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Title: A fundamental kinetic model for hydrocracking of C-8 to C-12 alkanes on Pt/US-Y zeolites
Authors: Martens, GG ×
Marin, GB
Martens, Johan
Jacobs, Pierre
Baron, GV #
Issue Date: 2000
Publisher: ACADEMIC PRESS INC
Series Title: Journal of catalysis vol:195 issue:2 pages:253-267
Conference: date:State Univ Ghent, Petrochem Tech Lab, B-9000 Ghent, Belgium; Katholieke Univ Leuven, Ctr Surface Chem & Catalysis, B-3001 Heverlee, Belgium; Free Univ Brussels, Dept Chem Engn, B-1050 Brussels, Belgium
Abstract: Hydrocracking of n-alkanes in the range n-Cs-n-C-12 was performed on two commercial Pt/US-Y zeolite catalysts at temperatures of 493-533 K, pressures of 0.5-5 MPa, and molar hydrogen-to-hydrocarbon ratios of 30-300. The experimental data were quantitatively described with a model based on independently determined physisorption parameters, quasi-equilibrated hydrogenation-dehydrogenation and protonation-deprotonation reactions, and a network of elementary reactions of alkylcarbenium ions as rate-determining steps. The preexponential factors of the rate coefficients for skeletal isomerization and carbon-carbon B-scission steps were calculated using the transition-state theory, leaving the composite activation energies of the rate-determining steps, i.e,, the sum of the activation energy and the corresponding protonation enthalpy, to be obtained by regression of the data. No statistically significant dependence on the hydrocarbon feed of the estimates for the composite activation energies was found over the investigated range of carbon numbers, Introduction of a single catalyst-dependent adjustable parameter accounting for the difference in protonation enthalpy allows us to use the set of composite activation energies obtained by regression of the data on one zeolite to describe hydrocracking on a Pt/US-Y zeolite with different acid strength. (C) 2000 Academic Press.
ISSN: 0021-9517
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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