Empirical kinetic model of sodium alanate reacting system (II). Hydrogen desorption

Abstract Hydrogen storage systems based on metal hydrides require appropriate quantitative kinetic description for simulations and designs, in particular for the crucial absorption process. This investigation proposes an empirical kinetic model for the hydrogen absorption of sodium alanate material doped with aluminium-reduced TiCl4, produced in kg-scale. The model is based on kinetic data obtained by volumetric titration measurements performed on each of the two absorption steps of sodium alanate, within a range of experimental conditions varying from 10 bar to 110 bar and from 100 °C to 180 °C. It is shown that each step is best described by the JMA model with n = 1.33. The kinetic equations are implemented in a mass balance and used to predict the reaction rate of the two steps of hydrogen absorption. Even when they proceed simultaneously, the predictions agree well with experimental results. The second paper of this investigation presents the results for the kinetic model of the corresponding hydrogen desorption.

[1]  F. Askri,et al.  Numerical simulation of heat and mass transfer in metal hydride hydrogen storage tanks for fuel cell vehicles , 2010 .

[2]  M. Fichtner,et al.  Hydrogen exchange kinetics in NaAlH4 catalyzed in different decomposition states , 2004 .

[3]  M. Kanouff,et al.  Thermal properties characterization of sodium alanates , 2005 .

[4]  F. Askri,et al.  Hydrogen storage in metal hydride tanks equipped with metal foam heat exchanger , 2009 .

[5]  S. Srinivasan,et al.  Kinetic study and determination of the enthalpies of activation of the dehydrogenation of titanium- and zirconium-doped NaAlH4 and Na3AlH6 , 2003 .

[6]  K. Gross,et al.  A kinetics model of hydrogen absorption and desorption in Ti-doped NaAlH4 , 2004 .

[7]  G. Sandrock,et al.  Effect of Ti-catalyst content on the reversible hydrogen storage properties of the sodium alanates , 2002 .

[8]  F. T..  Stainless Steels , 2015, Nature.

[9]  P. Rudman,et al.  Hydriding and dehydriding kinetics , 1983 .

[10]  A. Freni,et al.  Finite element-based simulation of a metal hydride-based hydrogen storage tank , 2009 .

[11]  M. Dornheim,et al.  Tailoring Hydrogen Storage Materials Towards Application , 2006 .

[12]  M. Dornheim,et al.  Industrial production of light metal hydrides for hydrogen storage , 2007 .

[13]  Thomas Klassen,et al.  Kinetic investigation of the effect of milling time on the hydrogen sorption reaction of magnesium catalyzed with different Nb2O5 contents , 2006 .

[14]  Georg Fieg,et al.  Concept, Design and Manufacture of a Prototype Hydrogen Storage Tank Based on Sodium Alanate , 2009 .

[15]  B. Bogdanovic,et al.  Ti-doped alkali metal aluminium hydrides as potential novel reversible hydrogen storage materials , 1997 .

[16]  Dragan D. Nikolic,et al.  Modeling and optimization of multi-tubular metal hydride beds for efficient hydrogen storage , 2009 .

[17]  Ferdi Schüth,et al.  One-step direct synthesis of a Ti-doped sodium alanate hydrogen storage material. , 2005, Chemical communications.

[18]  M. Fichtner,et al.  Kinetic studies of the decomposition of NaAlH4 doped with a Ti-based catalyst , 2005 .

[19]  R. Brand,et al.  Metal-doped sodium aluminium hydrides as potential new hydrogen storage materials , 2000 .

[20]  G. Lozano,et al.  Effects of heat transfer on the sorption kinetics of complex hydride reacting systems , 2009 .