In the present work, we investigated the hydrogen desorption properties of
nano-sized MgH2 that was loaded on ordered mesoporous carbon (OMC) surface
that had been already modified with nickel and iron oxide nanoparticles. The
surface modified mesoporous carbon was characterized by BET surface area and
X-ray diffraction (XRD) analysis. The amount of MgH2 on the carbon surface
was confirmed by thermogravimetric analysis (TGA). Dehydrogenation data of
MgH2 on the ordered mesoporous carbon were collected for the pressure up to
8 MPa (80 bar) at 500 K. The incorporated MgH2 on nickel oxide-mesoporous
carbon nanocomposite had faster dehydrogenation kinetics compared to
incorporated MgH2 on iron oxide-mesoporous carbon nanocomposite as well as
incorporated MgH2 on mesoporous carbon. This can be attributed to the
particle size of the former being smaller than that of the latter, as well
as much accessible nanosized surface of loaded MgH2.