Temperature-programmed-reduction studies of nickel oxide/alumina catalysts: effects of the preparation method

Chiuping Li, Yu Wen Chen

Research output: Contribution to journalArticlepeer-review

312 Scopus citations

Abstract

Two series of NiO Al2O3 catalysts with various metal loadings were prepared by incipientwetness impregnation and coprecipitation methods. The reducibilities of NiO over these catalysts were investigated by the temperature-programmed reduction (TPR) technique. For impregnated Ni Al2O3 catalysts, more than one species was detected by TPR. At low nickel loadings, the NiOAl2O3 interaction is strong, and at high Ni loadings NiO is observed. NiAl2O4 was not detected at all Ni loadings. For precipitated Ni Al2O3 catalysts, three NiO species are present in the TPR profiles. NiAl2O4 was detected at all Ni loadings. The rate of reduction of NiO on the support depends not only on the chemical nature of the NiO species but also on the rate of nucleation of metallic nickel. At high nickel loadings, owing to the presence of easily reduced Ni species, the rate of reduction is enhanced.

Original languageEnglish
Pages (from-to)457-465
Number of pages9
JournalThermochimica Acta
Volume256
Issue number2
DOIs
StatePublished - 1 Jun 1995

Keywords

  • Catalyst
  • Nickel oxide
  • Nickel/alumina
  • TPR

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