Coking of Hydroprocessing Catalyst by Residue Fractions of Bitumen

摘要

The deposition of organic material, or coke, on hydroprocessing catalyst was studied using Athabasca bitumen vacuum residue (ABVB) and narrow fractions of ABVB, prepared by supercritical fluid extraction (SCFE) with n-pentane. The feed materials were diluted in a lowsulfur gas oil and hydroprocessed over a commercial NiMo/γ-Al_2O_3 catalyst ina 1 L continuousstirred tank reactor at 440 deg C. The coked catalysts were Soxhlet extracted with methylene chloride; then, carbon content, surface area, pore volume, and pore size were measured. Hydrodesulfurization activity was then measured using bitumen and dibenzothiophene as reactants.