TY - JOUR
T1 - Effect of ethyleneglycol addition on the properties of P-doped NiMo/Al2O3 HDS catalysts
T2 - Part I. Materials preparation and characterization
AU - Escobar, José
AU - Barrera, María C.
AU - Toledo, José A.
AU - Cortés-Jácome, María A.
AU - Angeles-Chávez, Carlos
AU - Núñez, Sara
AU - Santes, Víctor
AU - Gómez, Elizabeth
AU - Díaz, Leonardo
AU - Romero, Eduardo
AU - Pacheco, José G.
N1 - Funding Information:
The authors appreciate financial support from Instituto Mexicano del Petróleo (R&D Project D.00446). M.C. Barrera also acknowledges Instituto Mexicano del Petróleo (88404), CONACYT (88474, Mexico) and ICyT for a Post Doctoral fellow grant.
PY - 2009/5/20
Y1 - 2009/5/20
N2 - Phosphorous-doped NiMo/Al2O3 hydrodesulfurization (HDS) catalysts (nominal Mo, Ni and P loadings of 12, 3, and 1.6 wt%, respectively) were prepared using ethyleneglycol (EG) as additive. The organic agent was diluted in aqueous impregnating solutions obtained by MoO3 digestion in presence of H3PO4, followed by 2NiCO3·3Ni(OH)2·4H2O addition. EG/Ni molar ratio was varied (1, 2.5 and 7) to determine the influence of this parameter on the surface and structural properties of synthesized materials. As determined by temperature-programmed reduction, ethyleneglycol addition during impregnation resulted in decreased interaction between deposited phases (Mo and Ni) and the alumina carrier. Dispersion and sulfidability (as observed by X-ray photoelectron microscopy) of molybdenum and nickel showed opposite trends when incremental amounts of the organic were added during catalysts preparation. Meanwhile Mo sulfidation was progressively decreased by augmenting EG concentration in the impregnating solution, more dispersed sulfidic nickel was evidenced in materials synthesized at higher EG/Ni ratios. Also, enhanced formation of the so-called "NiMoS phase" was registered by increasing the amount of added ethyleneglycol during simultaneous Ni-Mo-P-EG deposition over the alumina carrier. That fact was reflected in enhanced activity in liquid-phase dibenzothiophene HDS (batch reactor, T = 320 °C, P = 70 kg/cm2) and straight-run gas oil desulfurization (steady-state flow reactor), the latter test carried out at conditions similar to those used in industrial hydrotreaters for the production of ultra-low sulfur diesel (T = 350 °C, P = 70 kg/cm2, LHSV = 1.5 h-1 and H2/oil = 2500 ft3/bbl).
AB - Phosphorous-doped NiMo/Al2O3 hydrodesulfurization (HDS) catalysts (nominal Mo, Ni and P loadings of 12, 3, and 1.6 wt%, respectively) were prepared using ethyleneglycol (EG) as additive. The organic agent was diluted in aqueous impregnating solutions obtained by MoO3 digestion in presence of H3PO4, followed by 2NiCO3·3Ni(OH)2·4H2O addition. EG/Ni molar ratio was varied (1, 2.5 and 7) to determine the influence of this parameter on the surface and structural properties of synthesized materials. As determined by temperature-programmed reduction, ethyleneglycol addition during impregnation resulted in decreased interaction between deposited phases (Mo and Ni) and the alumina carrier. Dispersion and sulfidability (as observed by X-ray photoelectron microscopy) of molybdenum and nickel showed opposite trends when incremental amounts of the organic were added during catalysts preparation. Meanwhile Mo sulfidation was progressively decreased by augmenting EG concentration in the impregnating solution, more dispersed sulfidic nickel was evidenced in materials synthesized at higher EG/Ni ratios. Also, enhanced formation of the so-called "NiMoS phase" was registered by increasing the amount of added ethyleneglycol during simultaneous Ni-Mo-P-EG deposition over the alumina carrier. That fact was reflected in enhanced activity in liquid-phase dibenzothiophene HDS (batch reactor, T = 320 °C, P = 70 kg/cm2) and straight-run gas oil desulfurization (steady-state flow reactor), the latter test carried out at conditions similar to those used in industrial hydrotreaters for the production of ultra-low sulfur diesel (T = 350 °C, P = 70 kg/cm2, LHSV = 1.5 h-1 and H2/oil = 2500 ft3/bbl).
KW - Ethyleneglycol
KW - Hydrodesulfurization
KW - NiMo/AlO catalyst
KW - NiMoS phase
KW - Phosphomolybdates
KW - ULSD
UR - http://www.scopus.com/inward/record.url?scp=65549143832&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2008.10.005
DO - 10.1016/j.apcatb.2008.10.005
M3 - Artículo
SN - 0926-3373
VL - 88
SP - 564
EP - 575
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
IS - 3-4
ER -