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Surface studies and catalytic properties of the bifunctional bulk MoO 2 system
Author(s) -
Katrib A.,
Sobczak J. W.,
Krawczyk M.,
Zommer L.,
Benadda A.,
Jablonski A.,
Maire G.
Publication year - 2002
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1288
Subject(s) - bifunctional , x ray photoelectron spectroscopy , catalysis , chemistry , hydrogen , isomerization , metal , analytical chemistry (journal) , inorganic chemistry , chemical engineering , organic chemistry , engineering
X‐ray photoelectron spectroscopy measurements of commercial bulk MoO 2 revealed the presence of MoO 3 and Mo 2 O 5 phases in the sample surface region. In situ hydrogen reduction at different temperatures up to 650 K enabled to be reduced Mo 6+ and Mo 5+ to Mo 4+ . Bulk MoO 2 as prepared by hydrogen reduction of the initial samples showed very interesting catalytic properties in terms of isomerization reactions of alkanes. This catalytic activity was attributed to the MoO 2 phase on the surface, which had both metallic and acidic functions (bifunctional mechanism). In addition, inelastic mean free paths in MoO 2 catalyst were measured experimentally by elastic peak electron spectroscopy (EPES). Copyright © 2002 John Wiley & Sons, Ltd.