A Comparison study of NiW and NiPW hydrodesulfurization catalysts supported on SBA-15 and alumina

摘要

A series of Ni-promoted W HDS catalysts supported on SBA-15 or γ-alumina was prepared using two different active phase precursors, Keggin-type heteropolyacid, H3PW_(12)O_(40) (HPW), and ammonium metatungstate. Prepared catalysts were characterized by N2 physisorption, small- and wide-angle XRD, UV-Vis DRS, FT-IR, TPR, ~(31)P MAS-NMR, HRTEM and evaluated in hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT). It was found that Keggin structure is preserved in the oxide precursor supported on SBA-15, whereas it is partially destroyed on γ-Al2O3 due to the strong interaction of parent HPW with this support. The catalysts supported on SBA-15 showed better catalytic performance than those supported on γ-alumina and the use of heteropolyacid precursor resulted in a further increase in catalytic activity. NiPW/SBA-15 catalyst showed the highest activity in 4,6-DMDBT HDS and an enhancement of the HYD route, which were attributed to the good dispersion and the appropriate morphology of the WS2 active phase.