The hydrotreatment of heavy gas oil derived from Athabasca bitumen was studied in a trickle bed reactor over Ni-Mo, Ni-W, and Co-Mo supported on alumina catalysts at 350 °C and 4.24-12.51 MPa. The effects of temperature, pressure, and liquid flow rates on the product were investigated.ASTM distillation, cetane index, aniline point, diesel index, C/H atomic ratio, viscosities, and densities of the product were measured and correlated with various parameters. The activities of the catalysts for hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) are compared. While Ni-W/ A1203 was best for cracking, hydrogenation, and hydrodesulfurization, Ni-Mo/Al203 was best for hydrodenitrogenation. The data were fitted to a pseudo-first-order reaction model for both HDS and HDN

The hydrotreatment of heavy gas oil derived from Athabasca bitumen was studied in a trickle bed reactor over Ni-Mo supported on zeolite-alumina-silica catalyst at 623-698 K (350-425 °C), LHSV 1-4, and 6.99 MPa. The effects of temperature and liquid flow rates on the product were investigated. The activities of this catalyst for hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) are compared with a commercially available Ni-Mo on -alumina catalyst. This catalyst was able to remove as much as 99% S and 86% N present in the oil at 698 K (425 °C). Activation energies for the HDS and HDN reactions were 20.8 and 25.1 kcal/mol, respectively.Longman: London, 1978.

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Rare earth exchanged Y-type zeolite (REY-zeolite) was dispersed in a silica-alumina gel to prepare catalyst supports with better hydrogenolysis activity. Such support material showed improved hydrotreating properties compared to commercial catalysts, especially for heavy gas oils. Statistical experimental designs used to optimize the composition of such mixed supports suggested a composition of 10 wt. % silica, 25 wt. % zeolite and 65 wt. % alumina as optimum for hydrotreating a heavy gas oil (343°C to 525°C fraction) obtained from hydrocracking of Athabasca bitumen. The kinetic parameters were then evolved for the optimum catalyst, Une zeolite de type Y de terre rare (zeolite REY) a ktk dispersee dans un gel de silice-alumine pour prkparer des supports de catalyseurs avec une meilleure activite d'hydrogholyse. Ce materiau de support montre des propriCtCs d'hydrotraitement meilleures que dans le cas des catalyseurs commerciaux, particulikrement pour les gazoles lourds. Des calculs expkrimentaux statistiques utilisks pour optimiser la composition de tels supports mixtes, suggkrent une composition de 10% en poids de silice, 25% de zColite et 65% d'alumine comme optimum pour I'hydrotraitement d'un gazole lourd (fraction de 343°C B 524°C) obtenu par hydrocraquage de bitumes d'Athabasca. Les paramktres cinetiques ont ensuite CtC etablis pour le catalyseur optimal.Keywords: hydrotreating heavy gas oil, catalyst screening, mixed catalyst, hydrogenolysis rocessing of petroleum crudes and/or heavy oils always

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