Catalysis Letters

, Volume 17, Issue 1–2, pp 29–37 | Cite as

Strong metal-support interaction in Ni/TiO2 catalysts: in situ EXAFS and related studies

  • T. Arunarkavalli
  • G. U. Kulkarni
  • G. Sankar
  • C. N. R. Rao
Article

Abstract

In situ EXAFS and X-ray diffraction investigations of Ni/TiO2 catalysts show that NiTiO3 is formed as an intermediate during calcination of catalyst precursors prepared by the wet-impregnation method; the intermediate is not formed when ion-exchange method is used for the preparation. On hydrogen reduction, NiTiO3 gives rise to Ni particles dispersed in the TiO2(rutile) matrix. The occurrence of the anatase-rutile transformation of the TiO2 support, the formation and subsequent decomposition/reduction of NiTiO3 as well as the unique interface properties of the Ni particles are all factors of importance in giving rise to metal-support interaction. Active TiO2(anatase) prepared from gel route gives an additional species involving Ni3+.

Keywords

SMSI strong metal-support interaction Ni/TiO2 catalyst EXAFS of catalysts 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1993

Authors and Affiliations

  • T. Arunarkavalli
    • 1
  • G. U. Kulkarni
    • 1
  • G. Sankar
    • 1
  • C. N. R. Rao
    • 1
  1. 1.Solid State and Structural Chemistry Unit and CSIR Centre of Excellence in ChemistryIndian Institute of ScienceBangaloreIndia

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