Title Modification of the catalytic behaviour of platinum by zinc in crotonaldehyde hydrogenation and iso-butane dehydrogenation
Authors Silvestre-Albero, J , SERRANO RUIZ, JUAN CARLOS, Sepulveda-Escribano, A , Rodriguez-Reinoso, F
External publication Si
Means Appl. Catal. A-Gen.
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 2.72800
SJR Impact 1.69600
Publication date 18/09/2005
ISI 000234202200026
DOI 10.1016/j.apcata.2005.06.005
Abstract The effect of the presence of zinc on the catalytic behaviour of platinum in the vapour phase hydrogenation of crotonaldehyde (2-butenal) and in iso-butane dehydrogenation has been determined in activated carbon-supported catalysts prepared using H2PtCl6 and Zn(NO3)(2) as the metal precursors. The catalysts have been characterised by temperature-progranimed reduction (TPR), adsorption microcalorimetry of CO at room temperature and X-ray photoelectron spectroscopy after in situ reduction at 773 K. The bimetallic catalyst, with a bulk Zn/Pt atomic ratio of 13.7. showed a much higher initial activity in crotonaldehyde hydrogenation, although it deactivated more strongly with time on stream. Lower activation energy for this reaction was also obtained, as well as a higher selectivity towards the unsaturated alcohol. On the other hand, the catalytic behaviour for iso-butane dehydrogenation was greatly improved by the presence of zinc, the bimetallic catalyst being more active than its monometallic counterpart and showing 100% selectivity to iso-butene. (c) 2005 Published by Elsevier B.V.
Keywords Pt-Zn; selective hydrogenation; dehydrogenation; adsorption microcalorimetry; XPS
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