[en] The combination of results from carbon monoxide chemisorption, X-ray diffraction, and transmission electron microscopy allowed calculating the surface composition of the palladium-copper nanoparticles in Pd-Cu/SiO2 cogelled xerogel catalysts. Values obtained indicate a very pronounced surface enrichment with copper. Surface compositions obtained with this method, which combines three different experimental techniques, are in agreement with the literature data previously obtained for surface segregation in Pd-Cu/SiO2 catalysts by other techniques as low energy ion scattering and X-ray photoelectron spectroscopy. While 1,2-dichloroethane hydrodechlorination over pure palladium mainly produces ethane, increasing copper content in bimetallic catalysts results in an increase in ethylene selectivity, to reach 100% in ethylene selectivity for the sample containing 1.4 wt.% of palladium and 3.0 wt.% of copper. (C) 2004 Elsevier B.V. All rights reserved.
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Lambert, Stéphanie ; Université de Liège - ULiège > Département de chimie appliquée > Génie Chimique - Chimie physique appliquée
Heinrichs, Benoît ; Université de Liège - ULiège > Département de chimie appliquée > Génie Chimique - Chimie physique appliquée
Brasseur, Alain; Université de Liège - ULiège > Département de Chimie appliquée > Génie Chimique - Chimie physique appliquée
Rulmont, André ; Université de Liège - ULiège > Chimie inorganique structurale
Pirard, Jean-Paul ; Université de Liège - ULiège > Département de chimie appliquée > Génie Chimique - Chimie physique appliquée
Language :
English
Title :
Determination of surface composition of alloy nanoparticles and relationships with catalytic activity in Pd-Cu/SiO2 cogelled xerogel catalysts
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