SBA-15 supports modified by Ti and Zr grafting for NiMo hydrodesulfurization catalysts

• Published in: Catalysis today Vol. 116; no. 4; pp. 485 - 497
• Main Authors: Gutiérrez, Oliver Y., Fuentes, Gustavo A., Salcedo, Cecilia, Klimova, Tatiana
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.09.2006; Elsevier Science
• Subjects: 4,6-Dimethyldibenzothiophene; Catalysis; Chemical grafting; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Hydrodesulfurization; Mesoporous molecular sieves; NiMo catalysts; Porous materials; SBA-15; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Titania; Zirconia; Zirconia; NiMo catalysts; Mesoporous molecular sieves; 4,6-Dimethyldibenzothiophene; Titania; SBA-15; Chemical grafting; Hydrodesulfurization; Mixed catalyst; Support; Transition element compounds; Transition metal; Grafting; Porous material; Molybdenum; Mesoporosity; Molecular sieve; Heterogeneous catalysis; Nickel; Titanium oxide; Catalyst
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2006.06.035

A series of Ti- and Zr-containing mesoporous SBA-15 supports and their respective NiMo catalysts were prepared to study the effect of the Ti and Zr loading into the support on the characteristics of Ni and Mo surface species and their catalytic activity in the 4,6-dimethyldibenzothiophene hydrodesulfurization (HDS). Ti and Zr-containing SBA-15 solids with different metal loading (up to 19 wt.% of TiO 2 or 22 wt.% of ZrO 2) were prepared by chemical grafting. The solids prepared were characterized by N 2 physisorption, X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (DRS), temperature-programmed reduction (TPR), chemical analysis and HRTEM. The results show that Ti- and Zr-SBA-15 supports with highly dispersed Ti and Zr species can be obtained without substantial loss of SBA-15 characteristics. Zr grafted species showed somewhat better dispersion on the SBA-15 surface than the corresponding Ti counterparts. It was found that TiO 2 and, especially, ZrO 2 incorporation in the SBA-15 support leads to stronger interaction of Mo and Ni species with the support providing better dispersion to the oxidic and sulfided metal species (XRD, TPR, HRTEM). NiMo catalysts supported on Ti- and Zr-containing SBA-15 showed high activity in 4,6-dimethyldibenzothiophene HDS. It can be concluded therefore that SBA-15 materials grafted with Ti or Zr species show promising features as supports for Mo-based hydrotreating catalysts.