Evidence of composition deviation of metal particles of a Ni-Cu/Al2O3 catalyst during methane decomposition to COx-free hydrogen

Li, Douxing, Chen, Jiuling and Li, Yongdan (2009) Evidence of composition deviation of metal particles of a Ni-Cu/Al2O3 catalyst during methane decomposition to COx-free hydrogen. International Journal of Hydrogen Energy, 34 1: 299-307. doi:10.1016/j.ijhydene.2008.09.106


Author Li, Douxing
Chen, Jiuling
Li, Yongdan
Title Evidence of composition deviation of metal particles of a Ni-Cu/Al2O3 catalyst during methane decomposition to COx-free hydrogen
Formatted title
Evidence of composition deviation of metal particles of a Ni–Cu/Al2O3 catalyst during methane decomposition to COx-free hydrogen
Journal name International Journal of Hydrogen Energy   Check publisher's open access policy
ISSN 0360-3199
1879-3487
Publication date 2009-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.ijhydene.2008.09.106
Volume 34
Issue 1
Start page 299
End page 307
Total pages 9
Place of publication Oxford, U.K.
Publisher Elsevier
Collection year 2009
Language eng
Subject C1
05 Environmental Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0306 Physical Chemistry (incl. Structural)
Formatted abstract
A coprecipitated Ni–Cu/Al2O3 catalyst was examined in a fluidized bed reactor for the decomposition of methane to COx-free hydrogen and carbon nanofibers using two different reaction temperature schemes, i.e. constant temperature and pre-induction operation. At constant temperatures, the catalyst showed quasi-stable activity below 913 K for a notable time period, while its performance decayed fast above this temperature and a quick deactivation was observed at 1013 K. However, for reaction at 1013 K, the durability was improved if the catalyst was induced for 10 min at 823 K in the reaction atmosphere. A detailed examination of the metal particles after reaction with EDS revealed that the composition of the metal particle depended strongly on the reaction temperature and the induction scheme. The metal particles in the reduced catalyst showed a composition deviation also. The HRTEM micrographs of the carbon–metal interface and the EDS results support the surface migration and ensemble mechanism for carbon formation and give evidence for the reconstruction of the metal particles during the induction period.
Keyword Methane decomposition
Ni–Cu/Al2O3 catalyst
Composition deviation of metal tips
Carbon nanofibers
COx-free hydrogen
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 29 November 2008

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Chemical Engineering Publications
ERA 2012 Admin Only
 
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Created: Wed, 10 Jun 2009, 17:19:36 EST by Siona Saplos on behalf of Research Management Office