Dehydrogenation kinetics of as-received and ball-milled LiAlH{sub 4}
- Materials Research Department, Riso National Laboratory, DK-4000 Roskilde (Denmark) and Interdisciplinary Research Center for Catalysis, Department of Chemical Engineering, Technical University of Denmark, DK-2800 Lyngby (Denmark)
- Materials Research Department, Riso National Laboratory, DK-4000 Roskilde (Denmark)
In this paper, we investigate the dehydrogenation kinetics of LiAlH{sub 4} into Li{sub 3}AlH{sub 6} (reaction I) and further into LiH (reaction II). We find the apparent activation energies to be {approx}80 and 100kJ/mol for reactions I and II, respectively. Furthermore, we investigate the effect of ball milling on crystallite size and the dehydrogenation kinetics of both reactions I and II. We find a clear correlation between crystallite size and dehydrogenation kinetics of reaction I. On the other hand, we find the kinetics of reaction II to be independent of the crystallite size. This indicates that reaction I is limited by a mass transfer process, while reaction II is limited by the intrinsic kinetics.
- OSTI ID:
- 20784813
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 12 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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