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Supporting metal catalysts on modified carbon nanocones to optimize dispersion and particle size

Published online by Cambridge University Press:  31 January 2011

Paolo Matelloni ,
David M. Grant  and
Gavin S. Walker
Paolo Matelloni
Affiliation:
emxpm2@nottingham.ac.uk, University of Nottingham, Nottingham, United Kingdom
David M. Grant
Affiliation:
David.Grant@nottingham.ac.uk, University of Nottingham, Nottingham, United Kingdom
Gavin S. Walker
Affiliation:
gavin.walker@nottingham.ac.uk, University of Nottingham, Nottingham, United Kingdom
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Abstract

Carbon nanocones are the fifth allotropic form of carbon, first synthesized in 1997. They have been selected for investigating hydrogen storage capacity, because initial temperature programmed desorption experiments found a significant amount of hydrogen was evolved at ambient temperatures. The aim of this work was to study the effect of impregnation conditions on metal catalyst dispersion and to investigate whether the metal loaded cones had improved hydrogen storage characteristics. Pre-treatment of carbon nanocones with hydrogen peroxide was carried out, followed by metal decoration in aqueous solution by an incipient wetness technique. Two methods of reducing the metal catalyst have been applied: in hydrogen at room temperature (RT) and in an aqueous solution of NaBH4. XRD confirmed the complete metal reduction and TEM showed that the reduction technique affected the catalyst dispersion. Very fine dispersions of ca. 1 nm diameter metal clusters at catalyst loadings of 5 wt.% were achieved and high dispersions were retained for loadings as high as 15 wt.%. Hydrogen uptakes at RT were measured and an increase with metal loading was observed.

Keywords

Pdgrain sizehydrogenation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1216: Symposium W – Hydrogen Storage Materials , 2009 , 1216-W02-02
Copyright
Copyright © Materials Research Society 2010

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