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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.|
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|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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