Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 35, Issue 11, Pages 5895-5901Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2009.12.120
Keywords
Nickel; Mesoporous SBA-15 and Al-SBA-15 supports; Ethanol steam reforming
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A series of Ni catalysts supported on Al-SBA-15 mesoporous materials (Si/Al = 20, 60, 140, 240, infinity) was prepared and tested in ethanol steam reforming. The catalysts were characterized by XRD, H-2-TPR, NH3-TPD, TEM, ICP-AES, Al-27-MAS-NMR and N-2-sorption measurements. It was found that the incorporation of Al atoms into SBA-15 structure is responsible for the formation of catalyst acid sites, an increase of the size of nickel species and stronger metal-support interaction between Ni and Al-SBA-15 carrier. Regarding ethanol steam reforming, catalysts with higher Al content keep ethanol conversion along time. However, Ni/Al-SBA-15 catalysts produce larger amounts of ethylene and coke, with slightly lower hydrogen selectivity than Ni/SBA-15. This is the consequence of ethanol dehydration in Ni/Al-SBA-15 acid sites, while ethanol dehydrogenation mechanism predominates in Ni/SBA-15 catalyst. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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