Environmental Engineering Reference
In-Depth Information
density. The advantages of metal hydrides include low pressure hydrogen
adsorption and storage, as well as less rigorous requirement for containers.
However, the thermodynamics and kinetics of metal hydrides present the
greatest challenges since the formation of metal hydride and dehydrogena-
tion process involve the formation or breaking of metal-hydrogen bonds. In
most cases, high temperatures around 120-300°C are required to release the
hydrogen, and the hydrogen adsorption and desorption rates are very slow.
Sometimes, metal hydrides with high hydrogen content cannot adsorb and
desorb hydrogen reversibly. Therefore, searching for new lightweight metal
hydrides and tuning their thermodynamic and kinetic properties are the main
research directions in this field.
As on the possibility of using hydrocarbons as a means for hydrogen
storage, it is clear that while the potential exists, it is uncertain how effective
this can be on a large scale. Further research is needed to better understand
the reaction mechanisms as well as engineering issues for practical applica-
tions. This approach still involves CO 2 , which is an environmental concern,
but is attractive since hydrocarbons can be handled easily using existing
1. Züttel, A., Remhof, A., Borgschulte, A., Friedrichs, O. Hydrogen: The future energy
carrier. Philosophical Transactions of the Royal Society A 2010 , 368 , 3329-3342.
2. Schlapbach, L., Anderson, I., Burger, J.P. Hydrogen in metals. In K.H.J Buschow, ed.,
Electronic and Magnetic Properties of Metals and Ceramics Part II , VCH, Weinheim,
1994, Vol. 3B, p .271.
3. Zuttel, A. Materials for hydrogen srorage. Materials Today 2003 , 6 , 24-33.
4. Schlapbach, L., Zuttel, A. Hydrogen-storage materials for mobile applications. Nature
2001 , 414 (6861), 353-358.
5. Mintz, M.H., Zeiri, Y. Hydriding kinetics of powders. Journal of Alloys and Compounds
1994 , 216 (2), 159-175.
6. Avrami, M. Kinetics of phase change. I. General theory. Journal of Chemical Physics
1939 , 7 , 1103-1112.
7. http://www1.eere.energy.gov/hydrogenandfuelcells/storage/pdfs/targets_onboard
_hydro_storage_explanation.pdf (last accessed December 19, 2013).
8. Broom, D.P. Hydrogen Storage Materials: The Characterisation of Their Storage Proper-
ties , Springer, London, 2011.
9. Hirscher, M. Handbook of Hydrogen Storage: New Materials for Future Energy Storage ,
WILEY-VCH, Weinheim, 2010.
10. Züttel, A., Borgschulte, A., Schlapbach, L. Hydrogen as a Future Energy Carrier , Wiley-
VCH, Weinheim, 2008.
Search WWH ::

Custom Search