In this work, the impact catalyst acidity on residues hydrotreatment performances wasevaluated. NiMoP catalysts carried on multimodal alumina were used. Within thisframework, the acid properties of alumina carriers were modified in a widerange of acidity. This was achieved by doping the carriers with F and SiO2additives. Acidity was characterised by infrared spectroscopy using lutidine andpyridine as probe molecules in order to quantify Br�nsted and Lewis acid sites respectively.It was shown that fluorine allowed to develop the most enhanced Br�nstedacidity without a major impact in the active phase. A catalytic test wasperformed in a lab scale batch reactor at hydrotreatment conditions and using aSafaniya vacuum residue feedstock. Hydrotreatment functions were followed,showing that among the acidity additives that were used, fluorine enhanced mostthe asphaltenes conversion. This was attributed to the higher number of strongBr�nsted acid sites.

Effect of catalyst acidity on residues hydrotreatment

239th National Meeting (2010)

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