title: Dependence of dissociation pressure upon doping level of Ti-doped sodium alanate--a possibility for "thermodynamic tailoring" of the system.
abstract: Pressure-concentration isotherms have been recorded for NaAlH(4) 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.
authors.affiliation: Max Planck Institut für Kohlenforschung, 45470 Mülheim a. d. Ruhr, Germany.
authors.forename: Guido
authors.initials: G
authors.lastname: Streukens
authors.forename: Borislav
authors.initials: B
authors.lastname: Bogdanović
authors.forename: Michael
authors.initials: M
authors.lastname: Felderhoff
authors.forename: Ferdi
authors.initials: F
authors.lastname: Schüth
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D011312:Pressure; D017670:Sodium Compounds / Q000737:chemistry*; D013816:Thermodynamics; D014025:Titanium / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D017670:Sodium Compounds; C513667:sodium aluminum hydride; D014025:Titanium