Written by a scientist and researcher with more than 25 years of experience in the field, this serves as a complete guide to catalyst activity loss during the hydroprocessing of heavy oils. * Explores the physical and chemical properties of heavy oils and hydroprocessing catalysts; the mechanisms of catalyst deactivation; catalyst characterization by a variety of techniques and reaction conditions; laboratory and commercial information for model validations; and more * Demonstrates how to develop correlations and models for a variety of reaction scales with step-by-step descriptions and detailed experimental data * Contains important implications for increasing operational efficiencies within the petroleum industry * An essential reference for professionals and researchers working in the refining industry as well as students taking courses on chemical reaction engineering