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Tin and tin-titanium as catalyst components for reversible hydrogen storage of sodium aluminium hydride

Fu, Q.J. and Tsang, S.C. (2006) Tin and tin-titanium as catalyst components for reversible hydrogen storage of sodium aluminium hydride. Fuel, 85 (14-15). pp. 2141-2147. ISSN 0016-2361

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To link to this item DOI: 10.1016/j.fuel.2006.03.017

Abstract/Summary

This paper is concerned with the effects of adding tin and/or titanium dopant to sodium aluminium hydride for both dehydrogenation and re-hydrogenation reactions during their reversible storage of molecular hydrogen. Temperature programmed decomposition (TPD) measurements show that the dehydrogenation kinetics of NaAlH4 are significantly enhanced upon doping the material with 2 mol% of tributyltin hydride, Sn(Bu)(3)H but the tin catalyst dopant is shown to be inferior than titanium. On the other hand, in this preliminary work, a significant synergetic catalytic effect is clearly revealed in material co-doped with both titanium and tin catalysts which shows the highest reversible rates of dehydrogenation and re-hydrogenation (after their hydrogen depletion). The re-hydrogenation rates of depleted Sn/Ti/NaAlH4 evaluated at both 9.5 and 140 bars hydrogen are also found to be favourable compared to the Ti/NaAlH4, which clearly suggest the importance of the catalyst choice. Basing on these results some mechanistic insights for the catalytic reversible dehydrogenation and re-hydrogenation processes of Sn/Ti/NaAlH4 are therefore made. (C) 2006 Elsevier Ltd. All rights reserved.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:11256
Uncontrolled Keywords:hydrogen storage materials, titanium, catalyst, COMPLEX METAL-HYDRIDES, ALANATES, BEHAVIOR, LIALH4, NAALH4

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