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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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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, 56-68. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WHJ-4C7DCK3-5-4X&_cdi=6852&_user=28741&_orig=browse&_coverDate=07%2F01%2F2004&_sk=997749998&view=c&wchp=dGLbVlz-zSkWb&md5=78aaf4b135dbc30abb6a4d05ecb62f2a&ie=/sdarticle.pdf.


Cite as: http://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.