A New Class of Models to Explain the Role of Promoters in Hydrodesulfurization Catalysts.

摘要

Two models have been developed that qualitatively explain the reactivity curves for hydrodesulfurization catalysts promoted by various amounts of transition metals (e.g., MoO3-CoO). Both models, the surface complex model and the boundary model, make use of the concept of surface segregation. The ideas presented are applicable to other systems as well in that the models also explain the oxidation and isomerization activity of the MoO3-P2O5 catalyst, the dehydrogenation activity of the MoO3-Bi2O3-P2O5 catalyst, and the hydrogenation activity of the Ni-W-S catalyst as a function of bulk composition.