Dehydrogenation of ethylbenzene over TiO2-Fe2O3 and ZrO2-Fe2O3 mixed oxide catalysts |
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| Authors: | Jung-Chung Wu Der-Sun Liu An-Nan Ko |
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| Affiliation: | (1) Refining and Manufacturing Research Center, Chinese Petroleum Corporation, 239 Min-Sheng S. Road, Chia-Yi, Taiwan 60036, ROC;(2) Department of Chemistry, Tunghai University, Taichung, Taiwan, ROC |
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| Abstract: | The mixed metal oxides TiO2-Fe2O3 and ZrO2-Fe2O3 were examined as potential catalysts for the dehydrogenation reaction of ethylbenzene. The acidic and basic properties and surface area, pore volume and pore size distribution of these catalysts were measured. The catalytic activities can be correlated very well with the surface area and the acidity and basicity of ZrO2-Fe2O3 catalysts. However, for TiO2-Fe2O3 catalysts, the surface area, the amount of acidic and basic sites and TiFe2O5 crystallinity are all important factors affecting the catalytic activities for ethylbenzene dehydrogenation. A synergistic effect was found for the TiO2-Fe2O3 and ZrO2-Fe2O3 catalyst system and also for the TiO2-Fe2O3-ZrO2 system, i.e. the activities of these catalysts can be ranked in the following order: TiO2-Fe2O3-ZrO2>TiO2-Fe2O3 >ZrO2>Fe2O3>TiO2. Meanwhile, all of these catalysts showed higher activities than the conventional potassium-promoted iron catalysts. |
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| Keywords: | Dehydrogenation of ethylbenzene TiO2-Fe2O3 ZrO2-Fe2O3 TiO2-Fe2O3-ZrO2 mixed oxides bifunctional mechanism synergistic effect styrene |
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