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Abstract
An original asymmetric tubular membrane for oxygen production applications was manufactured in a two-step process. A 3 mol% Y2O3 stabilized ZrO2 (3YSZ) porous tubular support was manufactured by the freeze-casting technique, offering a hierarchical and radial-oriented porosity of about 15 µm in width, separated by fully densified walls of about 2 µm thick, suggesting low pressure drop and boosted gas transport. The external surface of the support was successively dip-coated to get a Ce0.8Gd0.2O2−δ – 5mol%Co (CGO-Co) interlayer of 80 µm in thickness and an outer dense layer of La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) with a thickness of 30 µm. The whole tubular membrane presents both uniform geometric characteristics and microstructure all along its length. Chemical reactivity between each layer was studied by coupling X-Ray Diffraction (XRD) analysis and Energy Dispersive X-Ray spectroscopy (EDX) mapping at each step of the manufacturing process. Cation interdiffusion between different phases was discarded, confirming the compatibility of this tri-layer asymmetric ceramic membrane for oxygen production purposes. For the first time, a freeze-cast tubular membrane has been evaluated for oxygen permeation, exhibiting a value of 0.31 mL·min−1·cm−2 at 1000 °C under air and argon as feed and sweep gases, respectively. Finally, under the same conditions and increasing the oxygen partial pressure to get pure oxygen as feed, the oxygen permeation reached 1.07 mL·min−1·cm−2.
Highlights
Sustainable production of pure oxygen is one of the most relevant challenges for environmental and industrial purposes
Both processes have been widely studied and improved, but the large size of the industrial complex needed for cryogenic distillation and the low purity of the oxygen produced by PressureSwing Adsorption (PSA) are a drawback for the implementation of small scale applications [1]
MIEC (Mixed Ionic and Electronic Conductors) membranes operating at high temperature offer higher energy efficiency and lower production costs than state-of-the-art technologies, establishing them as a suitable alternative for industrial oxygen production
Summary
Sustainable production of pure oxygen is one of the most relevant challenges for environmental and industrial purposes. Both processes have been widely studied and improved, but the large size of the industrial complex needed for cryogenic distillation and the low purity of the oxygen produced by PSA are a drawback for the implementation of small scale applications [1]. Several research groups are devoted to the improvement of this technology for an up-scaling to industry, where the most effective configuration to date is composed by a porous ceramic support covered by a thin dense layer of a MIEC material. This dense layer acts as a sieve that will segregate the oxygen from the rest of constituents in air
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