Title: Effect of Chlorine, Fluorine and Titania on Surface Structure and HydroprocessingActivity of NiMo/Al2O3 Catalysts Supported on Alumina

摘要

In this work, three catalysts namely NiMo/Al2O3-12 wt% Cl, NiMo/Al2O3-4 wt% F andrnNiMo/Al2O3-6 wt% Ti were prepared. All modified supports and fresh catalysts wererncharacterized by BET surface area, pore volume and pore diameter, XRD, TPR, TPD, XPS,rnand XANES techniques. Addition of chlorine and fluorine formed weak-intermediate acidcentersrnon the catalyst surface whereas titania formed weak-intermediate-strong acid-centers.rnAlso, these elements increased the formation of polymolydenum oxide on the catalyst asrnevident from TPR and XPS analysis. XANES analysis showed that incorporation of chlorine,rnfluorine and titania increased the formation of molybdenum oxide on the catalyst. The initialrnactivity of these catalysts were tested in a trickle-bed reactor using three different gas oilsrnsuch as light gas oil (LGO), blended gas oil (Blended: 50% LGO and 50% HGO) and heavyrngas oil (HGO), all derived from Athabasca bitumen. This research showed that the optimumrncatalysts (containing 12 wt% chlorine or 6 wt% titania on Al2O3) removed over 86 wt% nitrogenrncompounds from blended feed which was higher than that from commercial catalyst. However,rnaddition of additives in alumina had very little effect on sulfur conversion of blended and HGO.