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Advantages of high surface area niobium oxide catalysts on MgH2 sorption properties

Published online by Cambridge University Press:  01 February 2011

Vinay V Bhat ,
Aline Rougier ,
Luc Aymard ,
Gholam A Nazri  and
Jean-Marie Tarascon
Vinay V Bhat
Affiliation:
vinay.bhat@gmail.com, LRCS, Chemistry, 33 rue St. Leu, Amiens, N/A, 80039, France, 33 322 827604, 33 322 827590
Aline Rougier
Affiliation:
aline.rougier@sc.u-picardie.fr, U-Picardie, LRCS, 33 rue St Leu, Amiens, Picardie, 80039, France
Luc Aymard
Affiliation:
luc.aymard@sc.u-picardie.fr, U-Picardie, LRCS, 33 rue St Leu, Amiens, Picardie, 80039, France
Gholam A Nazri
Affiliation:
g.nazri@gm.com, GM, Warren, Michigan, 48090-9055, United States
Jean-Marie Tarascon
Affiliation:
jean-marie.tarascon@sc.u-picardie.fr, U-Picardie, LRCS, 33 rue St Leu, Amiens, Picardie, 80039, France
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Abstract

We report the synthesis by ‘chimie douce’ route of high surface area (200 m2/g) nano crystalline Nb2O5 (so called p-Nb2O5) and the importance of its addition to enhance the hydrogen sorption properties of MgH2. All of the prepared Nb2O5 catalysts induce faster kinetics, up to twice the desorption rate, than commonly used commercial Nb2O5. Among them, both p-Nb2O5 and Nb2O5:350 (p-Nb2O5 heated to 350 °C) exhibit the best catalytic activity, since a 5.2 wt% hydrogen desorption was achieved at 300 °C for (MgH2)p−Nb2O5, as compared to less than 4 wt.% for commercial Nb2O5 added MgH2, (MgH2)c−Nb2O5, within 12 min. Furthermore, due to the addition of high surface area Nb2O5, the desorption temperature was successfully lowered down to 200 °C, with a significant amount of desorbed hydrogen (4.5 wt%). In contrast at this “low” temperature, (MgH2)c−Nb2O5 shows no desorption.

Keywords

catalyticmechanical alloyingMg
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 927: Symposium EE – Hydrogen Storage Materials , 2006 , 0927-EE04-02
Copyright
Copyright © Materials Research Society 2006

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