Fouling of a platinum reforming catalyst accompanying the dehydrogenation of methyl cyclohexane

A model for the dehydrogenation of methylcyclohexane in a tubular reactor over an industrial catalyst Pt‐Sn/Al2O3 has been established. This model takes into account the axial dispersion at the inlet of the catalytic bed reactor as well as the heat transfer at the wall of the reactor. The heat transfer at the wall is satisfactorily represented by using a heat transfer coefficient correlation for which the parameters are obtained by fitting to the experimental data. The model provides a good representation of the radial and axial temperature profiles in the packed bed and can be also used to calculate the conversion.

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“…The presence of hydrogen in the feed is required only to assure a constant catalyst activity. This was also found by Jossens and Petersen (1982).…”

Section: Variation Of the Pressure Within The Reactorsupporting

confidence: 77%

A mathematical model for the dehydrogenation of methylcyclohexane in a packed bed reactor

Touzani

Klvana

Bélanger³

1987

Can J Chem Eng

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“…This reparameterisation was done to decrease the correlation among the parameters and to facilitate the convergence [10]. As mentioned before, on each day, four experimental runs were carried out and then the catalyst was regenerated overnight, a short term deactivation function suggesting that the rate of reaction decreased linearly with the daily time of use (t d ) was therefore included in the rate equation [Eqn (6)]. k r , B, and k d were now the three kinetic parameters that were to be determined during the regression procedure.…”

Section: Basic Equation and Regression Proceduresmentioning

confidence: 99%

“…However, Rohrer and Sinfelt [5], Jossens and Petersen [6], Usman et al [7], and Usman et al [8] have observed, at low pressures, an enhancement in the rate of the dehydrogenation reaction on the addition of hydrogen in the feed. One possible reason for this observation may be explained on the basis of the associative adsorption of MCH with hydrogen at low pressures, i.e., at a low pressure, hydrogen facilitates in the adsorption of MCH.…”

Section: Introductionmentioning

confidence: 99%

Associative Adsorption Kinetics: A Novel Kinetic Model for the Dehydrogenation of Methylcyclohexane

Akram

Munir

Usman

2014

Progress in Reaction Kinetics and Mechanism

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Methylcyclohexane (MCH) dehydrogenation is an important reforming reactionand is considered as a model naphthene dehydrogenation reaction. An increase in the rate of this reaction with the addition of hydrogen at low pressures has been observed by various researchers in the field. This enhancement in rate is described, in the present study, using the concept of associative adsorption of MCH with hydrogen in Langmuir -Hinshelwood -Hougen -Watson singlesite and dual-site surface reaction mechanisms. The various rate equations developed on these bases are tested against the experimental data of Usman over Pt/Al 2 O 3 and the best-fit rate model is presented. An activation energy of 52.0 kJ mol -1 is obtained for the best-fit rate model.

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“…The kinetics of the MCH dehydrogenation reaction over Pt‐loaded alumina catalyst has been studied by a number of investigators 7‐9,10‐27 . The pioneering work was conducted by Sinfelt et al 11 who, for the dehydrogenation reaction, proposed a two‐step nonequilibrium adsorption reaction mechanism.…”

Section: Introductionmentioning

confidence: 99%

An exclusive kinetic model for the methylcyclohexane dehydrogenation over alumina‐supported Pt catalysts

Akram

Aslam

AlHumaidan

et al. 2020

Int J of Chemical Kinetics

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The experimental data of six different types of Pt-containing alumina catalysts are used to study the detailed and rigorous kinetics of the methylcyclohexane dehydrogenation reaction. A large number of kinetic rate equations were formulated using the power law kinetics and the Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetics, which were tested against the experimental data. For each catalyst, the elementary reaction step "the loss of first molecular hydrogen" in the LHHW single-site surface reaction mechanism was observed to be the rate-determining step. The form of the kinetic rate model developed in the study is believed to be applicable to any Pt-loaded alumina catalyst. K E Y W O R D Sdehydrogenation, Langmuir-Hinshelwood-Hougen-Watson kinetics, methylcyclohexane, organic hydride, Pt catalystInt J Chem Kinet. 2020;52:415-449.

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Fouling of a platinum reforming catalyst accompanying the dehydrogenation of methyl cyclohexane

Cited by 53 publications

References 7 publications

A mathematical model for the dehydrogenation of methylcyclohexane in a packed bed reactor

A mathematical model for the dehydrogenation of methylcyclohexane in a packed bed reactor

Associative Adsorption Kinetics: A Novel Kinetic Model for the Dehydrogenation of Methylcyclohexane

An exclusive kinetic model for the methylcyclohexane dehydrogenation over alumina‐supported Pt catalysts

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