Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Influence of the chemical activation of carbon nanofibers on their use as catalyst support
Year:2011
Research Areas
  • Chemistral tecnology
Information
Abstract
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.
International
Si
JCR
Si
Title
Applied Catalysis A: General
ISBN
0926860X
Impact factor JCR
0
Impact info
Volume
Journal number
From page
78
To page
87
Month
SIN MES
Ranking
Participants
  • Autor: Antonio Nieto-Marquez Ballesteros (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Caracterización óptica de materiales
  • Departamento: Química Industrial y Polímeros
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)