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Functionalization of ceramic foams for high-temperature catalytic applications illustrated by the development of a lean gas reactor

Darstellung der Funktionalisierung von Schaumkeramik für Hochtemperatur-Katalysatoranwendungen am Beispiel der Entwicklung eines Schwachgasgenerators
: Böttge, D.; Adler, J.

Stephani, G.; Hipke, T.; Scheffler, M.; Adler, J. ; Deutsche Gesellschaft für Materialkunde e.V. -DGM-, Oberursel; Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung -IFAM-, Dresden; Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik -IWU-, Chemnitz:
International Conference on Cellular Materials, CellMat 2010. Proceedings : Held in Dresden, Germany from 27-29 Oct 2010
Dresden, 2010
International Conference on Cellular Materials (CellMat) <2010, Dresden>
Fraunhofer IKTS ()

The present work demonstrates that ceramic foams can be functionalized with homogeneous thin washcoat layers by a special coating technology which combines dip and spin coating. This technology can also be adapted to other material systems. The washcoat system, developed in the scope of this work, is built up of three layers. As a consequence of the excellent results from catalytic and long-term stability measurements, manganese impregnated catalyst inserts are suitable for catalytic oxidation of lean gases. The maximum of the reaction temperature in a technical plant should not exceed 1 200 deg C. By using certain catalytic components (e.g. precious metals) it is possible to apply the developed washcoat system for specific catalytic applications, for instance as afterburner in fuel cell systems. However, independent of the application it is necessary to choose a calcination temperature, which is 100 C higher than the operating temperature. This procedure helps to remain the long-term stability of the catalytic system. Further research will be carried out to improve the oxidation stability of the SiC foam carrier by minimizing the micro-porosity. Furthermore, it might be interesting to use alternative ceramic foams as carrier, e.g. mullite.