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Type: Artigo de periódico
Title: Estudo do efeito do cloreto em catalisadores de paládio usando a análise no infravermelho e de fotoelétrons excitados por raios x
Title Alternative: Infrared and x-ray photoelectron spectroscopy study of chloride effect in palladium catalysts
Author: Cunha, Eduardo V.
Faccin, Flávio
Moro, Celso C.
Benvenutti, Edilson V.
Castro, Sandra C. de
Abstract: Chloride poisoning is known as having an inhibitor effect in the activity of metal catalysis. In this work in situ infrared spectroscopy (FTIR) of adsorbed carbon monoxide and x-ray photoelectron spectroscopy (XPS) were used to investigate the effect of chloride presence in the electronic metal density in the d subshell of palladium dispersed on alumina. The chloride poisoning effect was interpreted as an electronic effect since a weak back-bonded Pd-CO was formed due to the decrease in the electronic density of the d subshell of palladium, which could be also detected by the higher Pd 3d5/2 binding energy in the chloride presence. A similar poisoning effect was also observed for chloride free Pd/Al2O3 reduced at 500 ºC, and it was interpreted based on the interaction of metal with the alumina surface. The use of molybdena/alumina binary system as support, yield a contrary effect due to the metal-support interaction.
Subject: chloride poisoning effect
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0100-40422002000300011
Date Issue: 1-May-2002
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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