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metadata.dc.type: | Artigo de Periódico |
Title: | Alumina-supported Pd, Ag and Pd–Ag catalysts: preparation through the polyol process, characterization and reactivity in hexa-1,5-diene hydrogenation |
Other Titles: | Applied Catalysis A: General |
Authors: | Sales, Emerson Andrade Benhamida, Béatrice Caizergues, Virginie Lagier, Jean Pierre Fiévet, Fernand Bozon Verduraz, François |
metadata.dc.creator: | Sales, Emerson Andrade Benhamida, Béatrice Caizergues, Virginie Lagier, Jean Pierre Fiévet, Fernand Bozon Verduraz, François |
Abstract: | Palladium and palladium–silver catalysts, supported on γ-alumina, were prepared by precipitation in a liquid polyol and characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The catalysts were tested in the hydrogenation of hexa-1,5-diene in liquid phase, at 313 K. The addition of silver improved the hex-1-ene fractional selectivity in all cases, but lowered the catalyst activity when the Pd/Ag ratio was about unity. On the other hand a palladium-rich (Pd/Ag=4) bimetallic catalyst exhibited a very good activity and a good selectivity to hex-1-ene as well. The effects of silver addition are ascribed to the dilution of palladium atoms by silver atoms, which prevents the isomerisation of hexa-1,5-diene. Hence, the polyol method, which has been used up to now to prepare metal powders with controlled morphology, appears of interest in the elaboration of supported metal catalysts. |
Keywords: | Hexa-1,5-diene Liquid phase hydrogenation Palladium±silver catalysts Polyol process |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/8194 |
Issue Date: | 1998 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
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