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Effects of Ti-based catalysts on hydrogen desorption kinetics of nanostructured magnesium hydride

Daryani, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2014.10.078
  3. Abstract:
  4. In the present work, the synergetic effect of Ti-based catalysts (TiH2 and TiO2 particles) on hydrogen desorption kinetics of nanostructured magnesium hydride was investigated. Nanostructured 84mol% MgH2-10%mol TiH2-6%mol TiO2 nanocomposite powder was prepared by high-energy ball milling and subjected to thermal analyses. Evaluation of the absorption/desorption properties revealed that the addition of the Ti-based catalysts significantly improved the hydrogen storage performance of MgH2. A decrease in the decomposition temperature (as high as 100°C) was attained after co-milling of MgH2 with the Ti-based catalysts. Meanwhile, solid-state chemical reactions between MgH2 and TiO2 nanoparticles during co-milling slightly decreased the maximum hydrogen capacity. It was also found that formation of micro-cracks at the particle surfaces during thermal cycling enhanced the H-kinetics. Isothermal and non-isothermal thermal analysis revealed that the addition of Ti-catalysts reduced the decomposition activation energy of MgH2 by 20-30kJ/mol
  5. Keywords:
  6. Cyclic desorption ; Nanostructure ; TiO2 ; Activation analysis ; Activation energy ; Ball milling ; Catalysts ; Desorption ; Enzyme kinetics ; Hydrides ; Hydrogen ; Isotherms ; Kinetics ; Magnesium ; Magnesium printing plates ; Milling (machining) ; Nanocomposites ; Nanostructures ; Solid state reactions ; Thermoanalysis ; Titanium dioxide ; Absorption/desorption properties ; Decomposition activation energy ; Decomposition temperature ; Magnesium hydride ; Nanostructured magnesium ; Solid-state chemical reactions ; TiH2 ; TiO ; Hydrogen storage
  7. Source: International Journal of Hydrogen Energy ; Volume 39, Issue 36 , December , 2014 , Pages 21007–21014 ; ISSN: 03603199
  8. URL: http://www.sciencedirect.com/science/article/pii/S0360319914029188