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Título | Estudo do efeito do cloreto em catalisadores de paládio usando a análise no infravermelho e de fotoelétrons excitados por raios X |
Outro título | Infrared and x-ray photoelectron spectroscopy study of chloride effect in palladium catalysts |
Autor |
Cunha, Eduardo V. da
Faccin, Flavio Moro, Celso Camilo Benvenutti, Edilson Valmir 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. |
Contido em | Química nova. São Paulo. Vol. 25, n. 3 (2002), p. 392-395 |
Assunto |
Catalisadores : Paládio
Cloreto Espectroscopia : Infravermelho Espectroscopia fotoeletrônica de raio-x [en] Chloride poisoning effect [en] Infrared [en] XPS |
Origem | Nacional |
Tipo | Artigo de periódico |
URI | http://hdl.handle.net/10183/72968 |
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