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An investigation on the Hydrogenation Properties of 4MgH2 + Na3AlH6
composite catalyzed with FeCl3 for Hydrogen Storage Materials.
Chew Zhia Yee
Supervisor: Dr. Mohammad Bin Ismail
Bachelor of Applied Science (Electronics and Instrumentation Physics)
School of Ocean Engineering
In this research, the hydrogen storage properties of 4MgH2 + Na3AlH6 composite
doped with FeCl3 catalyst were investigated. Based on temperature-programmed
desorption results, the first stage of onset desorption temperature of 4MgH2 + Na3AlH6
was reduced from 170 °C to 140 °C after adding FeCl3. Three dehydrogenation steps
with a total of 6.3 wt% of hydrogen released from 4MgH2 + Na3AlH6 with 10 wt%
FeCl3. The re/dehydrogenation kinetics of 4MgH2 + Na3AlH6 composite was also
improved by addition of FeCl3. The Kissinger analysis show the apparent activation
energy was 128 kJ/mol for doped composite, 12 kJ/mol and 30 kJ/mol lower for undoped
composite and as-milled MgH2 respectively. The enhancements of 4MgH2 +
Na3AlH6 hydrogen storage properties with the addition of FeCl3 were due to formation
of the in-situ Fe and MgCl2 species.
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