TY - JOUR
T1 - Role of Pt-Pd/γ-Al2O3 on the HDS of 4,6-DMBT
T2 - Kinetic modeling & contribution analysis
AU - Castillo-Araiza, C. O.
AU - Chávez, G.
AU - Dutta, A.
AU - De Los Reyes, J. A.
AU - Nuñez, S.
AU - García-Martínez, J. C.
N1 - Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.
PY - 2015/4
Y1 - 2015/4
N2 - The purpose of this study is to provide insights on the function of noble metals, namely Pt-Pd catalytic system, on the hydrodesulfurization (HDS) of alkyl-substituted dibenzothiophenes (a-DBTs) by means of kinetic modeling and contribution analyses. A series of Pt-Pd systems (1% wt. nominal loading) supported on γ-Al2O3 (0-100, 20-80, 50-50, 80-20 and 100-0; %mol Pt-%mol Pd) are synthesized and evaluated during the HDS of 4,6-dimethyldibenzothiophene (4,6-DMDBT) at operating conditions relevant for industry: 320 °C, 500 ppm of S and an H2 pressure of 5.5 MPa. A summary of their characterization is presented as reference herein. Kinetic model based on a Langmuir-Hinshelwood-Hougen-Watson (LHHW) mechanism and contribution analysis based on predicted reaction rates give rise to the following findings: the bimetallic catalyst 8Pt-2Pd/γ-Al2O3 (80-20; %mol Pt-%mol Pd) leads to the highest activity; in all Pt-Pd/γ-Al2O3 systems, Pt favors desulfurization reactions, i.e., 4,6-DMDBT to 3,3′-dimethylphenyl (3,3′-DMBP) and 4,6-dimethyltetrahydrodibenzothiophene (4,6-DM-th-DBT) to MCHT, whereas Pd favors hydrogenation of 4,6-DMDBT to 4,6-DM-th-DBT; and 4,6-DMDBT and methylcyclohexyltoluene (MCHT) are the hydrocarbons with the lowest and highest affinity to be adsorbed on the active sites from the studied Pt-Pd/γ-Al2O3 systems, respectively.
AB - The purpose of this study is to provide insights on the function of noble metals, namely Pt-Pd catalytic system, on the hydrodesulfurization (HDS) of alkyl-substituted dibenzothiophenes (a-DBTs) by means of kinetic modeling and contribution analyses. A series of Pt-Pd systems (1% wt. nominal loading) supported on γ-Al2O3 (0-100, 20-80, 50-50, 80-20 and 100-0; %mol Pt-%mol Pd) are synthesized and evaluated during the HDS of 4,6-dimethyldibenzothiophene (4,6-DMDBT) at operating conditions relevant for industry: 320 °C, 500 ppm of S and an H2 pressure of 5.5 MPa. A summary of their characterization is presented as reference herein. Kinetic model based on a Langmuir-Hinshelwood-Hougen-Watson (LHHW) mechanism and contribution analysis based on predicted reaction rates give rise to the following findings: the bimetallic catalyst 8Pt-2Pd/γ-Al2O3 (80-20; %mol Pt-%mol Pd) leads to the highest activity; in all Pt-Pd/γ-Al2O3 systems, Pt favors desulfurization reactions, i.e., 4,6-DMDBT to 3,3′-dimethylphenyl (3,3′-DMBP) and 4,6-dimethyltetrahydrodibenzothiophene (4,6-DM-th-DBT) to MCHT, whereas Pd favors hydrogenation of 4,6-DMDBT to 4,6-DM-th-DBT; and 4,6-DMDBT and methylcyclohexyltoluene (MCHT) are the hydrocarbons with the lowest and highest affinity to be adsorbed on the active sites from the studied Pt-Pd/γ-Al2O3 systems, respectively.
KW - Contribution analysis
KW - Desulfurization
KW - Hydrogenation
KW - Kinetic modeling
KW - LHHW
KW - Pt-Pd/γ-AlO
UR - http://www.scopus.com/inward/record.url?scp=84922256101&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2014.12.028
DO - 10.1016/j.fuproc.2014.12.028
M3 - Artículo
SN - 0378-3820
VL - 132
SP - 164
EP - 172
JO - Fuel Processing Technology
JF - Fuel Processing Technology
ER -