Toward a better understanding of residue hydroconversion catalysts using NiMo catalysts supported over silica grafted Al2O3

摘要: Abstract The aim of this work was to investigate the influence catalyst acidity in vacuum residues hydroconversion processes. To achieve goal, a grafting procedure applied order incorporate silicon at surface alumina carriers. corresponding NiMoP catalysts with different amounts support were evaluated assess conversion rate and mechanism Safaniya residue batch reactor 370 °C. A multi-techniques set analyses used, characterize both sulphided active phase (TEM, XPS, IR-CO, model molecules test) (IR-CO, tests). We also confirm that texture not modified by incorporation silicon. Grafting allows control textures but hydrogenation rate, one being assessed toluene hydrogenation. In addition, strength slightly increased. Nevertheless, it remains obvious nickel disponibility (i.e. catalyst) must be affected higher concentration It leads significant modifications features. As matter fact, same texture, hydrogenating power, level reveal no change ( χ 370+ 540+ HDAsC7) or performance (HDS, HDV). is proved can enhance cracking aliphatic chains asphaltenes without increasing their aromaticity. could provide an original way from well known thermal mechanisms. This new transformation opens complete reactivity over whole HDT