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Reaction Kinetics, Mechanisms and Catalysis

, Volume 102, Issue 2, pp 263–282 | Cite as

Kinetics of toluene hydrogenation—integrating a dynamic approach regarding catalyst activity

  • Aqeel Ahmad Taimoor
  • Isabelle Pitault
Article

Abstract

Gas phase toluene hydrogenation is investigated over Pt/Al2O3 catalyst with temperature ranging from 75 to 125 °C and at atmospheric pressure. Strong activity variations are observed during long duration experiments. These variations are thoroughly investigated and a mechanistic model is proposed with dynamic adsorption activity of the reactants, used to explain the decrease in catalyst activity. This model considers competitive adsorption behaviour of the reactants and dissociative adsorption of hydrogen. Such a model can also be used to explain the strong metal-support interaction (SMSI) effect induced by the catalyst support. The decrease in activity after temperature maxima as previously observed can also be addressed by the approach presented. A comparison of activity variation at different residence times i.e. 20–50 kgcat·s·mol−1 and different hydrogen and toluene partial pressures is also simulated.

Keywords

Toluene hydrogenation Activity variation Reaction kinetics 

List of Symbols

Alphabetical Symbols

i

Stoichiometric constant

j

Stoichiometric constant

\({\mathbb{C}}\)

Sites on platinum (mol·kgcat −1)

C

Concentration of species (mol·m−3)

k

Rate parameters for hydrogenation reaction

P

Partial pressures (Pa)

r

Reaction rate

S

Sites offered by support (mol·kgcat −1)

T

Temperature (K)

t

Time (s)

Tol

Toluene

Greek Symbols

α

Hydrogen reaction order

Γ

Deactivation factor

Superscripts

*

Species adsorbed on platinum

s

Species adsorbed on support

d

Order of deactivation

Subscripts

ad, H2

Hydrogen adsorption

adTol

Toluene adsorption

d, H2

Hydrogen desorption

dTol

Toluene desorption

H2

Hydrogen

Tol

Toluene

t

Total

Notes

Acknowledgments

We are thankful to Government of Pakistan (Higher Education Commission) for supporting this research work through a doctoral grant to Aqeel Ahmad TAIMOOR.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  1. 1.Laboratoire de Génie des Procédés Catalytiques LGPC—CNRS/CPE LyonVilleurbanne CedexFrance

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