Research output: Contribution to journal › Article › peer-review
Comparative study of MWCNT and alumina supported CоMо hydrotreating catalysts prepared with citric acid as chelating agent. / Kazakov, M. O.; Kazakova, M. A.; Vatutina, Yu V. et al.
In: Catalysis Today, Vol. 357, 01.11.2020, p. 221-230.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Comparative study of MWCNT and alumina supported CоMо hydrotreating catalysts prepared with citric acid as chelating agent
AU - Kazakov, M. O.
AU - Kazakova, M. A.
AU - Vatutina, Yu V.
AU - Larina, T. V.
AU - Chesalov, Yu A.
AU - Gerasimov, E. Yu
AU - Prosvirin, I. P.
AU - Klimov, O. V.
AU - Noskov, A. S.
N1 - Publisher Copyright: © 2019 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/11/1
Y1 - 2020/11/1
N2 - Multi-walled carbon nanotubes (MWCNT) and alumina supported CоMо hydrotreating catalysts prepared with citric acid as a chelating agent (CoMoS/MWCNT-citr and CoMoS/Al 2 O 3 -citr respectively) were studied. MWCNT supported catalyst prepared without chelating agent (CoMoS/MWCNT) was also investigated. The addition of citric acid in MWCNT supported catalyst decreases the average slab length of MoS 2 from 4.2 to 3.0 nm without increasing the stacking, while the differences in sulfidation degree and MoS 2 promotion by cobalt are not observed. The activity of MWCNT-based catalyst in dibenzothiophene hydrodesulfurization (HDS) increases with the addition of citric acid due to improved dispersion of sulfide component. The activity in naphthalene hydrogenation does not change. The results of comparative study of MWCNT and Al 2 O 3 supported catalysts prepared with citric acid show that the catalysts have rather similar morphology of sulfide phase: average slab length of about 3 nm and average stacking number of 1.6-1.7. At the same time, in MWCNT-based catalyst, active metals are sulfided more easily and CoMoS phase is formed at higher extent due to weaker metal-support interaction. CoMoS/MWCNT and CoMoS/Al 2 O 3 -citr catalysts are both highly active in HDS and demonstrate similar conversion of dibenzothiophene. The highest HDS activity of CoMo/MWCNT-citr catalyst is attributed to the beneficial effect that is provided by the combined use of carbon support (higher sulfidation degree and higher CoMoS phase content) and citric acid (improved dispersion of sulfide component).
AB - Multi-walled carbon nanotubes (MWCNT) and alumina supported CоMо hydrotreating catalysts prepared with citric acid as a chelating agent (CoMoS/MWCNT-citr and CoMoS/Al 2 O 3 -citr respectively) were studied. MWCNT supported catalyst prepared without chelating agent (CoMoS/MWCNT) was also investigated. The addition of citric acid in MWCNT supported catalyst decreases the average slab length of MoS 2 from 4.2 to 3.0 nm without increasing the stacking, while the differences in sulfidation degree and MoS 2 promotion by cobalt are not observed. The activity of MWCNT-based catalyst in dibenzothiophene hydrodesulfurization (HDS) increases with the addition of citric acid due to improved dispersion of sulfide component. The activity in naphthalene hydrogenation does not change. The results of comparative study of MWCNT and Al 2 O 3 supported catalysts prepared with citric acid show that the catalysts have rather similar morphology of sulfide phase: average slab length of about 3 nm and average stacking number of 1.6-1.7. At the same time, in MWCNT-based catalyst, active metals are sulfided more easily and CoMoS phase is formed at higher extent due to weaker metal-support interaction. CoMoS/MWCNT and CoMoS/Al 2 O 3 -citr catalysts are both highly active in HDS and demonstrate similar conversion of dibenzothiophene. The highest HDS activity of CoMo/MWCNT-citr catalyst is attributed to the beneficial effect that is provided by the combined use of carbon support (higher sulfidation degree and higher CoMoS phase content) and citric acid (improved dispersion of sulfide component).
KW - Alumina
KW - Cobalt
KW - Hydrodesulfurization
KW - Hydrotreating
KW - Molybdenum
KW - Multi-walled carbon nanotubes
KW - HDS CATALYST
KW - MO CATALYSTS
KW - HYDRODESULFURIZATION ACTIVITY
KW - DEEP DESULFURIZATION
KW - WALLED CARBON NANOTUBES
KW - GAS OIL
KW - NANOPARTICLES
KW - PROMOTION
KW - SCIENCE-AND-TECHNOLOGY
KW - IMPREGNATION
UR - http://www.scopus.com/inward/record.url?scp=85063685263&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2019.03.051
DO - 10.1016/j.cattod.2019.03.051
M3 - Article
AN - SCOPUS:85063685263
VL - 357
SP - 221
EP - 230
JO - Catalysis Today
JF - Catalysis Today
SN - 0920-5861
ER -
ID: 19035200