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Paper
Phys. Chem. Chem. Phys., 2006, 8, 2889 - 2892, DOI: 10.1039/b603268k
Dependence of dissociation pressure upon doping level of Ti-doped sodium alanate—a possibility for
thermodynamic tailoring
of the systemGuido Streukens, Borislav Bogdanovi
, Michael Felderhoff and Ferdi Schüth
Pressure–concentration isotherms have been recorded for NaAlH4 with different doping levels of titanium. It is well known that titanium accelerates the hydrogenation and dehydrogenation reactions in this system. Our studies have shown that the titanium doping also significantly alters the thermodynamics of the system, which is demonstrated by the change of the dissociation pressure with doping level. This can be explained by changes in the systems energy by dilution of the TiAl-alloy present after doping: Such an alloy forms as a result of the doping reaction. Aluminum generated during the dehydrogenation reaction dilutes this alloy, which gives an additional contribution to the free energy of the system.
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