TY - JOUR
T1 - In situ reactivation of spent NiMoP/Γ-Al2O3 catalyst for hydrodesulfurization of straight-run gas oil
AU - Santolalla-Vargas, C. E.
AU - Santes, Víctor
AU - Gómez, Elizabeth
AU - Sanchez-Minero, Felipe
AU - Romero-Ibarra, Issis
AU - Goiz, O.
AU - Lartundo-Rojas, L.
AU - Díaz, Leonardo
AU - Luna-Ramirez, Rosario
AU - de los Reyes, J. A.
AU - Valdés, O. U.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/6/1
Y1 - 2019/6/1
N2 - Washing with xylene (X), 2,6 bis 1 hydroxy 1,1 diphenyl methyl pyridine (A) and in situ reactivation with molybdenum acetylacetonate (AceMo) on the NiMoP/Al2O3 spent surface catalyst has been investigated in the hydrodesulfurization (HDS) of straight-run gas oil. The spent catalyst was washed and dried at 120 °C before in situ reactivation. The sulfided catalysts were characterized by temperature programmed reduction (TPR), nuclear magnetic resonance (NMR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The HDS reactions were carried out at 5.5 MPa of H2 and the reaction temperatures at 340 °C, 360 °C and 380 °C. The CatAXAceMo displayed the highest HDS activity. The TPR results advice that CatAX presented more “rigid” MoS2 edges than CatRef catalyst. NMR results suggest that CatAXAceMo showed lower aromatic or polyaromatic hydrocarbons surface concentration deposited after HDS reaction than CatAceMo and CatRef. Raman spectroscopy revealed the formation of coke crystallites with shorter size for CatAXAceMo than others catalysts. XPS spectroscopy results exhibited that CatAXAceMo presented smaller superficial carbon and a larger concentration of MoS2 active phase. A relation between the coke crystallites size and MoS2 superficial concentration was found. A lower aromatic concentration favors the shorter coke crystallites sizes and a major availability of Mo species for the formation of MoS2 to HDS reaction.
AB - Washing with xylene (X), 2,6 bis 1 hydroxy 1,1 diphenyl methyl pyridine (A) and in situ reactivation with molybdenum acetylacetonate (AceMo) on the NiMoP/Al2O3 spent surface catalyst has been investigated in the hydrodesulfurization (HDS) of straight-run gas oil. The spent catalyst was washed and dried at 120 °C before in situ reactivation. The sulfided catalysts were characterized by temperature programmed reduction (TPR), nuclear magnetic resonance (NMR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The HDS reactions were carried out at 5.5 MPa of H2 and the reaction temperatures at 340 °C, 360 °C and 380 °C. The CatAXAceMo displayed the highest HDS activity. The TPR results advice that CatAX presented more “rigid” MoS2 edges than CatRef catalyst. NMR results suggest that CatAXAceMo showed lower aromatic or polyaromatic hydrocarbons surface concentration deposited after HDS reaction than CatAceMo and CatRef. Raman spectroscopy revealed the formation of coke crystallites with shorter size for CatAXAceMo than others catalysts. XPS spectroscopy results exhibited that CatAXAceMo presented smaller superficial carbon and a larger concentration of MoS2 active phase. A relation between the coke crystallites size and MoS2 superficial concentration was found. A lower aromatic concentration favors the shorter coke crystallites sizes and a major availability of Mo species for the formation of MoS2 to HDS reaction.
KW - Coke
KW - Hydrodesulfurization
KW - Nickel-molybdenum
KW - Spent catalyst
KW - Straight run gas-oil
UR - http://www.scopus.com/inward/record.url?scp=85062911644&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2019.03.015
DO - 10.1016/j.cattod.2019.03.015
M3 - Artículo
AN - SCOPUS:85062911644
SN - 0920-5861
VL - 329
SP - 44
EP - 52
JO - Catalysis Today
JF - Catalysis Today
ER -