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Dehydrogenation of Methylcyclohexane for On-Board Hydrogen Use: Initial Rate Kinetics Over 1.0 wt% Pt/γ-Al2O3

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Abstract

Dehydrogenation of methylcyclohexane was studied over an in-house developed 1.0 wt% Pt/γ-Al2O3 catalyst. Experiments were conducted at various levels of temperature, pressure, space velocity, and feed composition. With increase in W/F A0, the methylcyclohexane conversion was observed to increase exponentially towards the equilibrium or maximum conversion. The function “exponential rise to maximum” is used to represent the experimental data and initial rates of the reaction were employed to analyze the data. A power law model and two Langmuir–Hinshelwood–Hougen–Watson (LHHW) models (single-site and dual-site) were applied to model the experimental data. Kinetic model equation based on dual-site LHHW was found the most appropriate with activation energy of the reaction system equal to 62.9 kJ/mol.

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Abbreviations

a :

A parameter in Eq. 2

b :

A parameter in Eq. 2

B :

Dimensionless activation energy

E :

Activation energy (J/mol)

F A0 :

Initial molar flowrate of methylcyclohexane (mol/s)

k :

Reaction rate constant

k r :

Rate constant at reference temperature (T r)

K :

Equilibrium constant for the dehydrogenation of methylcyclohexane (Pa3)

K A :

Adsorption equilibrium constant for methylcyclohexane (Pa−1)

K B :

Adsorption equilibrium constant for toluene (Pa−1)

K C :

Adsorption equilibrium constant for hydrogen (Pa−1)

K′:

Ratio of equilibrium constants as defined in Eq. 11

nA :

Order of the reaction with respect to methylcyclohexane

N :

Number of data points

p :

Reaction pressure (Pa)

p A0 :

Initial partial pressure of methylcyclohexane (Pa)

p B0 :

Initial partial pressure of toluene (Pa)

p C0 :

Initial partial pressure of hydrogen (Pa)

P :

Number of parameters

(−r):

Rate of the reaction (mol kg-cat−1 s−1)

(−r)0 :

Initial rate of the dehydrogenation reaction (molkg-cat−1 s−1)

R :

Universal gas constant (Pa m3 mol−1 K−1)

T :

Reaction temperature (K)

T r :

Reference temperature (K)

T wall :

Reactor wall temperature (K)

W :

Weight of catalyst (kg)

X :

Methylcyclohexane conversion

X e :

Equilibrium methylcyclohexane conversion

X mod :

Model or calculated conversion of methylcyclohexane

X obs :

Observed conversion of methylcyclohexane

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Authors and Affiliations

  1. Institute of Chemical Engineering and Technology, University of the Punjab, Lahore, 54590, Pakistan

    Muhammad R. Usman & Rabya Aslam

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  1. Muhammad R. Usman
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  2. Rabya Aslam
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Correspondence to Muhammad R. Usman.

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Usman, M.R., Aslam, R. Dehydrogenation of Methylcyclohexane for On-Board Hydrogen Use: Initial Rate Kinetics Over 1.0 wt% Pt/γ-Al2O3 . Arab J Sci Eng 39, 615–620 (2014). https://doi.org/10.1007/s13369-013-0694-y

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  • DOI: https://doi.org/10.1007/s13369-013-0694-y

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