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A study of strong metal-support interaction based on an electron spectroscopic investigation of nitrogen adsorption on simulated Ni/TiO2, Ni/Al2O3, and related catalyst surfaces
, C. N. R. Rao
Published in American Chemical Society
1990
Volume: 94
   
Issue: 20
Pages: 7986 - 7991
Abstract
Adsorption of nitrogen on Ni/TiO2, Ni/Al2O3, Ni/Al, Ni-Ti alloy, TiO2, and other surfaces prepared in situ in an electron spectrometer has been investigated by X-ray and UV photoelectron spectroscopy to understand the nature of the strong metal-support interaction (SMSI) state in the annealed Ni/TiO2 catalyst system. The annealed Ni/TiO2 surface has a considerable proportion of Ti3+ and exhibits dissociative adsorption of N2 along with weak molecular chemisorption at 80 K just as a Ni-Ti alloy surface. This is in contrast with the nonannealed Ni/TiO2 surface where there is only molecular chemisorption at 80 K similar to the Ni/Al2O3 surface. The adsorption behavior of the annealed Ni/TiO2 surface is also different from that of TiO2 (showing only physisorption), TiOx (reduced surface showing physisorption and dissociation) or N i/TiOx (dissociation and stronger chemisorption as on Ni/TiO2). It is suggested that the annealed Ni/TiO2 surface may correspond to the SMSI state. © 1990 American Chemical Society.
About the journal
JournalData powered by TypesetJournal of Physical Chemistry
PublisherData powered by TypesetAmerican Chemical Society
ISSN00223654
Open AccessYes