Vol 7, No 8 (2016) > Chemical Engineering >

Desorption Temperature Characteristic of Mg-based Hydrides Catalyzed by Nano-SiO2 Prepared by High Energy Ball Milling

Zulkarnain Jalil, Adi Rahwanto, Farid Mulana, Mustanir Mustanir

 

Abstract: Magnesium-based hydrogen
storage alloy is one of the most attractive hydrogen storage materials for fuel
cell-powered vehicle application. However, a high desorption temperature and
slow kinetics limit its practical application. Extensive efforts are required
to overcome these problems, one of which is inserting a metal oxide catalyst.
In this work, we reported the current progress of using nano-silica (SiO2)
as a catalyst to improve the thermodynamics and kinetics of magnesium hydride
(MgH2). Nano-SiO2 was extracted from local rice husk ash
(RHA) using the co-precipitation method. Then, the MgH2 was
catalyzed with a small amount of nano-SiO2 (1 wt%, 3 wt%, and 5 wt%)
and prepared using a high-energy milling technique. The microstructure and
hydrogen desorption performance were studied using x-ray diffraction (XRD),
scanning electron microscopy (SEM), and differential scanning calorimetry
(DSC). The results of the XRD test showed that the milling process over 5 h
reduced the material to a nanometer scale. Then, SEM images showed that the
powders were agglomerated after 5 h of milling. Furthermore, it was also found
that nano-SiO2 reduced the hydrogen desorption temperature of MgH2
to 338°C in 14.75 min when the 5 wt% variation of the catalyst was applied.
Keywords: Catalyst; Hydrogen storage; Magnesium hydride; Milling; Rice husk ash; Silica

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