Abstract
Static SIMS was used to characterize SiO 2- and Al 2O 3-supported molybdena catalysts. Changes in dispersion following calcination and water exposure treatments previously observed by UV, ESCA, ISS, and Raman spectroscopies for Mo SiO 2 were confirmed by the SIMS data. As such dispersion changes were not found by SIMS with Mo Al 2O 3 catalysts, additional ESCA and UV spectra were recorded for these catalysts after calcination/water vapor exposures cycles. These data essentially confirm the absence of any change in dispersion on Mo coordination. Analysis of both Mo SiO 2 and Mo Al 2O 3 catalysts illustrate the sensitivity of the static SIMS technique to structural changes in supported molybdena phases.
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