Electron distribution of small Ni particles and Ce ions in X and Y zeolites related to their catalytic properties

  • F. Vergand
  • H. Roulet
  • G. Dufour
  • C. Bonnelle
  • E. Ramaroson
  • J. F. Tempere
  • M. F. Guilleux
  • D. Delafosse
Conference paper

Abstract

Catalytic behaviour of nickel particles smaller than 1.3 nm, encaged in X and Y zeolites, in the presence of Ce3 +, is related to their electronic properties. In general the rates of reaction are lower than those of a standard catalyst made of 2.5 nm nickel particles on SiO2; this is attributed to the strong localization of the Ni 3d states due to the size effect. However a high rate, more than twice the standard, is found for Ni in X zeolite, in relation with a Ni 3d 10 configuration. On the other hand the fragmentation of butane is deeper with Ni in Y support than in X support and this corresponds to a high density of Ni d states at the Fermi level.

PACS

79.60 36.40 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • F. Vergand
    • 1
  • H. Roulet
    • 1
  • G. Dufour
    • 1
  • C. Bonnelle
    • 1
  • E. Ramaroson
    • 2
  • J. F. Tempere
    • 2
  • M. F. Guilleux
    • 2
  • D. Delafosse
    • 2
  1. 1.Laboratoire de Chimie PhysiqueUniversité Pierre et Marie CurieParis Cedex 05France
  2. 2.Laboratoire de Réactivité de Surface et StructureParis Cedex 05France

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