Styrene synthesis: In-situ characterization and reactivity studies of 
unpromoted and potassium promoted iron oxide model catalysts

Shekhah, Osama; Ranke, Wolfgang; Schlögl, Robert

doi:10.1016/j.jcat.2004.03.024

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Styrene synthesis: In-situ characterization and reactivity studies of unpromoted and potassium promoted iron oxide model catalysts

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Shekhah, Osama
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Ranke, Wolfgang
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl, Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Shekhah, O., Ranke, W., & Schlögl, R. (2004). Styrene synthesis: In-situ characterization and reactivity studies of unpromoted and potassium promoted iron oxide model catalysts. Journal of Catalysis, 225(1), 56-68. doi:10.1016/j.jcat.2004.03.024.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0C90-E

Abstract

Styrene synthesis over iron oxide model catalysts was studied by combining UHV characterization methods with in-situ conversion measurements in a micro-flow reactor under realistic reaction conditions. Both unpromoted Fe2O3 and K-promoted model catalysts show a similar high starting activity while that of Fe3O4 is clearly lower. Water limits and K-promotion slows down deactivation by coking and oxide reduction. The deactivation can be prevented and the high initial yield preserved by adding a small amount of oxygen to the feed. Both the presence of Fe3+ and intermediate adsorption strength for ethylbenzene and styrene are essential for high conversion yields.