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

Research output: Contribution to journalArticle

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 .

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
DOIs
Publication statusPublished - 2019 Jan 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

Keywords

  • Activation energy
  • Catalyst
  • Hydrogen storage materials
  • Magnesium hydride
  • Sorption kinetic

ASJC Scopus subject areas

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

Cite this

Effects of KNbO 3 catalyst on hydrogen sorption kinetics of MgH 2 . / Abdul Rahman, Mohd Hilman; Shamsudin, Mohd Alief; Klimkowicz, Alicja; Uematsu, Susumu; Takasaki, Akito.

In: International Journal of Hydrogen Energy, 01.01.2019.

Research output: Contribution to journalArticle

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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 .",
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AU - Takasaki, Akito

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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 .

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