Abstract
A new sol–gel synthesis route for alumina–samaria mixed aero- and xerogel catalysts based on the so-called epoxide addition method and the use of these systems as catalysts for the oxidative coupling of methane (OCM) is reported. As precursors simple chloride or nitrate salts can be used. The mesoporous materials are X-ray amorphous even after calcination to 800 °C and show an intimate mixing of Al and Sm on the nanoscale. In the case of the xerogels derived from chlorides, C2 yields comparable to pure samaria can be achieved under OCM reaction conditions with 100 % O2 conversion. Even at lower O2 conversions the activity of the xerogel is competitive with a pure samaria reference catalyst taking the lower samaria content of 20 % into account. Accordingly, the approach is suitable to reduce the costs associated with the rare earth oxide. In addition to the preparation of aerogel and xerogel particles, the presented synthesis also allows the fabrication of xerogel films which can be coated on a suitable (monolithic) support. First results of such films are presented.
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Acknowledgements
We thank Prof. Th. Gesing and Dr. J. Birkenstock (University Bremen) for assistance with the XRD experiments and Dr. Karsten Thiel (Fraunhofer Institute IFAM, Bremen) and Dr. Volkmar Zielasek (University Bremen) for TEM measurements. We also gratefully acknowledge financial support for this work provided by the Deutsche Forschungsgemeinschaft (DFG) through Grant number BA1710/19-1 and the National Science Foundation, Division of Chemistry, through Grant number 1026712. BN is grateful for a stipend of the Deutsche Telekom Stiftung. TE is grateful for a graduate student fellowship from the University of Florida.
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Neumann, B., Elkins, T.W., Gash, A.E. et al. Sol–Gel Preparation of Samaria Catalysts for the Oxidative Coupling of Methane. Catal Lett 145, 1251–1261 (2015). https://doi.org/10.1007/s10562-015-1522-7
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DOI: https://doi.org/10.1007/s10562-015-1522-7