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• Ma, T
• Isobe, S
• Wang, Y
• Hashimoto, N
• Ohnuki, S
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• Ma, T
• Isobe, S
• Wang, Y
• Hashimoto, N
• Ohnuki, S
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• Ma, T
• Isobe, S
• Wang, Y
• Hashimoto, N
• Ohnuki, S

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Catalysts 2012, 2(3), 344-351; doi:10.3390/catal2030344

Article

Catalytic Effect of Nb₂O₅ in MgH₂-Nb₂O₅ Ball-Milled Composites

Tao Ma ¹ , Shigehito Isobe ^1,2,* , Yongming Wang ¹ , Naoyuki Hashimoto ¹  and Somei Ohnuki ¹

¹ Graduate School of Engineering, Hokkaido University, N-13, W-8, Sapporo 060-8628, Japan ² Research Department, Creative Research Instituion, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan

* Author to whom correspondence should be addressed.

Received: 23 July 2012; in revised form: 15 August 2012 / Accepted: 29 August 2012 / Published: 10 September 2012

(This article belongs to the Special Issue Bimetallic Catalysts—Application in Hydrogen Storage)

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Abstract: We report a study on the desorption properties, crystallography and chemical state of MgH₂ and 1 mol% Nb₂O₅ ball-milled composites. Desorption temperatures of the composites decreased with increase of ball-milling time. Size of MgH₂ crystallites decreased during ball-milling. Reduction of Nb₂O₅ after ball-milling was confirmed by tracing the chemical state of Nb and was further supported by TEM observation. The reduced phases may act as more effective catalysts improving the desorption properties.

Keywords: MgH₂; Nb₂O₅; catalytic effect; ball-milling

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