Reversible hydrogen storage in Ti–Zr-codoped NaAlH4 under realistic operation conditions: Part 2
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In: Journal of Alloys and Compounds, Vol. 509, No. SUPPL. 2, 09.2011, p. S740-S742.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Reversible hydrogen storage in Ti–Zr-codoped NaAlH4 under realistic operation conditions: Part 2
AU - Schmidt, Thomas
AU - Röntzsch, Lars
AU - Weißgärber, Thomas
AU - Kieback, Bernd
N1 - Proceedings of the 12th International Symposium on Metal-Hydrogen Systems, Fundamentals and Applications (MH2010)
PY - 2011/9
Y1 - 2011/9
N2 - Recently, we have demonstrated that the dehydrogenation of NaAlH4 can be carried out with sufficient kinetics even at a hydrogen back pressure of 4 bar, which is needed for a proton exchange membrane (PEM) fuel cell [10]. In this contribution the influence of hydrogen back pressure in the range of 0.2 up to 5 bar and catalyst concentration in the range between 1 and 5 wt.% overall catalyst concentration on the dehydrogenation of Zr–Ti codoped NaAlH4 is investigated in detail. The influence of the hydrogen back-pressure is significant in the 2nd dehydrogenation step. The catalyst concentration influences both kinetics and storage capacity. Rate constants as a function of the temperature and hydrogen back-pressure and activation energies of the dehydrogenation of NaAlH4 to Na3AlH6 at 1 bar and 4 bar hydrogen pressure are calculated from isothermal dehydrogenation experiments.
AB - Recently, we have demonstrated that the dehydrogenation of NaAlH4 can be carried out with sufficient kinetics even at a hydrogen back pressure of 4 bar, which is needed for a proton exchange membrane (PEM) fuel cell [10]. In this contribution the influence of hydrogen back pressure in the range of 0.2 up to 5 bar and catalyst concentration in the range between 1 and 5 wt.% overall catalyst concentration on the dehydrogenation of Zr–Ti codoped NaAlH4 is investigated in detail. The influence of the hydrogen back-pressure is significant in the 2nd dehydrogenation step. The catalyst concentration influences both kinetics and storage capacity. Rate constants as a function of the temperature and hydrogen back-pressure and activation energies of the dehydrogenation of NaAlH4 to Na3AlH6 at 1 bar and 4 bar hydrogen pressure are calculated from isothermal dehydrogenation experiments.
KW - Chemistry
KW - Alanate
KW - Sodium aluminum hydride
KW - Codoping
KW - Ti
KW - Zr
KW - Realistic operation conditions
KW - Activation energy
KW - Energy research
KW - Hydrogen storage
KW - PEM fuel cell
KW - Back pressure
KW - Rate constants
KW - Sustainability Science
UR - http://www.scopus.com/inward/record.url?scp=80052818840&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2010.10.183
DO - 10.1016/j.jallcom.2010.10.183
M3 - Journal articles
VL - 509
SP - S740-S742
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - SUPPL. 2
ER -