INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
artículos
Título:
Deposition of Pt nanoparticles on different carbonaceous materials by using different preparation methods for PEMFC electrocatalysts
Autor/es:
NATALIA VEIZAGA, JOSE FERNANDEZ, MARIANO BRUNO, OSVALDO SCELZA, SERGIO DE MIGUEL
Revista:
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2012
ISSN:
0360-3199
Resumen:
PtSn/Al2O3 and PtSn/Al2O3?Na catalysts display
important modifications of the metallic phase with
respect to Pt/Al2O3 one. In this sense, TPR and XPS results
show the presence of strong interactions between Pt and
Sn, with probable alloy formation, which would be
responsible for the decrease of the reaction rate and the
increase of the activation energy in cyclohexane dehydrogenation.
Besides the experiments of cyclopentane
hydrogenolysis show that the alkali metal addition to
bimetallic PtSn/Al2O3 catalysts completely eliminates the
hydrogenolytic ensembles, which could be due to a geometric
modification of the metallic phase. These important
modifications in the nature of the metallic function due to
the simultaneous addition of Na and Sn to Pt/Al2O3 are
responsible for the excellent catalytic performance in the2O3 and PtSn/Al2O3?Na catalysts display
important modifications of the metallic phase with
respect to Pt/Al2O3 one. In this sense, TPR and XPS results
show the presence of strong interactions between Pt and
Sn, with probable alloy formation, which would be
responsible for the decrease of the reaction rate and the
increase of the activation energy in cyclohexane dehydrogenation.
Besides the experiments of cyclopentane
hydrogenolysis show that the alkali metal addition to
bimetallic PtSn/Al2O3 catalysts completely eliminates the
hydrogenolytic ensembles, which could be due to a geometric
modification of the metallic phase. These important
modifications in the nature of the metallic function due to
the simultaneous addition of Na and Sn to Pt/Al2O3 are
responsible for the excellent catalytic performance in the2O3 one. In this sense, TPR and XPS results
show the presence of strong interactions between Pt and
Sn, with probable alloy formation, which would be
responsible for the decrease of the reaction rate and the
increase of the activation energy in cyclohexane dehydrogenation.
Besides the experiments of cyclopentane
hydrogenolysis show that the alkali metal addition to
bimetallic PtSn/Al2O3 catalysts completely eliminates the
hydrogenolytic ensembles, which could be due to a geometric
modification of the metallic phase. These important
modifications in the nature of the metallic function due to
the simultaneous addition of Na and Sn to Pt/Al2O3 are
responsible for the excellent catalytic performance in the2O3 catalysts completely eliminates the
hydrogenolytic ensembles, which could be due to a geometric
modification of the metallic phase. These important
modifications in the nature of the metallic function due to
the simultaneous addition of Na and Sn to Pt/Al2O3 are
responsible for the excellent catalytic performance in the2O3 are
responsible for the excellent catalytic performance in the
n-butane dehydrogenation, thus giving high conversions,
selectivities to butenes higher than 95%, and lower deactivation
capacity than those corresponding to bimetallic
PtSn catalysts (with different Sn contents) supported on
undoped alumina. The excellent stability of PtSn/Al2O3?
Na catalysts would be due to a low carbon formation
during the reaction,-butane dehydrogenation, thus giving high conversions,
selectivities to butenes higher than 95%, and lower deactivation
capacity than those corresponding to bimetallic
PtSn catalysts (with different Sn contents) supported on
undoped alumina. The excellent stability of PtSn/Al2O3?
Na catalysts would be due to a low carbon formation
during the reaction,2O3?
Na catalysts would be due to a low carbon formation
during the reaction,