Deactivation kinetics of platinum-based catalysts in dehydrogenation of higher alkanes

The deactivation of promoted Pt-Al 2O 3 catalyst in dehydrogenation of C 10–C 14 normal paraffins to the corresponding mono-olefins was studied. Two models based on reversible and irreversible main reaction and nth order, concentration-independent deactivation kinetic was used. The kinetic parameter...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2009-11, Vol.154 (1), p.76-81
Main Authors: Saeedizad, Maryam, Sahebdelfar, Saeed, Mansourpour, Zahra
Format: Article
Language:English
Subjects:
Activation energy
Catalysis
Catalyst deactivation
Catalysts
Deactivation
Decay
Dehydrogenation
Dehydrogenation of paraffins
Kinetics
Mathematical models
Pt/Al 2O 3 catalyst
Reaction kinetics
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Summary:The deactivation of promoted Pt-Al 2O 3 catalyst in dehydrogenation of C 10–C 14 normal paraffins to the corresponding mono-olefins was studied. Two models based on reversible and irreversible main reaction and nth order, concentration-independent deactivation kinetic was used. The kinetic parameters were obtained by utilizing non-linear estimation functions of industrial plant time–temperature trajectory data. The reversible reaction model showed a better fit to the plant data. The results were also checked through integral analysis of experimental data. The results of both approaches were consistent and showed a second-order decay law. The activation energies of the dehydrogenation and catalyst decay were found to be E A = 90 kJ/mol and E d = 140 kJ/mol, respectively. The larger activation energy for catalyst deactivation compared to that of main reaction implies that catalyst decay is much more temperature sensitive than main reaction.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2009.03.017