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000841285 1001_ $$0P:(DE-HGF)0$$aGarcia-Fayos, Julio$$b0
000841285 245__ $$aDual-phase membrane based on LaCo $_{0.2}$ Ni $_{0.4}$ Fe $_{0.4}$ O $_{3−x}$ -Ce $-{0.8}$ Gd $_{0.2}$ O $_{2−x}$ composition for oxygen permeation under CO $_{2}$ /SO $_{2}$ -rich gas environments
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000841285 520__ $$aA dual-phase material with high ambipolar conductivity composed by the perovskite LaCo0.2Ni0.4Fe0.4O3-δ (LCNF) as the electronic phase and the fluorite Ce0.8Gd0.2O2-δ (CGO20) as oxide-ion conductor is proposed for use as oxygen transport membrane. The chemical compatibility between both materials depends on the synthesis method, i.e. one-pot sol-gel synthesis leads to the formation of the fluorite and the perovskite phases, as well as a third NiO-based phase. The formation of this last phase can be avoided by previously stabilizing the phases separately. The composite material shows high electrical conductivity, i.e., 7.25 S cm−1 at 800 °C for LCNF-CGO20 with NiO impurity, and 2.6 S cm−1 at 800 °C for LCNF-CGO20. A maximum oxygen flux, J(O2), of 0.74 ml min−1 cm−2 is obtained at 1000 °C for a surface-activated membrane in Air/Ar gradient at ambient pressure. The membranes were tested under i) 30% CO2 in Ar, and ii) 250 ppm of SO2 in 30% CO2 in Ar, reproducing oxyfuel-like conditions. Oxygen flux decreases in these atmospheres, especially at temperatures below 900 °C, due to competitive adsorption of these gases with the O2. After CO2 and SO2 exposure, initial oxygen fluxes are recovered when switching back to Ar sweeping at temperatures above 900 °C. Nevertheless, at temperatures < 900 °C the original J(O2) before SO2 exposure is not fully recovered and postmortem FESEM images reveal the membrane surface degradation in SO2.
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000841285 536__ $$0G:(EU-Grant)608524$$aGREEN-CC - Graded Membranes for Energy Efficient New Generation Carbon Capture Process (608524)$$c608524$$fFP7-ENERGY-2013-1$$x1
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000841285 7001_ $$0P:(DE-Juel1)161336$$aBalaguer, María$$b1
000841285 7001_ $$0P:(DE-Juel1)129587$$aBaumann, Stefan$$b2$$ufzj
000841285 7001_ $$0P:(DE-HGF)0$$aSerra, José M.$$b3$$eCorresponding author
000841285 773__ $$0PERI:(DE-600)1491419-0$$a10.1016/j.memsci.2017.11.006$$gVol. 548, p. 117 - 124$$p117 - 124$$tJournal of membrane science$$v548$$x0376-7388$$y2018
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