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Vol. 26 No. 2 (2014): Vol 26 Issue 2

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Dehydrogenation of Ethylbenzene in Presence of Carbon Dioxide Over Supported Fe2O3-Cr2O3 Mixed Oxides Catalysts

https://doi.org/10.14233/ajchem.2014.15601
Ahmed Aouissi*
Department of Chemistry, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia *Corresponding author: E-mail: aouissed@yahoo.fr
Hoceine Bayahia
Department of Chemistry, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia *Corresponding author: E-mail: aouissed@yahoo.fr
Zeid A. Al-Othman
Department of Chemistry, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia *Corresponding author: E-mail: aouissed@yahoo.fr
M. Rafiq H. Siddiqui
Department of Chemistry, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia *Corresponding author: E-mail: aouissed@yahoo.fr

Asian Journal of Chemistry, Vol. 26 No. 2 (2014): Vol 26 Issue 2

Abstract

Dehydrogenation of ethylbenzene to styrene in the presence of carbon dioxide was investigated over a series of binary iron-chromium oxides (Fe2O3-Cr2O3) supported on alumina, silica and titania. The catalysts were characterized by means of XRD, IR and SEM. XRD and FT-IR characterization indicated that iron and chromium ions are dispersed into the support matrix. Compared to Fe-Cr-Si-30 and Fe-Cr-Ti-30 catalysts, Fe-Cr-Al-30 was found to be the most active (conversion = 57.2 %) and the most selective in styrene (94.1 %). The activity value was observed in the following order Fe-Cr-Al > Fe-Cr-Ti.> Fe-Cr-Si. SEM images indicated that there are no significant carbonaceous deposits on the spent Fe-Cr-Al-30 catalyst, whereas modifications of its morphological aspect were observed. The variation of Fe-Cr content in the Fe-Cr-Al catalysts showed that the activity depends strongly on the content. The optimal content determined was 50 wt- %.

Keywords

Mixed oxides Ethylbenzene dehydrogenation Styrene Carbon dioxide Support.
Aouissi*, A., Bayahia, H., A. Al-Othman, Z., & Rafiq H. Siddiqui, M. (2014). Dehydrogenation of Ethylbenzene in Presence of Carbon Dioxide Over Supported Fe2O3-Cr2O3 Mixed Oxides Catalysts. Asian Journal of Chemistry, 26(2), 504–508. https://doi.org/10.14233/ajchem.2014.15601
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