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

Aep Patah; Akito Takasaki; Janusz S. Szmyd

doi:10.1016/j.ijhydene.2009.01.086

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

Aep Patah, Akito Takasaki, Janusz S. Szmyd

Research output: Contribution to journal › Article › peer-review

83 Citations (Scopus)

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.

Original language	English
Pages (from-to)	3032-3037
Number of pages	6
Journal	International Journal of Hydrogen Energy
Volume	34
Issue number	7
DOIs	https://doi.org/10.1016/j.ijhydene.2009.01.086
Publication status	Published - 2009 Apr

Keywords

Hydrogen sorption
Kinetics
Magnesium hydride
Mechanical milling
Metal oxides

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.2009.01.086

Cite this

@article{9aee394305a04d60a95174a30d90bc27,

title = "Influence of multiple oxide (Cr2O3/Nb2O5) addition on the sorption kinetics of MgH2",

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.",

keywords = "Hydrogen sorption, Kinetics, Magnesium hydride, Mechanical milling, Metal oxides",

author = "Aep Patah and Akito Takasaki and Szmyd, {Janusz S.}",

note = "Funding Information: This work was partially supported by the European Commission (project Dev-BIOSOFC , FP6-042436, MTKD-CT-2006-042436).",

year = "2009",

month = apr,

doi = "10.1016/j.ijhydene.2009.01.086",

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journal = "International Journal of Hydrogen Energy",

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AU - Patah, Aep

AU - Takasaki, Akito

AU - Szmyd, Janusz S.

N1 - Funding Information: This work was partially supported by the European Commission (project Dev-BIOSOFC , FP6-042436, MTKD-CT-2006-042436).

PY - 2009/4

Y1 - 2009/4

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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