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| Home > Publications database > High-Temperature Systems for a catalytic CO-Shift Membrane Reactor |
| Abstract | FZJ-2015-02728 |
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2015
Abstract: High-Temperature Systems for a catalytic CO-Shift MembraneReactorDésirée van Holt, Emanuel Forster , Wilhelm A. Meulenberg, Michael Müller, Mariya E.Ivanova, Stefan Baumann, Robert VaßenForschungszentrum Jülich, Institute of Energy and Climate Research, Leo-Brandt-Str., D-52425Juelich, Germanycorresponding author: d.van.holt@fz-juelich.deThe sequestration of CO2 via H2-selective, ceramic membranes in an IGCC-power plantis a highly interesting method, particularly for the high-temperature range of600 °C − 900 °C, due to the low efficiency losses that can be reached. It was shown thateven for this high-temperature range the utilization of a CO-shift catalyst leads to aconsiderable increase of the CO-conversion, at least up to 900 °C compared to anoperation mode without catalyst[1]. However, the harsh conditions of an IGCC-powerplant lead to very challenging operation conditions for the dense H2-selectivemembranes as well as for the CO-shift-catalysts.The present work aimed at the development of thermo-chemically and microstructurallystable, active and compatible membrane-catalyst systems for futurecatalytic CO-shift membrane-reactors. Therefore, the ceramic mixed protonic electronicconductors BaCe0.2Zr0.7Yb0.08Ni0.02O3−d and La5.5WO12−d were combined with ironbased catalysts like Fe/Cr/Cu-spinels. These materials were already studied intensivelyregarding the planned applications and show very good properties [2]. Additionally, formembrane-catalyst systems it is strongly required that the combined components donot influence each other negatively i.e. by diffusion or reaction.Figure: SEM picture of a cross section through a membrane-catalyst system of a 86Fe14Cr-catalyst on atape cast supported La5.5WO12−d-membrane after operation in a membrane reactor at 850 °C.The investigation identified material combinations that seem to be highly applicablefor future catalytic CO-shift membrane reactors in the high-temperature range up to900 °C. As shown in the figure above, the 86Fe14Cr-spinel catalyst and the La5.5WO12−d-membrane show very good compatibility. Additional investigations on membranereactorperformance, long term stability and scale up are necessary.[1] D. van Holt, Keramische Membranen für die H2-Abtrennung in CO-Shift-Reaktoren, DissertationRuhr-Universität Bochum 2014.[2] D. van Holt, E. Forster, M.E. Ivanova, W.A. Meulenberg, M. Müller, S. Baumann, R. Vaßen, Ceramicmaterials for H2 transport membranes applicable for gas separation under coal-gasification-relatedconditions, J. Eur. Ceram. Soc. 34 (2014) 2381 – 2389.
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