Tin and tin–titanium as catalyst components for reversible hydrogen storage of sodium aluminium hydride |
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| Affiliation: | 1. State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, PR China;2. School of the Environment, Nanjing University, Nanjing 210023, PR China;3. Center of Materials Analysis, Nanjing University, Nanjing 210093, PR China;4. Jiangsu Engineering Center for Biomass Energy and Low Carbon Technology, Nanjing 210023, PR China;1. International Innovation Center, University of Nottingham, Ningbo, China;2. School of Mechanical Engineering, University of Birmingham, Birmingham, UK;3. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, UK;1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, P.O. Box 272, Shanghai 200237, PR China;2. Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, P.O. Box 272, Shanghai 200237, PR China;3. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, PR China |
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| Abstract: | 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)3H 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. |
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