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Dual-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
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.memsci.2017.11.006
Julio Garcia-Fayos , María Balaguer , Stefan Baumann , José M. Serra

Abstract A 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

中文翻译:

基于 LaCo 0.2 Ni 0.4 Fe 0.4 O 3-x -Ce 0.8 Gd 0.2 O 2-x 成分的双相膜,用于在富含 CO 2 /SO 2 的气体环境下进行氧气渗透

摘要 提出了一种以钙钛矿LaCo0.2Ni0.4Fe0.4O3-δ(LCNF)为电子相,萤石Ce0.8Gd0.2O2-δ(CGO20)为氧离子导体的高双极性双相材料。用作氧传输膜。两种材料之间的化学相容性取决于合成方法,即一锅溶胶-凝胶合成导致萤石和钙钛矿相以及第三个基于 NiO 的相的形成。通过预先单独稳定这些相可以避免最后一相的形成。该复合材料显示出高电导率,即 800°C 下具有 NiO 杂质的 LCNF-CGO20 为 7.25 S cm-1,LCNF-CGO20 在 800°C 下为 2.6 S cm-1。最大氧气通量 J(O2) 为 0。74 ml min-1 cm-2 在 1000 °C 下在空气/Ar 梯度中的表面活化膜在环境压力下获得。膜在 i) 30% CO2 的 Ar 和 ii) 250 ppm SO2 和 30% CO2 的 Ar 下进行测试,再现类似氧燃料的条件。由于这些气体与 O2 的竞争吸附,这些大气中的氧通量会降低,尤其是在低于 900 °C 的温度下。在 CO2 和 SO2 暴露后,在 900 °C 以上的温度下切换回 Ar 吹扫时,初始氧通量会恢复。尽管如此,在温度 在 900 °C 以上的温度下切换回 Ar 吹扫时,初始氧通量会恢复。尽管如此,在温度 在 900 °C 以上的温度下切换回 Ar 吹扫时,初始氧通量会恢复。尽管如此,在温度
更新日期:2018-02-01
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