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.
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Abbreviations
- \(K_{DeOH}\) :
-
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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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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Echaroj, S., Santikunaporn, M. & Chavadej, S. Micro-kinetic modeling of the catalytic dehydration of 1-decanol over precipitated γ-Al2O3 . Reac Kinet Mech Cat 114, 75–91 (2015). https://doi.org/10.1007/s11144-014-0782-3
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DOI: https://doi.org/10.1007/s11144-014-0782-3