Effects of KNbO 3 catalyst on hydrogen sorption kinetics of MgH 2

Mohd Hilman Abdul Rahman, Mohd Alief Shamsudin, Alicja Klimkowicz, Susumu Uematsu, Akito Takasaki

研究成果: Article

抄録

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 .

元の言語English
ジャーナルInternational Journal of Hydrogen Energy
DOI
出版物ステータスPublished - 2019 1 1

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sorption
Sorption
catalysts
Desorption
Hydrogen
Catalysts
Kinetics
kinetics
hydrogen
desorption
Composite materials
Activation energy
composite materials
Oxides
activation energy
Hydrogen storage
oxides
Differential scanning calorimetry
heat measurement
scanning

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

これを引用

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title = "Effects of KNbO 3 catalyst on hydrogen sorption kinetics of MgH 2",
abstract = "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 .",
keywords = "Activation energy, Catalyst, Hydrogen storage materials, Magnesium hydride, Sorption kinetic",
author = "{Abdul Rahman}, {Mohd Hilman} and Shamsudin, {Mohd Alief} and Alicja Klimkowicz and Susumu Uematsu and Akito Takasaki",
year = "2019",
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language = "English",
journal = "International Journal of Hydrogen Energy",
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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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