Journal Article

PreJuSER-14845

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Oxygen Permeation and Stability Investigations on MIEC Membrane Materials Under Operating Conditions for Power Plant Processes

Engels, S.FZJ* ; Markus, T.FZJ* ; Modigell, M. ; Singheiser, L.FZJ*

2011
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.memsci.2010.12.021

Abstract: MIEC membranes (mixed ion-electron conducting membranes) are attracting increasing interest for industrial applications in which oxygen-enriched air or pure oxygen is used. One of these applications is the oxyfuel power plant process. High oxygen permeability and adequate chemical stability under operating conditions, especially with respect to CO2 and SO2, are therefore essential. In the work described here, permeation and chemical stability tests were performed with tubular membranes made of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF), Sr0.5Ca0.5Mn0.8Fe0.2O3-delta (SCMF) and La2NiO4+delta. To investigate the effects on the materials, microstructure analysis were performed before and after each experimental run by means of energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the highest permeability can be reached with BSCF membranes, but BSCF displays instability with respect to CO2. The other materials show higher chemical stability without any significant degradation effects caused by CO2, but they do display instability if the sweep gas contains 360 ppm SO2. Furthermore, poisoning of the membrane materials by chromium evaporated from the steel was detected in the case of BSCF and SCMF membranes. (C) 2010 Elsevier B.V. All rights reserved.

Keyword(s): J ; MIEC membranes (auto) ; Oxyfuel (auto) ; BSCF (auto) ; SCMF (auto) ; La2NiO4+delta (auto) ; Chemical stability (auto)

Note: The authors gratefully acknowledge financial support by BMWi and MIWFT (NRW) as well as from the companies RWE Power AG, E.ON AG, Hitachi Power Europe, Linde AG, MAN Turbo and WS-Warmeprozesstechnik ("OXYCOAL-AC"). We also acknowledge the support of the Initiative and Networking Fund of the Helmholtz Association, contract HA-104 ("MEMBRAIN"), and the JARA Energy Research Alliance of RWTH Aachen University and Forschungszentrum Julich.

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)
2. Halbleiter-Nanoelektronik (PGI-9)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2011

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