III International Conference

PP-II-33Fig. 1. Influence of the additive ofvanadium on activity of Al-Ni-Mocatalysts modified with tungstenFig. 2. Influence of the additive of vanadiumon activity of Al-Co-Mo catalyst containingSiMo 12 -HPA and SiW 12 -HPAThe complex of modifying additives in the best way is proved in case of use cobalt aspromoter. The data submitted in fig. 2 show, that the additive of vanadium to Al-Co-Mocatalyst containing SiMo 12 -HPA and SiW 12 -HPA, essentially raises its HDS activity.In fig. 3 influence of the additive of tungsten on HDS degree for Al-Ni-Mo catalystsmodified with vanadium is shown. The sample 13 does not contain any tungsten; thesample 10 is modified with tungsten (WO 3 is introduced from PTA).Fig. 3. Influence of the additive of tungsten onHDS activity of catalysts modified withvanadiumFrom fig. 3 it is visible, that introduction in catalytic composition of tungsten essentiallyincreases HDS activity at low temperatures (at 320 o C by 10.6 rel %), but at highertemperatures influence of tungsten is insignificant.It is established, that joint application of vanadium and HPA allows increasing of activityof the catalyst in a wide interval of temperatures.224