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

Graduate School of Engineering, Hokkaido University, N-13, W-8, Sapporo 060-8628, Japan
Research Department, Creative Research Instituion, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
Author to whom correspondence should be addressed.
Catalysts 2012, 2(3), 344-351;
Received: 23 July 2012 / Revised: 15 August 2012 / Accepted: 29 August 2012 / Published: 10 September 2012
(This article belongs to the Special Issue Bimetallic Catalysts—Application in Hydrogen Storage)
PDF [2322 KB, uploaded 10 September 2012]


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. View Full-Text
Keywords: MgH2; Nb2O5; catalytic effect; ball-milling MgH2; Nb2O5; catalytic effect; ball-milling

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Ma, T.; Isobe, S.; Wang, Y.; Hashimoto, N.; Ohnuki, S. Catalytic Effect of Nb2O5 in MgH2-Nb2O5 Ball-Milled Composites. Catalysts 2012, 2, 344-351.

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