III International Conference

PP-III-98EFFECT OF PREPARATION METHOD AND TiO 2 CONTENT ON THE NATUREOF NICKEL OXIDE SPECIES IN Ni/SiO 2 TiO 2 CATALYSTSGrzechowiak J.R., Szyszka I., Masalska A.Division of Chemistry and Technology of Fuels, Wrocław University of Technology, 50-344Wrocław, ul. Gdańska 7/9, PolandE-mail:Jolanta.Grzechowiak@pwr.wroc.plRecent environmental legislation on diesel fuels focuses on sulphur content, polynucleararomatics (PNA), and cetane number (CN). CN improvement needs deep hydrogenation ofaromatics. Aromatic hydrogenation is necessary for selective ring opening as an additionalstep in diesel fuel upgrading. Intensive research efforts have been conducted in recent years inorder to develop catalysts and process for aromatic hydrogenation [1, 2]. The TiO 2 containingmixed oxides were regarded as very promising supports of catalysts [3]. A number of studieshave been devoted to NiMo/Al 2 O 3 TiO 2 HDS catalysts [4].The present work tries to understand the effect of TiO 2 (10, 25 and 50 wt. %) content onthe nature of oxide nickel phases supported on Si-Ti binary oxides prepared by deposition ofTiO 2 on the silica surface via hydrolysis of titanium precursors (Method A and D) and by solgelone step hydrolysis (Method E). Catalysts containing 5 wt.% of the nickel werecharacterized using ICP, TPR, TPO, XRD and SEM methods. Properties of the supports aregiven in Table 1.Table 1. Results of N 2 adsorption and NH 3 chemisorption of supports (extruded and calcinedat 450 °C).TiO 2 content, wt.%/preparation methodComposition S, m 2 /g V, cm 3 /g r, nma, mmol NH 3 /g10/A 434.3 0.15 1.22 0.14925/A 464.5 0.21 1.90 0.32250/A 501.0 0.29 1.61 0.39710/D 64.8 0.14 0.48 0.07925/D SiO 2 -TiO 2 338.3 0.55 3.30 0.10350/D 275.2 0.62 4.54 0.09110/E 85.5 0.09 2.03 0.29725/E 338.3 0.56 5.40 0.63450/E245.4 0.10 1.32 0.665650