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Kinetics Enhancement, Reaction Pathway Change, and Mechanism Clarification in LiBH4 with Ti-Catalyzed Nanocrystalline MgH2 Composite

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Shao,  Huaiyu
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Felderhoff,  Michael
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Weidenthaler,  Claudia
Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Shao, H., Felderhoff, M., & Weidenthaler, C. (2015). Kinetics Enhancement, Reaction Pathway Change, and Mechanism Clarification in LiBH4 with Ti-Catalyzed Nanocrystalline MgH2 Composite. The Journal of Physical Chemistry C, 119(5), 2341-2348. doi:10.1021/jp511479d.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-CBB7-E
Abstract
A composite of 2 LiBH4 + nano-MgH2* (Ti-catalyzed) shows significantly enhanced desorption kinetics compared to a conventional mixture of 2 LiBH4 + MgH2. The desorption mechanism was studied in the temperature range between 304 and 383 °C and under different pressure conditions. Desorption temperatures are 50–70 °C lower compared to conventional 2 LiBH4 + MgH2 mixtures. During the hydrogen release from a mixture of 2 LiBH4 + MgH2* at a hydrogen back-pressure of 0.4 MPa, MgB2 is formed and three different plateaus of equilibrium were detected. The reaction pathway is changed at 360 °C for the 2 LiBH4 + MgH2 system when the nano-MgH2* is used.