Naphthalene hydrogenation over a NiMo/gamma-Al2O3 catalyst: Experimental study and kinetic modelling
- Author
- C. M. Cortés Romero, Joris Thybaut (UGent) and Guy Marin (UGent)
- Organization
- Abstract
- A kinetic study of the liquid phase naphthalene hydrogenation over a commercial and sulphided NiMo/gamma-Al2O3 was performed using experimental data obtained in a Robinson-Mahoney reactor at 523-583 K and 2.0-4.0 MPa. The effect of H2S on the hydrogenation rate was investigated varying its partial pressure from 0.09 to 0.89 MPa. Under these conditions, an exponential decrease in the hydrogenation rate was observed as the H2S partial pressure increased. The naphthalene conversion ranged from 6 to 89% with tetralin as the main hydrogenation product with selectivities of at least 89%. Reaction networks were formulated based on stepwise hydrogenation mechanisms assuming that both hydrogen and hydrogen sulphide could be dissociated either homolytically or heterolytically on both coordinatively unsaturated metal ion sites (CUS) and sulphur anions (SA) of the sulphided catalyst. Langmuir-Hinshel wood rate equations were derived and discriminated through model regression to experimental data. Two models best describe the experimental data according to a statistical analysis and the physical meaning of the parameter estimates. These models correspond to the third hydrogen addition chemisorbed on CUS and supplied from either homolytic or heterolytic hydrogen dissociation, as rate-determining step. The calculated catalyst surface species concentrations indicate that hydrogen and sulphydril groups are the most abundant species under the investigated operating conditions while the hydrocarbons surface concentration is almost negligible. (c) 2007 Elsevier B.V. All rights reserved.
- Keywords
- naphthalene, hydrogenation, NiMo, sulphides, hydrotreating, kinetic modelling, SULFIDE CATALYSTS, COMO/AL2O3 CATALYST, HYDRODESULFURIZATION CATALYSTS, TOLUENE HYDROGENATION, INTRINSIC KINETICS, REACTION NETWORK, MASS-TRANSFER, MOS2, H2S, NIMO/AL2O3
Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-532015
- MLA
- Cortés Romero, C. M., et al. “Naphthalene Hydrogenation over a NiMo/Gamma-Al2O3 Catalyst: Experimental Study and Kinetic Modelling.” CATALYSIS TODAY, vol. 130, no. 1, Elsevier Science, 2008, pp. 231–42, doi:10.1016/j.cattod.2007.06.074.
- APA
- Cortés Romero, C. M., Thybaut, J., & Marin, G. (2008). Naphthalene hydrogenation over a NiMo/gamma-Al2O3 catalyst: Experimental study and kinetic modelling. CATALYSIS TODAY, 130(1), 231–242. https://doi.org/10.1016/j.cattod.2007.06.074
- Chicago author-date
- Cortés Romero, C. M., Joris Thybaut, and Guy Marin. 2008. “Naphthalene Hydrogenation over a NiMo/Gamma-Al2O3 Catalyst: Experimental Study and Kinetic Modelling.” CATALYSIS TODAY 130 (1): 231–42. https://doi.org/10.1016/j.cattod.2007.06.074.
- Chicago author-date (all authors)
- Cortés Romero, C. M., Joris Thybaut, and Guy Marin. 2008. “Naphthalene Hydrogenation over a NiMo/Gamma-Al2O3 Catalyst: Experimental Study and Kinetic Modelling.” CATALYSIS TODAY 130 (1): 231–242. doi:10.1016/j.cattod.2007.06.074.
- Vancouver
- 1.Cortés Romero CM, Thybaut J, Marin G. Naphthalene hydrogenation over a NiMo/gamma-Al2O3 catalyst: Experimental study and kinetic modelling. CATALYSIS TODAY. 2008;130(1):231–42.
- IEEE
- [1]C. M. Cortés Romero, J. Thybaut, and G. Marin, “Naphthalene hydrogenation over a NiMo/gamma-Al2O3 catalyst: Experimental study and kinetic modelling,” CATALYSIS TODAY, vol. 130, no. 1, pp. 231–242, 2008.
@article{532015,
abstract = {{A kinetic study of the liquid phase naphthalene hydrogenation over a commercial and sulphided NiMo/gamma-Al2O3 was performed using experimental data obtained in a Robinson-Mahoney reactor at 523-583 K and 2.0-4.0 MPa. The effect of H2S on the hydrogenation rate was investigated varying its partial pressure from 0.09 to 0.89 MPa. Under these conditions, an exponential decrease in the hydrogenation rate was observed as the H2S partial pressure increased. The naphthalene conversion ranged from 6 to 89% with tetralin as the main hydrogenation product with selectivities of at least 89%. Reaction networks were formulated based on stepwise hydrogenation mechanisms assuming that both hydrogen and hydrogen sulphide could be dissociated either homolytically or heterolytically on both coordinatively unsaturated metal ion sites (CUS) and sulphur anions (SA) of the sulphided catalyst. Langmuir-Hinshel wood rate equations were derived and discriminated through model regression to experimental data. Two models best describe the experimental data according to a statistical analysis and the physical meaning of the parameter estimates. These models correspond to the third hydrogen addition chemisorbed on CUS and supplied from either homolytic or heterolytic hydrogen dissociation, as rate-determining step. The calculated catalyst surface species concentrations indicate that hydrogen and sulphydril groups are the most abundant species under the investigated operating conditions while the hydrocarbons surface concentration is almost negligible. (c) 2007 Elsevier B.V. All rights reserved.}},
author = {{Cortés Romero, C. M. and Thybaut, Joris and Marin, Guy}},
issn = {{0920-5861}},
journal = {{CATALYSIS TODAY}},
keywords = {{naphthalene,hydrogenation,NiMo,sulphides,hydrotreating,kinetic modelling,SULFIDE CATALYSTS,COMO/AL2O3 CATALYST,HYDRODESULFURIZATION CATALYSTS,TOLUENE HYDROGENATION,INTRINSIC KINETICS,REACTION NETWORK,MASS-TRANSFER,MOS2,H2S,NIMO/AL2O3}},
language = {{eng}},
number = {{1}},
pages = {{231--242}},
publisher = {{Elsevier Science}},
title = {{Naphthalene hydrogenation over a NiMo/gamma-Al2O3 catalyst: Experimental study and kinetic modelling}},
url = {{http://doi.org/10.1016/j.cattod.2007.06.074}},
volume = {{130}},
year = {{2008}},
}
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