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Ethylbenzene dehydrogenation on Fe2O3-Cr 2O3-K2CO3 catalysts promoted with transitional metal oxides

Dulami??, N., M?ic?neanu, A., Sayle, D.C., Stanca, M., Cr?ciun, R., Olea, M., Afloroaei, C., Fodor, A. (2005) Ethylbenzene dehydrogenation on Fe2O3-Cr 2O3-K2CO3 catalysts promoted with transitional metal oxides. Applied Catalysis A: General, 287 (1). pp. 9-18. ISSN 0926-860X. (doi:10.1016/j.apcata.2005.02.037) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1016/j.apcata.2005.02.037

Abstract

The effect of titanium, vanadium and cerium oxides on the activity and selectivity of Fe2O3-based catalysts for ethylbenzene (EB) dehydrogenation reaction has been examined in an integral fixed bed reactor. For all single- or double-promoted catalysts, the selectivity to styrene was higher than that for the unpromoted catalyst. For the V2O5-promoted catalyst, an optimum content of 3 wt.% was found with respect to the selectivity to styrene. Moreover, by promoting the standard catalyst with a combination of TiO2/CeO2 up to 6 wt.%, the activation energy decreased by 10 kJ/mol. The physicochemical properties of the promoted Fe2O3-Cr2O3-K2CO3 catalysts were examined using N2 adsorption, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques. All catalysts were macroporous, 65–75% of pores having a radius larger than 150 Å. No diffraction patterns specific to TiO2 or V2O5 were observed. A CeO2 crystalline phase was present in the single promoted catalyst and in the double promoted with TiO2 as well. The average size of crystals was 48.6 nm for single and 21.4 nm for the double one. The XPS results confirmed the better dispersion of CeO2 in the presence of TiO2. Based on experimental data several kinetic models were proposed and kinetic parameters were estimated using a non-linear least squares optimization procedure. The Langmuir–Hinshelwood–Hougen–Watson (LHHW) kinetic model with surface reaction rate-determining step better described the experimental data.

Item Type: Article
DOI/Identification number: 10.1016/j.apcata.2005.02.037
Uncontrolled keywords: Dehydrogenation, Ethylbenzene, Fe2O3-Cr 2O3-K2CO3, LHHW kinetic model, Styrene, Transitional metal oxides, Activation energy, Catalyst activity, Chromium compounds, Dehydrogenation, Styrene, X ray diffraction analysis, X ray photoelectron spectroscopy, Ethylbenzene, LHHW kinetic model, Transition metal oxides, Iron alloys
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Dean Sayle
Date Deposited: 20 Mar 2015 16:12 UTC
Last Modified: 23 Jan 2020 04:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46802 (The current URI for this page, for reference purposes)
Sayle, D.C.: https://orcid.org/0000-0001-7227-9010
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