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Direct Oxidation of Benzene to Phenol 9781586036911

Direct Oxidation of Benzene to Phenol

Investigation of the Active Iron Species in [Fe,Al]MFI Catalysts by Fe Mössbauer Spectroscopy

ISBN-10: 1586036912
ISBN-13: 9781586036911
AUTHOR:
PUBLISHER: IOS Press, Incorporated
Also available at Amazon.com
Note: Not guaranteed to come with supplemental materials (access codes, CDs, DVDs)
Product Description: Fe-containing ZSM-5 zeolite, or Fe, Al]MFI, is known to catalyse various chemical reactions. Recently, it has gained increasing attention for its catalytic performance in the direct oxidation of benzene to phenol, using N2O as oxidant (BTOP). However, despite extensive efforts, the nature of the active sites in the Fe, Al]MFI catalyst for the BTOP reaction is still largely unknown. This is mainly due to various synthesis and activation methods of Fe, Al]MFI catalysts that have led to different interpretations. Nevertheless, there seems to be a consensus in open literature that steam-treatment of isomorphously substituted Fe, Al]MFI zeolite forms a particular extra-framework iron species that is catalytically active in the BTOP reaction. In situ 57Fe, Mossbauer studies show that there are several active sites for the direct oxidation of benzene to phenol. These active sites are most likely small clusters of iron species with low nuclearity (e.g. enzyme-like systems). Subjecting the Fe, Al]MFI catalysts to several controlled treatments confirms that there is a distribution of several extra-framework iron species, even at ppm levels. extra-framework iron species formed after steam-treatment, which makes it difficult to establish a direct relationship between structure and activity in the BTOP reac

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CATEGORY: Science
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