Journal
CATALYSIS TODAY
Volume 305, Issue -, Pages 152-161Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2017.08.009
Keywords
Deep hydrodesulphurization; SBA-15; DBT; NiMoW catalysts
Funding
- CONACyT program (Mexico) [182191, 117373]
- CICUMSNH programs (Mexico)
- Madrid Regional Research Council (CAM) [S2013/MAE-2882]
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This work studies the effect of the support modifications (SBA-15) with Ti by using a ternary system as an active phase (Ni, Mo, W). Calcined and sulfided catalysts were characterized by a variety of techniques such as XRD, S-BET, TPR, TPD-NH3, DRS-UV-vis, micro-Raman spectroscopy and HRTEM. Sulfided catalysts were tested in the hydrodesulphurization (HDS) of dibenzothiophene (DBT) performed in a batch reactor at 320 degrees C and total hydrogen pressure of 800 psi. This reaction was selected for the catalyst screening because DBT is a typical sulfur-containing hydrocarbon present in high-boiling petroleum fractions and coal derived liquids and the absence of any diffusion limitation for DBT molecule to entry into the porous structure of the SBA-15 supported catalysts. We observed that the incorporation of Ti did not decrease the catalytic activity in the HDS of DBT reaction except for Si/Ti = 40 catalyst. UV-vis analyses show a higher amount of tetrahedral species for CAT/40TiS15 in counterpart with CAT/60TiS15 that showed a lower amount of those species however, the lower amount of Ti in the catalyst (CAT/60TiS15) showed the highest hydrogenation capability among the catalysts studied (HYD/DDS = 0.81) despite the main route in the HDS of DBT reaction was the direct desulfurization (DDS) pathway (selectivity).
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