Abstract
TiO 2-Al 2O 3 binary oxide supports were obtained by sol–gel methods from Tetra- n-butyl-titanate and pseudoboehmite/aluminium chloride resources. The typical physico-chemical properties of NiW/TiO 2-Al 2O 3 catalysts with different TiO 2 loadings and their supports were characterized by means of BET, XRD and UV–vis DRS, etc. The BET results indicated that the specific surface areas of NiW/TiO 2-Al 2O 3 catalysts were as higher as that over pure γ-Al 2O 3 support, and the pore diameters were also large. The XRD and UV–vis DRS analyzing results showed that the Ti-containing supported catalysts existed as anatase TiO 2 species and the incorporation of TiO 2 could adjust the interaction between support and active metal, and impelled the higher reducibility of tungsten. The hydrodesulphurization (HDS) performance of the series catalysts were evaluated with diesel feedstock in a micro-reactor unit, and the HDS results showed that NiW/TiO 2-Al 2O 3 catalysts exhibited higher activities of ultra deep hydrodesulphurization of diesel oil than that of NiW/Al 2O 3 catalyst. The optimal TiO 2 content of NiW/TiO 2-Al 2O 3 catalysts was about 15 m%, and the corresponding HDS efficiency could reach to 100%. The sulphur contents of diesel products over NiW/TiO 2-Al 2O 3 (from pseudoboehmite/AlCl 3) catalysts with suitable TiO 2 content could be less than 15 ppmw, which met the sulphur regulation of Euro IV specification of ultra clean diesel fuel.
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