Abstract
Publisher Summary This chapter discusses the method of preparation and structure of hydrodesulfurization (HDS) catalysts of the Co(Ni)/Mo(W)-y-Al2O3 type. The focus of the chapter is on the function of the support in the catalysts precursory oxidic state and sulfidic state present during actual operation. Three models have been proposed for the structure of HDS catalysts with the general composition Co(Ni) /Mo(W)-y-Al2O3: (1) monolayer model, (2) (pseudo) intercalation model, and (3) synergetic model. Any support with a high specific surface area is, in principle, acceptable for HDS catalyst systems. Alumina is commonly preferred, because it inhibits the formation of CoMoO4 (a precursor of compounds such as CoMo2S4 with low HDS activities) and thus exerts a beneficial influence on catalyst preparation. Alumina may also differ from other support in preserving, at the surface, specific hydrogenation sites, which are very probably not susceptible to sulfur poisoning. Application of supports with strong hydrocracking functions may lead to the formation of bifunctional catalysts particularly suitable for the hydrocracking of oil fractions or perhaps even coal.
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