Reaction Kinetics, Mechanisms and Catalysis

, Volume 114, Issue 1, pp 75–91 | Cite as

Micro-kinetic modeling of the catalytic dehydration of 1-decanol over precipitated γ-Al2O3

  • Snunkheam Echaroj
  • Malee Santikunaporn
  • Sumaeth Chavadej
Article
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Abstract

The mechanisms of the dehydration reaction of 1-decanol to 1-decene over precipitated gamma-alumina (γ-Al2O3) by means of the micro-kinetic modeling approach were investigated. Experimental data were collected in the reaction temperature range of 533–608 K, while the retention time was varied from 0.029 to 0.15 h. The γ-Al2O3 catalyst was synthesized using a traditional precipitation method. The yield of both internal olefins and 1-decene increased with increasing reaction temperature. Conversely, the yield of di-n-decyl ether decreased with increasing temperature. An increase in retention time increased the yield of 1-decene and internal olefins. These experimental data correlated well with the rate equation that assumes the formation of 1-decene to be reversible and a dual-site reaction. It is reasonable to state that internal isomerization is reversible with a single-site reaction. The apparent activation energy for the dehydration reaction of 1-decanol to 1-decene, obtained from the Arrhenius plot data, was 102 ± 2 kJ/mol.

Keywords

Dehydration 1-Decanol 1-Decene Internal isomerization Precipitation Gamma-alumina 

List of symbols

\(K_{DeOH}\)

Equilibrium constant for the adsorption of 1- decanol

\(K_{{D_{1} }}\)

Equilibrium constant for the adsorption of 1-decene

\(K_{{D_{2} }}\)

Equilibrium constant for the adsorption of internal olefins

\(K_{DDE}\)

Equilibrium constant for the adsorption of di-n-decyl ether

\(P_{i}\)

Partial pressure of species i

\(\theta_{V}\)

Fractional coverage of vacant sites

\(\theta_{i}\)

Fractional coverage of species i

\(S\)

Vacant sites

W

Water molecule (H 2 O)

\(k_{{s,D_{1} }}^{ + }\)

Rate constant for the forward dehydration reaction to 1-decene

\(k_{{s,D_{1} }}^{ - }\)

Rate constant for the backward dehydration reaction to 1-decanol

\(k_{{s,D_{2} }}^{ + }\)

Rate constant for the forward isomerization reaction to internal olefins

\(k_{{s,D_{2} }}^{ - }\)

Rate constant for the backward isomerization reaction to 1-decene

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Notes

Acknowledgments

The authors gratefully acknowledge financial supports from the PTT Public Company Ltd., Thailand and Faculty of Engineering, Thammasat University. Thailand Research Fund (TRF) is also acknowledged for providing a TRF Senior Research Scholar Grant (RTA578008) to the third author.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2014

Authors and Affiliations

  • Snunkheam Echaroj
    • 1
  • Malee Santikunaporn
    • 1
  • Sumaeth Chavadej
    • 2
  1. 1.Department of Chemical Engineering, Faculty of EngineeringThammasat UniversityPathumthaniThailand
  2. 2.Petrochemical CollegeChulalongkorn UniversityBangkokThailand

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