Effect of the support on the high activity of the (Ni)Mo/ZrO2-SBA-15 catalyst in the simultaneous hydrodesulfurization of DBT and 4,6-DMDBT
Por:
Gutierrez, OY, Klimova, T
Publicada:
1 jul 2011
Resumen:
Series of Mo- and NiMo-catalysts were supported on ZrO2, Al2O3, SBA-15, and ZrO2-modified SBA-15 and tested in the simultaneous hydrodesulfurization (HDS) of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). The rate constants of the main steps in the HDS reaction network of both molecules were calculated, and the materials were characterized by N-2 physisorption, X-ray diffraction, UV-vis diffuse reflectance spectroscopy, temperature-programmed reduction and sulfidation, NO adsorption and high-resolution transmission electron microscopy. Tetrahedral and octahedral Mo species in the oxide precursors were related to the monolayers and multilayered MoS2 structures, respectively, in the sulfide catalysts. The morphology of the active phase and the formation of the NiMoS phase were the most important factors during the HDS process of DBT-type compounds given that the turnover frequency values did not depend on the support composition or the morphology of the active phase
Filiaciones:
Gutierrez, OY:
Univ Nacl Autonoma Mexico, Dept Ingn Quim, Fac Quim, Mexico City 04510, DF, Mexico
Klimova, T:
Univ Nacl Autonoma Mexico, Dept Ingn Quim, Fac Quim, Mexico City 04510, DF, Mexico
|