Influence of multiple oxide (Cr2O3/Nb2O5) addition on the sorption kinetics of MgH2

Aep Patah, Akito Takasaki, Janusz S. Szmyd

研究成果: Article

74 引用 (Scopus)

抄録

The influence of multiple additions of two oxides, Cr2O3 and Nb2O5, as additives on the hydrogen sorption kinetics of MgH2 after milling was investigated. We found that the desorption kinetics of MgH2 were improved more by multiple oxide addition than by single addition. Even for the milled MgH2 micrometric size powders, the high hydrogen capacity with fast kinetics were achieved for the powders after addition of 0.2 mol% Cr2O3 + 1 mol% Nb2O5. For this composition, the hydride desorbed about 5 wt.% hydrogen within 20 min and absorbed about 6 wt.% in 5 min at 300 °C. Furthermore, the desorption temperature was decreased by 100 °C, compared to MgH2 without any oxide addition, and the activation energy for the hydrogen desorption was estimated to be about 185 kJ mol-1, while that for MgH2 without oxide was about 206 kJ mol-1.

元の言語English
ページ(範囲)3032-3037
ページ数6
ジャーナルInternational Journal of Hydrogen Energy
34
発行部数7
DOI
出版物ステータスPublished - 2009 4

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sorption
Sorption
Desorption
Hydrogen
Kinetics
Oxides
oxides
kinetics
desorption
hydrogen
Powders
Hydrides
Activation energy
hydrides
activation energy
Chemical analysis
Temperature
temperature

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

Influence of multiple oxide (Cr2O3/Nb2O5) addition on the sorption kinetics of MgH2. / Patah, Aep; Takasaki, Akito; Szmyd, Janusz S.

:: International Journal of Hydrogen Energy, 巻 34, 番号 7, 04.2009, p. 3032-3037.

研究成果: Article

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abstract = "The influence of multiple additions of two oxides, Cr2O3 and Nb2O5, as additives on the hydrogen sorption kinetics of MgH2 after milling was investigated. We found that the desorption kinetics of MgH2 were improved more by multiple oxide addition than by single addition. Even for the milled MgH2 micrometric size powders, the high hydrogen capacity with fast kinetics were achieved for the powders after addition of 0.2 mol{\%} Cr2O3 + 1 mol{\%} Nb2O5. For this composition, the hydride desorbed about 5 wt.{\%} hydrogen within 20 min and absorbed about 6 wt.{\%} in 5 min at 300 °C. Furthermore, the desorption temperature was decreased by 100 °C, compared to MgH2 without any oxide addition, and the activation energy for the hydrogen desorption was estimated to be about 185 kJ mol-1, while that for MgH2 without oxide was about 206 kJ mol-1.",
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AU - Patah, Aep

AU - Takasaki, Akito

AU - Szmyd, Janusz S.

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N2 - The influence of multiple additions of two oxides, Cr2O3 and Nb2O5, as additives on the hydrogen sorption kinetics of MgH2 after milling was investigated. We found that the desorption kinetics of MgH2 were improved more by multiple oxide addition than by single addition. Even for the milled MgH2 micrometric size powders, the high hydrogen capacity with fast kinetics were achieved for the powders after addition of 0.2 mol% Cr2O3 + 1 mol% Nb2O5. For this composition, the hydride desorbed about 5 wt.% hydrogen within 20 min and absorbed about 6 wt.% in 5 min at 300 °C. Furthermore, the desorption temperature was decreased by 100 °C, compared to MgH2 without any oxide addition, and the activation energy for the hydrogen desorption was estimated to be about 185 kJ mol-1, while that for MgH2 without oxide was about 206 kJ mol-1.

AB - The influence of multiple additions of two oxides, Cr2O3 and Nb2O5, as additives on the hydrogen sorption kinetics of MgH2 after milling was investigated. We found that the desorption kinetics of MgH2 were improved more by multiple oxide addition than by single addition. Even for the milled MgH2 micrometric size powders, the high hydrogen capacity with fast kinetics were achieved for the powders after addition of 0.2 mol% Cr2O3 + 1 mol% Nb2O5. For this composition, the hydride desorbed about 5 wt.% hydrogen within 20 min and absorbed about 6 wt.% in 5 min at 300 °C. Furthermore, the desorption temperature was decreased by 100 °C, compared to MgH2 without any oxide addition, and the activation energy for the hydrogen desorption was estimated to be about 185 kJ mol-1, while that for MgH2 without oxide was about 206 kJ mol-1.

KW - Hydrogen sorption

KW - Kinetics

KW - Magnesium hydride

KW - Mechanical milling

KW - Metal oxides

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