Kinetic model of the dehydrogenation of methylcyclohexane over monometallic and bimetallic Pt catalysts

Faisal Alhumaidan, David Cresswell, Arthur Garforth

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    Various kinetic models were developed for methylcyclohexane (MCH) dehydrogenation over supported Pt catalysts. The best fitting mechanistic model is of the non-Langmuirian/noncompetitive Horiuti-Polanyi type. In this model, the Horiuti-Polanyi aromatic hydrogenation mechanism, which assumes an atomic hydrogen addition to aromatics on the catalyst surface, is applied in reverse to MCH dehydrogenation. The model also assumes that hydrogen and MCH molecules adsorb noncompetitively on two different types of sites to accommodate the observed near zero-order dependence of reaction rate on MCH and the negative order dependence upon hydrogen. To account for the increase in the hydrogen inhibition effect with pressure, a non-Langmuirian adsorption isotherm is adopted, which assumes a nonlinear dependency between the adsorption equilibrium constant for hydrogen and the system pressure. The reversible and irreversible deactivation kinetics are satisfactorily included in the kinetic model. © 2010 American Chemical Society.
    Original languageEnglish
    Title of host publicationIndustrial and Engineering Chemistry Research|Ind. Eng. Chem. Res.
    Number of pages13
    Publication statusPublished - 2 Mar 2011


    • Adsorption equilibrium constants
    • Aromatic hydrogenation
    • Atomic hydrogen
    • Catalyst surfaces
    • Deactivation kinetics
    • Inhibition effect
    • Kinetic models
    • Mechanistic models
    • Methylcyclohexane
    • Nonlinear dependencies
    • Pt catalysts
    • Supported Pt
    • System pressure
    • Adsorption
    • Adsorption isotherms
    • Catalyst supports
    • Dehydrogenation
    • Equilibrium constants
    • Kinetic theory
    • Platinum
    • Pressure effects
    • Reaction rates
    • Hydrogen


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