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Exploring the Processing of Tubular Chromite- and Zirconia-Based Oxygen Transport Membranes

机译：探索管状铬铁矿和氧化锆基输氧膜的加工

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Tubular oxygen transport membranes (OTMs) that can be directly integrated in high temperature processes have a large potential to reduce CO2 emissions. However, the challenging processing of these multilayered tubes, combined with strict material stability requirements, has so far hindered such a direct integration. We have investigated if a porous support based on (Y2O3)0.03(ZrO2)0.97 (3YSZ) with a dense composite oxygen membrane consisting of (Y2O3)0.01(Sc2O3)0.10(ZrO2)0.89 (10Sc1YSZ) as an ionic conductor and LaCr0.85Cu0.10Ni0.05O3?δ (LCCN) as an electronic conductor could be fabricated as a tubular component, since these materials would provide outstanding chemical and mechanical stability. Tubular components were made by extrusion, dip coating, and co-sintering, and their chemical and mechanical integrity was evaluated. Sufficient gas permeability (≥10?14 m2) and mechanical strength (≥50 MPa) were achieved with extruded 3YSZ porous support tubes. The high co-sintering temperature required to densify the 10ScYSZ/LCCN membrane on the porous support, however, causes challenges related to the evaporation of chromium from the membrane. This chemical degradation caused loss of the LCCN electronic conducting phase and the formation of secondary lanthanum zirconate compounds and fractures. LCCN is therefore not suitable as the electronic conductor in a tubular OTM, unless means to lower the sintering temperature and reduce the chromium evaporation are found that are applicable to the large-scale fabrication of tubular components.
机译：可以直接集成在高温过程中的管状氧气传输膜（OTM）具有减少CO2排放的巨大潜力。然而，迄今为止，对这些多层管的挑战性加工以及严格的材料稳定性要求阻碍了这种直接集成。我们研究了基于（Y2O3）0.03（ZrO2）0.97（3YSZ）的多孔载体是否具有由（Y2O3）0.01（Sc2O3）0.10（ZrO2）0.89（10Sc1YSZ）作为离子导体和LaCr0组成的致密复合氧膜。可以将85Cu0.10Ni0.05O3Δδ（LCCN）作为电子导体制造为管状组件，因为这些材料将提供出色的化学和机械稳定性。通过挤出，浸涂和共烧结制备管状部件，并评估其化学和机械完整性。使用3YSZ多孔支撑管挤压时，可获得足够的透气性（≥10？14 m2）和机械强度（≥50MPa）。然而，致密化多孔载体上的10ScYSZ / LCCN膜所需的高共烧结温度引起了与铬从膜中蒸发相关的挑战。这种化学降解导致LCCN电子导电相的损失，继而形成锆酸镧镧化合物和断裂。因此，LCCN不适合用作管状OTM中的电子导体，除非找到降低烧结温度并减少铬蒸发的方法，该方法适用于大规模制造管状部件。

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