ESCA And SIMS-ISS Characterization of Cobalt Promoted Molybdena Catalysts. Final Technical Report

摘要

The catalysts used most frequently for hydrodesulfurization is a molybdenum supported on gamma -Al sub 2 O sub 3 catalyst with Co or Ni present as a promoter. Although much research has been aimed at understanding these catalytic systems, the literature reveals contradictions of results and interpretations. Many factors account for this present state of affairs, particularly the method of catalyst preparation. Hence, it is not always legitimate to interpret data based on the results of other workers. In this vein, application of a wide variety of techniques to characterization of a single catalyst series is desirable. This report describes chemical preparation, reduction and sulfidation of cobalt promoted molybdena catalysts. The catalysts were then characterized by a variety of techniques. All ESCA spectra showing binding energies of catalysts were taken on an AEI ES 200A electron spectrometer interfaced to an AEI DS100 data system. ISS analysis was performed on a 3M model 525 spectrometer. An in-house photoacoustic spectrometer at the University of Denver was used to obtain PAS spectra. Results are discussed. 22 refs., 12 figs., 4 tabs. (ERA citation 10:025877)