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Role of Ti-based catalysts in the dehydrogenation mechanism of magnesium borohydride: A cluster approach

Authors
Journal
International Journal of Hydrogen Energy
0360-3199
Publisher
Elsevier
Volume
38
Issue
5
Identifiers
DOI: 10.1016/j.ijhydene.2012.11.060
Keywords
  • Hydrogen Storage
  • Catalysts
  • Clusters
  • Dft
Disciplines
  • Mathematics

Abstract

Abstract The role of Ti and Ti-based catalysts such as TiCl3 and TiF3 in the dehydrogenation of Mg(BH4)2 has been studied using a cluster approach and density functional theory. The optimized geometry of Mg(BH4)2 clusters mimics the structure it has in the crystalline form, but undergoes significant geometric distortion as well as changes in the natural bond orbital (NBO) charge after the addition of the catalysts. While all the catalysts lower the hydrogen desorption energy, elemental Ti appears to be the best catalyst followed by TiCl3 and TiF3. The lowering of the hydrogen desorption is shown to be due to the weakening of the BH bond which is caused by the interaction of Ti with H and Mg.

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