders are characterized by X-ray diffraction (XRD). The results show that the milled sample contained MgH₂ phase, small amount of Mg and various phases of TiO₂ such as tetragonal and orthorhombic structure. The effect of the milling time (10, 20 and 30 h) on the hydrogen desorption property of MgH₂ has been investigated and found that the milling time of 20 h has excellent dehydrogenation properties, which can release 3.3 wt% H₂ within 60 min at 300 ^oC, which indicates that the kinetics of hydrogen desorption of MgH₂-TiO₂ composite has been greatly enhanced compared to the pure MgH₂. Moreover, hydrogen absorption kinetics of the sample milled 20 h has been studied and the hydrogen content is 0.7, 0.8 and 1.2 wt% H₂ at 250, 280 and 300 ^oC within 60 min, respectively.

• Periodical: Advanced Materials Research (Volumes 986-987)
• Pages: 88-91
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.986-987.88
• Online since: July 2014
• Authors: Yan Wang*, Shi Wei Wu, Hao Yu, Na Na Gong, Zhong Qiu Cao, Ke Zhang
• Keywords: Hydrogen Storage, Kinetic, Magnesium Hydride, Mechanical Milling

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