TY - JOUR
T1 - HDS, HDN and HDA activities of nickel-molybdenum catalysts supported on alumina
AU - Domínguez-Crespo, M. A.
AU - Torres-Huerta, A. M.
AU - Díaz-García, L.
AU - Arce-Estrada, E. M.
AU - Ramírez-Meneses, E.
N1 - Funding Information:
The authors wish to thank the financial support given by: Instituto Mexicano del Petróleo (IMP), SIP-IPN 20071120, 20072176 projects and SNI-CONACYT.
PY - 2008/8
Y1 - 2008/8
N2 - In this work, NiMo-Al2O3 catalysts were prepared by using different alumina precursors. The supports were impregnated by means of the spray at incipient wetness technique in both basic and acid media. Both the supports and fresh catalysts were characterized by the adsorption-desorption isotherms, Temperature-Programmed Reduction (TPR), Thermal Pyridine Adsorption-Desorption (TPD) and X-Ray Diffraction analyses (XRD). After sulfidation, the NiMoS metallic particles were characterized by Transmission Electron Microscopy (TEM). The initial analyses were performed in a trickle-bed reactor by using a real feedstock (Mexican heavy gas oil) and performing hydrotreating reactions (HDS, HDN and HDA) at three different temperatures: 613, 633 and 653 K; and 54 kg cm- 2. The catalytic activities are discussed in relation to the physicochemical properties of the NiMo catalysts, alumina phase and pH of the impregnating solution. The catalytic results show an increase in the conversion profiles with temperature. The sulfur conversion was increased from 89 to 99.25%, 91-99%, 90.8-97%, 83-95% and 78-96% when the crystal size of the support varied from 3 to 20 nm, respectively. The nitrogen and aromatic conversions were also increased in the range of 23-45 wt.%. It was found that the γ phase reached a higher catalytic performance than the η phase. The NiMo catalysts synthesized in a basic medium showed a better catalytic performance than that obtained with those prepared in acid solutions. The significance of the kinetic data to compare the catalysts is discussed. The maximum value of the catalytic activity was reached with the catalysts with the smallest particle sizes.
AB - In this work, NiMo-Al2O3 catalysts were prepared by using different alumina precursors. The supports were impregnated by means of the spray at incipient wetness technique in both basic and acid media. Both the supports and fresh catalysts were characterized by the adsorption-desorption isotherms, Temperature-Programmed Reduction (TPR), Thermal Pyridine Adsorption-Desorption (TPD) and X-Ray Diffraction analyses (XRD). After sulfidation, the NiMoS metallic particles were characterized by Transmission Electron Microscopy (TEM). The initial analyses were performed in a trickle-bed reactor by using a real feedstock (Mexican heavy gas oil) and performing hydrotreating reactions (HDS, HDN and HDA) at three different temperatures: 613, 633 and 653 K; and 54 kg cm- 2. The catalytic activities are discussed in relation to the physicochemical properties of the NiMo catalysts, alumina phase and pH of the impregnating solution. The catalytic results show an increase in the conversion profiles with temperature. The sulfur conversion was increased from 89 to 99.25%, 91-99%, 90.8-97%, 83-95% and 78-96% when the crystal size of the support varied from 3 to 20 nm, respectively. The nitrogen and aromatic conversions were also increased in the range of 23-45 wt.%. It was found that the γ phase reached a higher catalytic performance than the η phase. The NiMo catalysts synthesized in a basic medium showed a better catalytic performance than that obtained with those prepared in acid solutions. The significance of the kinetic data to compare the catalysts is discussed. The maximum value of the catalytic activity was reached with the catalysts with the smallest particle sizes.
KW - Catalysis
KW - Heavy gas oil
KW - Hydrotreating
KW - NiMoS particles
UR - http://www.scopus.com/inward/record.url?scp=47749126598&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2008.01.004
DO - 10.1016/j.fuproc.2008.01.004
M3 - Artículo
SN - 0378-3820
VL - 89
SP - 788
EP - 796
JO - Fuel Processing Technology
JF - Fuel Processing Technology
IS - 8
ER -