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Type: Artigo de periódico
Title: Infrared And X-ray Photoelectron Spectroscopy Study Of Chloride Effect In Palladium Catalysts [estudo Do Efeito Do Cloreto Em Catalisadores De Paládio Usando A Análise No Infravermelho E De Fotoelétrons Excitados Por Raios X]
Author: Cunha E.V.
Faccin F.
Moro C.C.
Benvenutti E.V.
De Castro S.C.
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 3d 5/2 binding energy in the chloride presence. A similar poisoning effect was also observed for chloride free Pd/Al 2O 3 reduced at 500°C, 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.
Citation: Quimica Nova. , v. 25, n. 3, p. 392 - 395, 2002.
Rights: aberto
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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