NDLI: Dehydrogenation of ethylbenzene over Fe–Ce–Rb and Fe–Ce

Content Provider	Springer Nature Link
Author	Ka, Yusuke Ohshima, Masa aki Kurokawa, Hideki Miura, Hiroshi
Copyright Year	2013
Abstract	Fe–Ce mixed oxide catalysts promoted by Rb and Cs have been investigated for the dehydrogenation of ethylbenzene. Fe–Ce–Rb and Fe–Ce–Cs were found to be highly active. X-ray diffraction (XRD) analysis confirmed the formation of RbFeO$_{2}$ and CsFeO$_{2}$ in the catalyst. X-ray photoelectron spectroscopy (XPS) analysis suggests a surface composition of the catalysts with an atomic ratio of Rb/Fe = 1, Cs/Fe = 1 and O/Fe = 2, meaning the surface is composed of the binary oxides, RbFeO$_{2}$ and CsFeO$_{2}$. We conclude that the active phases of these catalysts are RbFeO$_{2}$ and CsFeO$_{2}$, similar to KFeO$_{2}$ in the case of K–Fe and Fe–Ce–K mixed oxide catalysts. The rate equation of the reaction was determined supposing a Langmuir–Hinshelwood mechanism, in which the competitive adsorption of ethylbenzene and styrene dominate the reaction rate. However, the relative adsorption constant of styrene, Z $_{ST}$, did not change significantly with the addition of Rb or Cs. The rate constant k increased with the addition of Rb or Cs. The activation energy increased with the addition of Rb or Cs compared with Fe–Ce, and the frequency factor also increased remarkably. Because the strong base points are most likely the active sites, addition of Rb and Cs increased the number of basic sites on the catalyst surface, resulting in higher activity. The kinetic factors, k and Z $_{ST}$, were applied for the rate equation. The experimental results were in very good agreement with the derived rate equation.
Starting Page	29
Ending Page	41
Page Count	13
File Format	PDF
ISSN	18785190
Journal	Reaction Kinetics and Catalysis Letters
Volume Number	109
Issue Number	1
e-ISSN	18785204
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-03-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ethylbenzene dehydrogenation Iron oxide Rubidium addition Cesium addition Langmuir–Hinshelwood mechanism Rate equation Catalysis Physical Chemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Catalysis

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