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Distribution of molybdenum oxidation states in reduced Mo/TiO sub 2 catalysts: Correlation with benzene hydrogenation activity

Journal Article · · Journal of Physical Chemistry; (USA)
DOI:https://doi.org/10.1021/j100367a058· OSTI ID:6668239
; ; ;  [1]
  1. Univ. of Pittsburgh, PA (USA)
+ Show Author Affiliations

A 5 wt % MoO{sub 3}/TiO{sub 2} catalyst was reduced in hydrogen at various temperatures to produce a surface with average Mo oxidation states between +6 and 0. The changes in molybdenum oxidation states as a function of the extent of reduction were monitored by gravimetric analyses and x-ray photoelectron spectroscopy (XPS, ESCA), and the results were correlated with benzene hydrogenation activity. ESCA Mo 3d{sub 5/2} binding energy values for the various Mo oxidation states on a 5 wt % MoO{sub 3}/TiO{sub 2} catalyst show a shift of 5.1 eV between Mo{sup +6} (232.7 eV) and Mo{sup 0} (227.6 eV). The benzene hydrogenation activity was found to depend strongly on the extent of reduction of the Mo phase. Comparison of benzene hydrogenation activity with the distribution of Mo oxidation states determined by ESCA suggests that molybdenum ions with an oxidation state of +2 are the most active species.

OSTI ID:
6668239
Journal Information:
Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:4; ISSN 0022-3654; ISSN JPCHA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400200 -- Inorganic
Organic
& Physical Chemistry
AROMATICS
BENZENE
CALCULATION METHODS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGENATION
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
MOLYBDENUM
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS