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X-ray PHoto-Emission Studies of Strong Metal-Support Interaction (SMSI): Metal Decoration and Electronic Effects

X-ray PHoto-Emission Studies of Strong Metal-Support Interaction (SMSI): Metal Decoration and Electronic Effects

Authors :
Robert F. Hicks
Theo H. Fleisch
J.R. Regalbuto
R.T. Thomson
Eduardo E. Wolf
Alexis T. Bell
G.S. Lane
Publication Year :
1988
Publisher :
Elsevier, 1988.

Abstract

Metal-support and metal-promoter interactions have been studied by x-ray photoelectron spectroscopy. Decoration of the metal particles by metal oxide species is observed for Pd in contact with La 2 O 3 , Pt in contact with WO 3 , and Pt in contact with TiO 2 . In every case where decoration occurs, there is also a negative shift in the apparent binding energy of the core electron levels of the metal after reduction in hydrogen at elevated temperatures. The shift can be as great as −0.7 eV relative to the bulk foil value. Charging of insulating catalyst powders makes it difficult to establish the binding energy reference level within the sample. However, analysis of the charging behavior suggests that the negative shift may result from a change in the electronic properties of the metal surface.

Details

Database :
OpenAIRE
Accession number :
edsair.doi...........247b5534b5590c7497b80d04d8a90271
Full Text :
https://doi.org/10.1016/s0167-2991(09)60707-2