TY - JOUR
T1 - RuS2-modified NiW/Al2O3 catalysts for refractory 4,6-dimethyl-dibenzothiophene hydrodesulfurization
AU - González-Ildelfonso, M.
AU - Escobar, J.
AU - Gordillo-Cruz, E.
AU - del Ángel, P.
AU - Suárez-Toriello, V. A.
AU - De los Reyes, J. A.
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/2/15
Y1 - 2022/2/15
N2 - Al2O3-supported noble metal (NM)-modified hydrodesulfurization (HDS) catalysts (W 15.8 wt% and Ni 3.5 wt%) were applied in refractory 4.6-dimethyl-dibenzothiophene elimination. Corresponding Ru-doped (0.5 and 0.7 wt%) materials were either dried (120 °C) or dried followed by calcining (400 °C) after NM deposition prior to activation (400 °C, 15/85H2S/H2 mixture). In solid at 0.5 wt% NM calcined after Ru deposition ruthenium was less dispersed (XRD and TPR) than over corresponding just dried one. Also, WS2 had higher dispersion (HR-TEM) on the latter. However, “NiWS” phase was enhanced (XPS) on the former material. NM-doped catalysts annealed before activation showed significantly enhanced activity (x2.4 and x1.6, solids with 0.5 and 0.7 wt% Ru, respectively) in refractory dibenzothiophene (DBT) HDS, as to that of pristine NiW/Al2O3. Enhanced hydrogenating properties of the former materials improved S elimination from sterically-hindered DBT. Conversely, Ru-doping was detrimental on NiW/alumina when non-annealed prior to activation. Unreduced Run+ and decreased pyrite-like RuS2 species (XPS) on those catalysts could be related to their strongly diminished HDS activity.
AB - Al2O3-supported noble metal (NM)-modified hydrodesulfurization (HDS) catalysts (W 15.8 wt% and Ni 3.5 wt%) were applied in refractory 4.6-dimethyl-dibenzothiophene elimination. Corresponding Ru-doped (0.5 and 0.7 wt%) materials were either dried (120 °C) or dried followed by calcining (400 °C) after NM deposition prior to activation (400 °C, 15/85H2S/H2 mixture). In solid at 0.5 wt% NM calcined after Ru deposition ruthenium was less dispersed (XRD and TPR) than over corresponding just dried one. Also, WS2 had higher dispersion (HR-TEM) on the latter. However, “NiWS” phase was enhanced (XPS) on the former material. NM-doped catalysts annealed before activation showed significantly enhanced activity (x2.4 and x1.6, solids with 0.5 and 0.7 wt% Ru, respectively) in refractory dibenzothiophene (DBT) HDS, as to that of pristine NiW/Al2O3. Enhanced hydrogenating properties of the former materials improved S elimination from sterically-hindered DBT. Conversely, Ru-doping was detrimental on NiW/alumina when non-annealed prior to activation. Unreduced Run+ and decreased pyrite-like RuS2 species (XPS) on those catalysts could be related to their strongly diminished HDS activity.
KW - 4,6-Dimethyl-dibenzothiophene
KW - Hydrogenation
KW - NiW
KW - Ruthenium sulfide
UR - http://www.scopus.com/inward/record.url?scp=85121659763&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2021.125568
DO - 10.1016/j.matchemphys.2021.125568
M3 - Artículo
AN - SCOPUS:85121659763
SN - 0254-0584
VL - 278
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 125568
ER -