Improvement of hydrogen sorption properties of MgH2 with various sizes and stoichiometric compositions of TiC
- Improvement of hydrogen sorption properties of MgH2 with various sizes and stoichiometric compositions of TiC
- 신정훈; 이길재; 조영환; 이경섭
- Hydrogen storage; Magnesium hydride; Catalyst; TiC; Nanopowder
- Issue Date
- Catalysis today
- VOL 146, NO 1-2, 209-215
- Nano TiC powders having various sizes (50 nm, 130 nm, 300 nm and 600 nm) were added to MgH2 by
high-energy ball milling to improve the hydrogenation properties of MgH2. The amount of hydrogen
desorption/absorption of MgH2 catalyzed with TiC was slightly decreased, but MgH2 with 1 mol% TiC
showed considerable catalytic effects on both the dehydrogenation and hydrogenation kinetics of MgH2.
MgH2 with 50 nm TiC had the best absorption/desorption kinetics of MgH2 and the highest cyclic
performance, desorbing about 6.2 wt.% H2 within about 20 min and absorbing more than 90% of
hydrogen capacity within 5 min at 300 8C.
The size of TiC was the important factor in inducing the catalytic effect, but the change of TiC
composition was not as important as the particle size. Because by changing of particle sizes of TiC led to
significant progress of dehydrogenation, but there was neither improvement of hydrogenation
properties nor reaction kinetics by variation of TiC composition.
X-ray diffraction analysis confirmed that nano-sized TiC remained stable with MgH2 after five cyclic
tests in accordance with the prediction of thermodynamic calculation.
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