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Artículos en revistas:
Influence of the chemical activation of carbon nanofibers on their use as catalyst support
Año:2011
Áreas de investigación
  • Tecnología química
Datos
Descripción
Three nickel catalysts supported on carbon nanofibers (CNFs) have been prepared by deposition-precipitation (ca. 3%, w/w). The CNFs were prepared by catalytic chemical vapour decomposition of ethylene over a Ni/SiO 2 catalyst, and chemically activated with RbOH (CNF RbOH) and KOH (CNF KOH). The materials were characterized by transmission electron microscopy (TEM), N 2 adsorption-desorption, temperature-programmed oxidation, X-ray diffraction (XRD), acid-base titrations and temperature-programmed decomposition in helium. KOH was the most effective activating agent, developing carbon porosity, decreasing the crystalline character and increasing surface acidity to a higher extent. After nickel introduction, the catalysts were characterized by temperature-programmed reduction, XRD, TEM, N 2 adsorption-desorption and acid-base titrations. Surface-area weighted mean Ni particle diameters (post reduction at 400 °C) followed the sequence: Ni/CNF KOH (4.9 nm) < Ni/CNF RbOH (8.6 nm) < Ni/CNF (25.5 nm), where a further activation of the support led to smaller/better dispersed nickel particles. The surface acidity of the catalysts followed the sequence: Ni/CNF RbOH < Ni/CNF < Ni/CNF KOH. The gas phase hydrogenation of butyronitrile was used as a surface characterization test, where bigger nickel particles consistently developed higher catalytic activity. Selectivity, however, was not sensitive to metal particle size, but increased towards condensation products with increasing catalyst acidity.
Internacional
Si
JCR del ISI
Si
Título de la revista
Applied Catalysis A: General
ISSN
0926860X
Factor de impacto JCR
0
Información de impacto
Volumen
DOI
Número de revista
Desde la página
78
Hasta la página
87
Mes
SIN MES
Ranking
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Participantes
  • Autor: Antonio Nieto-Marquez Ballesteros (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Caracterización óptica de materiales
  • Departamento: Química Industrial y Polímeros
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