TY - JOUR
T1 - Palladium effect over Mo and NiMo/alumina-titania sulfided catalysts on the hydrodesulfurization of 4,6-dimethyldibenzothiophene
AU - Aguirre-Gutiérrez, A.
AU - De La Fuente, J. A.Montoya
AU - De Los Reyes, J. A.
AU - Del Angel, P.
AU - Vargas, A.
N1 - Funding Information:
Aguirre gratefully acknowledges IMP, Mexico , for providing the financial support through the Postgraduate Program.
PY - 2011/7/20
Y1 - 2011/7/20
N2 - The influence of Pd as additive for Ni and Mo catalysts supported on alumina-titania (Mo/AT) sulfided catalysts was investigated in the hydrodesulfurization of 4,6-dimethyldibenzothiophene. Pd incorporation was carried out in the oxidic phases by using sequential impregnation. The alumina-titania support was formed by anatase-TiO2 crystallites randomly dispersed on γ-Al2O3. Characterization by X-ray diffraction and Raman spectroscopy revealed that MoOx species for PdMo supported on alumina-titania displayed larger particles than those in PdNiMo catalysts. HRTEM images showed an increase in order and stacking for MoS 2 slabs after Pd addition to NiMo samples, as compared with Mo/AT. Pd incorporation over the NiMo/AT sample increased the reaction rate by 30% while no significant increase was recorded for the PdMo sample. This value corresponds to the most active catalyst and it points out to a promoting effect by Pd. This prominent hydrodesulfurization capacity for the PdNiMo/AT suggests a close interaction of Pd with NiMo. Furthermore, since Pd promoted the HDS activity for a NiMo system, the alumina-titania support played an important role.
AB - The influence of Pd as additive for Ni and Mo catalysts supported on alumina-titania (Mo/AT) sulfided catalysts was investigated in the hydrodesulfurization of 4,6-dimethyldibenzothiophene. Pd incorporation was carried out in the oxidic phases by using sequential impregnation. The alumina-titania support was formed by anatase-TiO2 crystallites randomly dispersed on γ-Al2O3. Characterization by X-ray diffraction and Raman spectroscopy revealed that MoOx species for PdMo supported on alumina-titania displayed larger particles than those in PdNiMo catalysts. HRTEM images showed an increase in order and stacking for MoS 2 slabs after Pd addition to NiMo samples, as compared with Mo/AT. Pd incorporation over the NiMo/AT sample increased the reaction rate by 30% while no significant increase was recorded for the PdMo sample. This value corresponds to the most active catalyst and it points out to a promoting effect by Pd. This prominent hydrodesulfurization capacity for the PdNiMo/AT suggests a close interaction of Pd with NiMo. Furthermore, since Pd promoted the HDS activity for a NiMo system, the alumina-titania support played an important role.
KW - 4,6-Diethyldibenzothiophene
KW - Alumina-titania
KW - Hydrodesulfurization
KW - Molybdenum sulfide
KW - Nickel sulfide
KW - Palladium
UR - http://www.scopus.com/inward/record.url?scp=80051599168&partnerID=8YFLogxK
U2 - 10.1016/j.molcata.2011.06.005
DO - 10.1016/j.molcata.2011.06.005
M3 - Artículo de revisión
SN - 1381-1169
VL - 346
SP - 12
EP - 19
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
IS - 1-2
ER -