Kinetics of Bitumen‐Derived Gas Oil Upgrading Using a Commercial NiMo/Al2O3 Catalyst

Hydrotreating (HT) kinetics of Athabasca bitumen-derived gas oil has been studied between 340 to 420°C using a commercial NiMo/γ-Al2O3 catalyst. The kinetics analyses included overall conversion of high-boiling species into low-boiling products, hydrodenitrogenation (HDN) of total, basic and non-basic nitrogen compounds and hydrodesulfurization (HDS). Three temperature regimes were marked out for the kinetic analyses: low (340-370°C), intermediate (370-400°C) and high (400-420°C). The mechanism for the conversion of high to low-boiling species was observed to change from one temperature regime to the other, giving rise to different activation energies. HDS and HDN activation energies increased in the order: high < low < intermediate severity temperature regime. On a etudie la cinetique de l'hydrotraitement (HT) du gazole d'Athabasca entre 340 et 420 °C a l'aide d'un catalyseur commercial de NiMo/γ-Al2O3. Les analyses cinetiques comprennent la conversion globale des especes a point d'ebullition eleve en produits ayant des points d'ebullition bas, l'hydrodenitrogenation (HDN) de tous les composes azotes basiques et non basiques et l'hydrodesulfuration (HDS). Trois regimes de temperatures ont ete distingues pour les analyses cinetiques: faible (340-370°C), intermediaire (370-400°C) et eleve (400-420°C). On a remarque que le mecanisme de conversion des especes a point d'ebullition eleve en produits a point d'ebullition bas changeait d'un regime de temperatures a l'autre, entrainant l'augmentation des differentes energies d'activation. Les energies d'activation de l'HDS et HDN augmentent dans l'ordre: eleve < faible < regime de temperatures de severite intermediaire

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