Effect of Pt and Pd promoter on Ni supported catalysts: A TPR/TPO/TPD and microcalorimetry study

Tanksale, A., Beltramini, J. N., Dumesic, J. A. and Lu, G. Q. (2008) Effect of Pt and Pd promoter on Ni supported catalysts: A TPR/TPO/TPD and microcalorimetry study. Journal of Catalysis, 258 2: 366-377. doi:10.1016/j.jcat.2008.06.024


Author Tanksale, A.
Beltramini, J. N.
Dumesic, J. A.
Lu, G. Q.
Title Effect of Pt and Pd promoter on Ni supported catalysts: A TPR/TPO/TPD and microcalorimetry study
Journal name Journal of Catalysis   Check publisher's open access policy
ISSN 0021-9517
Publication date 2008-09-10
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.jcat.2008.06.024
Volume 258
Issue 2
Start page 366
End page 377
Total pages 12
Editor E. Inglesia
Place of publication Maryland Heights, MO, U.S.A.
Publisher Academic Press
Collection year 2009
Language eng
Subject C1
850501 Biofuel (Biomass) Energy
030601 Catalysis and Mechanisms of Reactions
Abstract The promoting effect of Pt and Pd in bimetallic Ni-Pt and Ni-Pd catalysts supported on alumina nano-fibre (Alnf) were tested for the liquid phase reforming of sorbitol to produce hydrogen. The mono and bimetallic catalysts were studied by different characterisation techniques such as: temperature programmed reduction, oxidation, CO desorption, microcalorimetry, TEM and STEM/EDX. Although bimetallic catalysts have long been the subject of great interest because of their exceptional properties compared to the monometallic catalysts, the reason behind their improved activity is still a question of debate. Experimental evidence showed that the addition of both Pt and Pd-even in a very small fraction-to the Ni catalyst increases its reducibility significantly. The TEM and STEM/EDX analysis confirmed that Pt and Ni are present as alloys in nano-sized rod shaped particles. At the same time it was found that the CO differential heat of adsorption is appreciably lowered in the bimetallic catalysts. This is substantial because reducing the CO binding strength can avoid the poisoning of the active metal sites. As a result, we demonstrate that the rate of H-2 formation from sorbitol reforming was 3 to 5 times higher for bimetallic catalysts when compared to the monometallic catalysts. (C) 2008 Elsevier Inc. All rights reserved.
Keyword Bimetallic catalysts
TPR
TPD
Microcalorimetry
Sorbitol reforming
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes DOI: 10.1016/j.jcat.2008.06.024

 
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Created: Fri, 17 Apr 2009, 12:49:08 EST by Vicki Thompson on behalf of School of Chemical Engineering