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

doi:10.1016/j.ijhydene.2019.02.186

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 journal › Article › peer-review

9 Citations (Scopus)

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 language	English
Journal	International Journal of Hydrogen Energy
DOIs	https://doi.org/10.1016/j.ijhydene.2019.02.186
Publication status	Published - 2019 Jan 1

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

Access to Document

10.1016/j.ijhydene.2019.02.186

Cite this

Abdul Rahman, M. H., Shamsudin, M. A., Klimkowicz, A., Uematsu, S., & Takasaki, A. (2019). Effects of KNbO ₃ catalyst on hydrogen sorption kinetics of MgH ₂ International Journal of Hydrogen Energy. https://doi.org/10.1016/j.ijhydene.2019.02.186

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 journal › Article › peer-review

Abdul Rahman, MH, Shamsudin, MA, Klimkowicz, A, Uematsu, S & Takasaki, A 2019, ' Effects of KNbO ₃ catalyst on hydrogen sorption kinetics of MgH ₂ ', International Journal of Hydrogen Energy. https://doi.org/10.1016/j.ijhydene.2019.02.186

Abdul Rahman MH, Shamsudin MA, Klimkowicz A, Uematsu S, Takasaki A. Effects of KNbO ₃ catalyst on hydrogen sorption kinetics of MgH ₂ International Journal of Hydrogen Energy. 2019 Jan 1. https://doi.org/10.1016/j.ijhydene.2019.02.186

Abdul Rahman, Mohd Hilman ; Shamsudin, Mohd Alief ; Klimkowicz, Alicja ; Uematsu, Susumu ; Takasaki, Akito. / Effects of KNbO ₃ catalyst on hydrogen sorption kinetics of MgH ₂ In: International Journal of Hydrogen Energy. 2019.

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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",

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AU - Klimkowicz, Alicja

AU - Uematsu, Susumu

AU - Takasaki, Akito

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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 .

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