TY - JOUR
T1 -
Effects of KNbO
3
catalyst on hydrogen sorption kinetics of MgH
2
AU - Abdul Rahman, Mohd Hilman
AU - Shamsudin, Mohd Alief
AU - Klimkowicz, Alicja
AU - Uematsu, Susumu
AU - Takasaki, Akito
PY - 2019/1/1
Y1 - 2019/1/1
N2 -
The influences of Nb-containing oxides and ternary compound in hydrogen sorption performance were investigated. As faster desorption kinetic and lower activation energy were reported by addition of a ternary compound catalyst such as K
2
NiF
6
, the influence of KNbO
3
on hydrogen storage properties of MgH
2
has been investigated for the first time. The MgH
2
- KNbO
3
composite desorbed 3.9 wt% of hydrogen within 10 min, while MgH
2
and MgH
2
-Nb₂O₅ composites desorbed 0.66 wt% and 3.2 wt% respectively under similar condition. For MgH
2
with other Nb-contained catalysts such as Nb, NbO and Nb₂O
3
, the desorption rate was almost the same as the one registered for as-milled MgH
2
. The analysis of differential scanning calorimetry (DSC) showed that MgH
2
-KNbO
3
composite started to release hydrogen at ∼335 °C which is 50 °C lower compared to as-milled MgH
2
without any additives. The activation energy for the hydrogen desorption was estimated to be about 104 ± 6.8 kJ mol
−1
for this material, while for the as-milled MgH
2
was about 165 ± 2.0 kJ mol
−1
. It is believed that Nb-ternary oxide catalyst (KNbO
3
) showed a good catalytic effect and enhance the sorption kinetics of MgH
2
.
AB -
The influences of Nb-containing oxides and ternary compound in hydrogen sorption performance were investigated. As faster desorption kinetic and lower activation energy were reported by addition of a ternary compound catalyst such as K
2
NiF
6
, the influence of KNbO
3
on hydrogen storage properties of MgH
2
has been investigated for the first time. The MgH
2
- KNbO
3
composite desorbed 3.9 wt% of hydrogen within 10 min, while MgH
2
and MgH
2
-Nb₂O₅ composites desorbed 0.66 wt% and 3.2 wt% respectively under similar condition. For MgH
2
with other Nb-contained catalysts such as Nb, NbO and Nb₂O
3
, the desorption rate was almost the same as the one registered for as-milled MgH
2
. The analysis of differential scanning calorimetry (DSC) showed that MgH
2
-KNbO
3
composite started to release hydrogen at ∼335 °C which is 50 °C lower compared to as-milled MgH
2
without any additives. The activation energy for the hydrogen desorption was estimated to be about 104 ± 6.8 kJ mol
−1
for this material, while for the as-milled MgH
2
was about 165 ± 2.0 kJ mol
−1
. It is believed that Nb-ternary oxide catalyst (KNbO
3
) showed a good catalytic effect and enhance the sorption kinetics of MgH
2
.
KW - Activation energy
KW - Catalyst
KW - Hydrogen storage materials
KW - Magnesium hydride
KW - Sorption kinetic
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U2 - 10.1016/j.ijhydene.2019.02.186
DO - 10.1016/j.ijhydene.2019.02.186
M3 - Article
AN - SCOPUS:85063123779
SN - 0360-3199
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
ER -