Isotopic and chemical titration of acid sites in tungsten oxide domains supported on zirconia

Article Abstract:

Temporary acid sites formed by H2 dissociation and adsorption on basic oxygens in WOx domains lead to very active Bronsted acid sites, which catalyze 0-xylene isomerization with turnover rates much higher than on H-ZSM5. The surface and acid properties of WOx-ZrO2 acid catalysts were characterized in the presence of H2, and related to changes in the surface density and reducibility of WOx species.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Tungsten Compounds, Analysis, Thermal properties, Adsorption, Volumetric analysis, Chemical properties

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Structural characterization of molybdenum oxide supported on zirconia

Article Abstract:

The structure of dispersed and crystalline structures in MoO(sub x)/ZrO2 catalysts useful in the oxidative dehydrogenation of alkanes is determined by X-ray diffraction and X-ray absorption and Raman spectroscopies. The evolution of pre-edge and near edge features in the X-ray absorption spectra of these high surface density samples confirms the structural evolution observed.

Raman spectroscopy, Molybdenum oxides

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Extent of reduction of vanadium oxides during catalytic oxidation of alkanes measured by in-Situ UV-Visible spectroscopy

Article Abstract:

The method for measuring the extent of reduction during catalysis using pre-edge features in the UV-visible spectrum is described. It is proved that this method provides greater sensitivity than x-ray absorption and UV visible spectroscopic methods based on near-edge spectral features.

Ultraviolet radiation, Spectrum analysis, Spectroscopy, Electrochemistry

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