1. MAGNESIUM BASED FOAMS FOR HYDROGEN STORAGE By: J. Omar Gil Posada Supervisor: Professor Peter J. Hall Chemical and Process Engineering Department. University of Strathclyde James Weir Building, 75 Montrose Street, Glasgow G1 1XJ Scotland.

2. Introduction Hydrogen Today hydrogen is used primarily as a chemical precursor to produce different compounds but hydrogen has the potential to be a clean fuel. J. Omar Gil Posada At STP 1g H 2 occupy almost 11L

3. J. Omar Gil Posada

4. Aim The hydrogen adsorption and desorption on magnesium based foams prepared by solid phase were evaluated as a function of the foaming agent (ZrH 2, Cs 2 CO 3 and CaH 2 ) and its composition in the sample. J. Omar Gil Posada

5. Outline Metallic foams. Experimental. Results. Conclusions. References. Questions. J. Omar Gil Posada SANS. HP-DSC. Mass Spectroscopy.

6. Metallic Foams J. Omar Gil Posada Figure 1. Metallic foams

7. Experimental Magnesium powder was mixed at different compositions with several foaming agents, the final sample was tested for hydrogen adsorption and desorption. Mg+F.A. (Cr 2 CO 3, CaH 2 or ZrH 2 ) Mixing Casting Baking Cooling Product Figure 2. Magnesium foam production. J. Omar Gil Posada T2T2 T1T1 t

8. Results Figure 3. Sample appearance before and after heat treatment.

9. Figure 4. SANS intensities from Mg + 0.956% ZrH 2 after H 2 adsorption. J. Omar Gil Posada

10. Figure 5. HP-DSC of Mg + 10.36 % CaH 2 under 30 Bar of Hydrogen in HP-DSC. J. Omar Gil Posada

11. Figure 6. Mass spectra (M= 1, 2 and 18) for Mg + 0.006 %m Cs 2 CO 3 + 0.002%m Ni.. M=1 M=18 M=2

12. Conclusions J. Omar Gil Posada The system Mg + Cs 2 CO 3 shows the best hydrogen sorption properties compared with the other systems. After several runs the magnesium based foams keep their sorption properties, this does not happen with pure magnesium samples. The magnesium samples seem to have occluded porosity. It was found that Ni increases the amount of hydrogen adsorbed.

13. References J. Omar Gil Posada [1] Karl J. Gross, Peter Spatz, Andreas Züttel, Louis Schlapbach. “Mechanically milled Mg composites for hydrogen storage The transition to a steady state composition” Journal of Alloys and Compounds. 240 (1996) 206-213. [2] Hydrogen Storage home page. http://www.csa.com/hottopics/hydrogen/overview.html [3] Gary Sandrock. “A panoramic overview of hydrogen storage alloys from a gas reaction point of view” Journal of Alloys and Compounds. 293-295 (1999) 877-888.

14. Questions J. Omar Gil Posada