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However, O<jats:sub>2<\/jats:sub> separation in industrial environments demands very high stability and effectiveness in the presence of CO<jats:sub>2<\/jats:sub>\u2010 and SO<jats:sub>2<\/jats:sub>\u2010bearing process gases. Here, the composition of dual\u2010phase membranes based on NiFe<jats:sub>2<\/jats:sub>O<jats:sub>4<\/jats:sub>\u2013Ce<jats:sub>0.8<\/jats:sub>Tb<jats:sub>0.2<\/jats:sub>O<jats:sub>2\u2212<jats:italic>\u03b4<\/jats:italic><\/jats:sub> (NFO\u2010CTO) was optimized and the effective performance of catalytically\u2010activated membranes was assessed in presence of CO<jats:sub>2<\/jats:sub> and SO<jats:sub>2<\/jats:sub>. Further insight into the limiting mechanisms in the permeation was gained through electrical conductivity studies, permeation testing in several conditions and impedance spectroscopy analysis. The dual\u2010phase membranes were prepared by one\u2010pot sol\u2010gel method and their permeability increases with increasing fluorite content. An O<jats:sub>2<\/jats:sub> flux of 0.25\u2005(ml\u2009min<jats:sup>\u22121<\/jats:sup>\u2009cm<jats:sup>\u22122<\/jats:sup>)\u2009mm at 1000\u2009\u00b0C was obtained for a thick self\u2010standing membrane with 40:60 NFO\/CTO composition. An in\u2010depth study mimicking typical harsh conditions encountered in oxyfuel flue gases was performed on a 50:50 NFO\/CTO membrane. CO<jats:sub>2<\/jats:sub> content as well as SO<jats:sub>2<\/jats:sub> presence in the sweep gas stream were evaluated in terms of O<jats:sub>2<\/jats:sub> permeation. O<jats:sub>2<\/jats:sub> fluxes of 0.13 and 0.09\u2005mL\u2009min<jats:sup>\u22121<\/jats:sup>\u2009cm<jats:sup>\u22122<\/jats:sup> at 850\u2009\u00b0C were obtained for a 0.59\u2005mm thick membrane under CO<jats:sub>2<\/jats:sub> and 250\u2005ppm SO<jats:sub>2<\/jats:sub> in CO<jats:sub>2<\/jats:sub> sweep conditions, respectively. Extended periods at work under CO<jats:sub>2<\/jats:sub>\u2010 and SO<jats:sub>2<\/jats:sub>\u2010containing atmospheres revealed good permeation stability over time. Additionally, XRD, backscattered electrons detector (BSD)\u2010SEM, and energy\u2010dispersive X\u2010ray spectroscopy (EDS) analysis of the spent membrane confirmed material stability upon prolonged exposure to SO<jats:sub>2<\/jats:sub>.<\/jats:p>","DOI":"10.1002\/cssc.201500951","type":"journal-article","created":{"date-parts":[[2015,11,20]],"date-time":"2015-11-20T08:00:02Z","timestamp":1448006402000},"page":"4242-4249","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Dual\u2010Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide"],"prefix":"10.1002","volume":"8","author":[{"given":"Julio","family":"Garcia\u2010Fayos","sequence":"first","affiliation":[{"name":"Instituto de Tecnolog\u00eda Qu\u00edmica, Consejo Superior de Investigaciones Cient\u00edficas Universidad Polit\u00e9cnica de Valencia  Av. 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