TY - JOUR
T1 - Enhancement of pyrolysis gasoline hydrogenation over Pd-promoted Ni/SiO2-Al2O3 catalysts
AU - Castaño, P.
AU - Pawelec, B.
AU - Fierro, J. L.G.
AU - Arandes, J. M.
AU - Bilbao, J.
N1 - Generated from Scopus record by KAUST IRTS on 2019-08-08
PY - 2007/10/1
Y1 - 2007/10/1
N2 - Pyrolysis gasoline upgrading by hydrogenation and ring opening was investigated over highly loaded Ni catalysts supported on amorphous silica-alumina and incorporating promoters as Pd, seeking a higher aromatic reduction of this feedstock in order to meet stringent fuel regulations. The effect of Ni loading and Pd component on the activity of those systems was evaluated in a fixed bed reactor under the following operating conditions: T = 573 and 673 K, H2:PyGas molar ratio = 10, P = 5.0 MPa, WHSV = 4 h-1. The catalyst properties, measured by several characterization techniques (ICP-AES, XRD, N2 adsorption-desorption isotherms, TPR, H2-TPD, CO chemisorption, XPS, FTIR spectroscopy of adsorbed pyridine and NH3-TPD), were related to their catalytic activity and selectivity. Interestingly, the increase in Ni loading from 24.4 to 33.2 Ni wt.% has a negative effect on both hydrogenation and ring opening activities, as it causes a drop in the BET surface area and a decrease in metal-support interaction, with a negative bearing on catalyst stability. On the other hand, the addition of Pd has a positive effect for hydrogenation, linked with the higher electronegativity of Pd0 species compared to those of Ni0, as well as with a greater stability of Pd-promoted catalysts during on-stream conditions. A linear correlation has been found between the total amount of desorbed H2, as determined from H2-TPD experiments on freshly reduced catalysts, and the initial turnover frequency. © 2007 Elsevier Ltd. All rights reserved.
AB - Pyrolysis gasoline upgrading by hydrogenation and ring opening was investigated over highly loaded Ni catalysts supported on amorphous silica-alumina and incorporating promoters as Pd, seeking a higher aromatic reduction of this feedstock in order to meet stringent fuel regulations. The effect of Ni loading and Pd component on the activity of those systems was evaluated in a fixed bed reactor under the following operating conditions: T = 573 and 673 K, H2:PyGas molar ratio = 10, P = 5.0 MPa, WHSV = 4 h-1. The catalyst properties, measured by several characterization techniques (ICP-AES, XRD, N2 adsorption-desorption isotherms, TPR, H2-TPD, CO chemisorption, XPS, FTIR spectroscopy of adsorbed pyridine and NH3-TPD), were related to their catalytic activity and selectivity. Interestingly, the increase in Ni loading from 24.4 to 33.2 Ni wt.% has a negative effect on both hydrogenation and ring opening activities, as it causes a drop in the BET surface area and a decrease in metal-support interaction, with a negative bearing on catalyst stability. On the other hand, the addition of Pd has a positive effect for hydrogenation, linked with the higher electronegativity of Pd0 species compared to those of Ni0, as well as with a greater stability of Pd-promoted catalysts during on-stream conditions. A linear correlation has been found between the total amount of desorbed H2, as determined from H2-TPD experiments on freshly reduced catalysts, and the initial turnover frequency. © 2007 Elsevier Ltd. All rights reserved.
UR - https://linkinghub.elsevier.com/retrieve/pii/S0016236107000397
U2 - 10.1016/j.fuel.2007.01.020
DO - 10.1016/j.fuel.2007.01.020
M3 - Article
SN - 0016-2361
VL - 86
JO - Fuel
JF - Fuel
IS - 15
ER -