Fabrication and performance of a tubular ceria based oxygen transport membrane on a low cost MgO support

Ramachandran, Dhavanesan Kothanda; Søgaard, Martin; Clemens, Frank; Gurauskis, Jonas; Kaiser, Andreas

doi:10.1016/j.seppur.2015.02.037

Cited by 23 publications

(13 citation statements)

References 31 publications

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“…Since the temperature required to densify the LCCN/10Sc1YSZ membrane was higher than expected (>1400 °C), and the membrane supports are quite dense and more than strong enough at 1400 °C, higher amounts of pore formers than 61.5 and 64.3 vol % could be considered to retain high gas permeability too after sintering at >>1400 °C. The strength of our 3YSZ tubes ( Table 2) is similar to previously reported planar 3YSZ porous supports (~150 MPa at 45% porosity and ~100 MPa at 55% porosity) [19], twice as strong as porous MgO tubes (82 MPa at 42% porosity) [33], and more than four times as strong as porous BSCF tubes (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36) MPa at 41% porosity) [6]. The gas permeability of the 3YSZ tubes is at the same time improved by an order of magnitude compared to those of MgO (4.7 × 10 −16 m 2 ) at similar porosity (42%) [33].…”

Section: Ceramic Processing Of 3ysz Porous Support Tubessupporting

confidence: 87%

“…Tubular membranes have advantages compared to planar, such as easier sealing and higher tolerance for thermal gradients [15]. Pilot-scale stand-alone units for oxygen production using tubular BSCF under compressed air/vacuum have already been made [16,20,21], and there are a few reports on the lab-scale fabrication and testing of other tubular OTM systems [22][23][24]; as it stands, tubular membranes with thermochemical stability allowing direct integration have not yet been made. Techniques to make flat and defect-free planar OTMs, such as stress relief through bending (camber), top loads for controlling this camber, two-step sintering, and enclosed crucibles or sacrificial powder beds [13,25], are not easily transferrable to large-scale processing of tubular systems.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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Tubular oxygen transport membranes (OTMs) that can be directly integrated in high temperature processes have a large potential to reduce CO 2 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 (Y 2 O 3 ) 0.03 (ZrO 2 ) 0.97 (3YSZ) with a dense composite oxygen membrane consisting of (Y 2 O 3 ) 0.01 (Sc 2 O 3 ) 0.10 (ZrO 2 ) 0.89 (10Sc1YSZ) as an ionic conductor and LaCr 0.85 Cu 0.10 Ni 0.05 O 3−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 m 2 ) 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.

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Section: Ceramic Processing Of 3ysz Porous Support Tubessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…In fact, the oxygen permeation rate in MIEC membranes is controlled by two different mechanisms, such as ionic transport within the membrane and surface membrane exchange. When the permeation process is controlled by bulk diffusion, the oxygen permeate flux will increase when decreasing the thickness of the membrane [25,26]. Membranes with a thickness in the order of 400 to 500 μm is, however, sufficiently small, because the surface exchange rate becomes limiting for smaller membrane thicknesses, as shown in Figure 1 [27].…”

Section: Introductionmentioning

confidence: 99%

“…An oxygen selective layer supported onto a porous substrate is the simplest example of an asymmetric membrane structure. Additional layers with specific functions can be added, like a surface activation layer and/or a catalytic layer, to improve and extend the performance of the membranes, which also increases the complexity of the membrane structure (see Figure 2) [26,30]. While several articles have been published on self-supported MIEC oxygen transport membranes, only a limited number of articles were published on the production and testing of asymmetric membranes.…”

Section: Introductionmentioning

confidence: 99%

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

et al. 2019

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Mixed ionic-electronic conducting membranes have seen significant progress over the last 25 years as efficient ways to obtain oxygen separation from air and for their integration in chemical production systems where pure oxygen in small amounts is needed. Perovskite materials are the most employed materials for membrane preparation. However, they have poor phase stability and are prone to poisoning when subjected to CO2 and SO2, which limits their industrial application. To solve this, the so-called dual-phase membranes are attracting greater attention. In this review, recent advances on self-supported and supported oxygen membranes and factors that affect the oxygen permeation and membrane stability are presented. Possible ways for further improvements that can be pursued to increase the oxygen permeation rate are also indicated. Lastly, an overview of the most relevant examples of membrane reactors in which oxygen membranes have been integrated are provided.

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“…Porous ceramic supports are key components in asymmetric, inorganic membranes. 1,2 Oxygen transport membranes for example, only reach sufficiently high performance when used as thin, dense membranes supported on thicker, gas-permeable macroporous supports. 3,4 Their fabrication should be suitable for large volumes, also in non-planar shapes such as tubes.…”

Section: Introductionmentioning

confidence: 99%

MgO as a non-pyrolyzable pore former in porous membrane supports

Haugen

Geffroy²,

Kaiser

et al. 2018

Journal of the European Ceramic Society

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The gas permeability of Y0.03Zr0.97O2 (3Y-TZP) porous supports from thermoplastic feedstocks has been improved by adding MgO as a non-pyrolyzable pore former. Common pyrolyzable pore formers such as graphite often produce tortuous and narrow pore channels with low gas permeability, limiting the performance of oxygen transport membranes or other membranes relying on gas transport to the active membrane surface. Thermoplastic feedstocks for extrusion of tubular 3Y-TZP supports were prepared with four different amounts of pyrolyzable pore formers and/or MgO as non-pyrolyzable pore former. The MgO was removed after sintering by leaching in acetic acid. With this technique we obtained porosities above 70 vol% and gas permeabilities above 3•10-14 m 2. Compared to samples with only pyrolyzable pore formers, the non-pyrolyzable pore former increases the gas permeability and reduces the tortuosity.

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Fabrication and performance of a tubular ceria based oxygen transport membrane on a low cost MgO support

Cited by 23 publications

References 31 publications

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

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

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

MgO as a non-pyrolyzable pore former in porous membrane supports

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