ABSTRACT
Hydrocracking catalysts are dual-function catalysts. The concept of a dualfunction catalyst having two distinctly different kinds of sites was introduced by Mills et al. in 1953 [1] and later expanded by Weisz et al. [2] and Sinfeld [3,4]. These studies showed that for certain reactions (e.g., hydrocracking, hydroisomerization, dehydrocyclization) to occur, both metallic sites and acidic sites must be present on the catalyst surface.
