Oxygen permeation properties of BSCF5582 tubular membrane fabricated by the slip casting method

Choi, Min Sun; Lim, Dae‐Kwang; Jeon, Sang-Yun; Kim, H.-S.; Song, Sun-Ju

doi:10.1016/j.ceramint.2011.10.012

Cited by 17 publications

(6 citation statements)

References 25 publications

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“…When the charge-carrier transport through the membrane interior dominates, [37,38] the ambipolar conductivity of the composites at 1000 and 950 8C (Figure 4b)c an been determined based on the equation: 2 are the oxygen partial pressuresa tf eed and sweep side, respectively, L is the membrane thickness in cm, F is Faraday's constant, T is temperature in K, and J(O 2 )i s the O 2 permeation expressed in mol s À1 cm À2 .A sc an be seen in Figure 4b, s amb increases with CTOc ontent, confirming that ionic conductivity is limiting the O 2 permeation for CTO-NFO composites. When the charge-carrier transport through the membrane interior dominates, [37,38] the ambipolar conductivity of the composites at 1000 and 950 8C (Figure 4b)c an been determined based on the equation: 2 are the oxygen partial pressuresa tf eed and sweep side, respectively, L is the membrane thickness in cm, F is Faraday's constant, T is temperature in K, and J(O 2 )i s the O 2 permeation expressed in mol s À1 cm À2 .A sc an be seen in Figure 4b, s amb increases with CTOc ontent, confirming that ionic conductivity is limiting the O 2 permeation for CTO-NFO composites.…”

Section: Resultsmentioning

confidence: 99%

“…The three composite membranes were also tested under different pO 2 gradients (i.e.,v ariation of pO 2 in feed and sweep chambers) at different temperatures. When the charge-carrier transport through the membrane interior dominates, [37,38] the ambipolar conductivity of the composites at 1000 and 950 8C (Figure 4b)c an been determined based on the equation: where pO 0 2 and pO 00 2 are the oxygen partial pressuresa tf eed and sweep side, respectively, L is the membrane thickness in cm, F is Faraday's constant, T is temperature in K, and J(O 2 )i s the O 2 permeation expressed in mol s À1 cm À2 .A sc an be seen in Figure 4b, s amb increases with CTOc ontent, confirming that ionic conductivity is limiting the O 2 permeation for CTO-NFO composites. Thus, higher O 2 fluxesa re obtained when the ratio of spinel/fluorite is lowered given that the spinel phase percolates through the membrane thickness.…”

Section: Sem Analysis (mentioning

confidence: 99%

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Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

2015

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Dual-phase membranes are appealing candidates for oxygen transport membranes owing to their unique combination of ambipolar electron-ion transport and endurance. However, O2 separation in industrial environments demands very high stability and effectiveness in the presence of CO2- and SO2-bearing process gases. Here, the composition of dual-phase membranes based on NiFe2O4-Ce(0.8) Tb(0.2)O(2-δ) (NFO-CTO) was optimized and the effective performance of catalytically-activated membranes was assessed in presence of CO2 and SO2. Further insight into the limiting mechanisms in the permeation was gained through electrical conductivity studies, permeation testing in several conditions and impedance spectroscopy analysis. The dual-phase membranes were prepared by one-pot sol-gel method and their permeability increases with increasing fluorite content. An O2 flux of 0.25 (ml min(-1) cm(-2)) mm at 1000 °C was obtained for a thick self-standing membrane with 40:60 NFO/CTO composition. An in-depth study mimicking typical harsh conditions encountered in oxyfuel flue gases was performed on a 50:50 NFO/CTO membrane. CO2 content as well as SO2 presence in the sweep gas stream were evaluated in terms of O2 permeation. O2 fluxes of 0.13 and 0.09 mL min(-1) cm(-2) at 850 °C were obtained for a 0.59 mm thick membrane under CO2 and 250 ppm SO2 in CO2 sweep conditions, respectively. Extended periods at work under CO2- and SO2-containing atmospheres revealed good permeation stability over time. Additionally, XRD, backscattered electrons detector (BSD)-SEM, and energy-dispersive X-ray spectroscopy (EDS) analysis of the spent membrane confirmed material stability upon prolonged exposure to SO2.

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Section: Resultsmentioning

confidence: 99%

Section: Sem Analysis (mentioning

confidence: 99%

Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

2015

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“…Typically, tubular porous substrates are prepared by extrusion [9] [10], slip casting [11], centrifugal casting [12], or isostatic pressing [13]. However, these techniques rely on increasing the total pore volume and pore size to achieve the required permeability at the expense of mechanical properties.…”

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confidence: 99%

Fabrication of ice-templated tubes by rotational freezing: Microstructure, strength, and permeability

Seuba

Leloup

Richaud

et al. 2017

Journal of the European Ceramic Society

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We demonstrate a facile and scalable technique, rotational freezing, to produce porous tubular ceramic supports with radially aligned porosity. The method is based on a conventional ice-templating process in a rotatory mold and demonstrated here with yttria-stabilized zirconia (YSZ). We investigated the effects of solid loading, freezing temperature, and volume of the slurry on the microstructure, strength (o-ring test and four-point bending), and air permeability. The results show that pore volume and pore size can be controlled by the solid loading and freezing temperature respectively, and overall tube thickness can be adjusted by the volume of slurry initially poured into the mold. Decreasing pore size and pore volume increases the mechanical properties but decreases the air permeability. These tubes could be particularly interesting as tubular membrane supports such as oxygen transport membranes.

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“…On the other hand, slip casting method, which is a well-known traditional technique for fabricating ceramic forms with complex shapes, may offer additional advantages. The membrane tubes fabricated by the slip casting method exhibit good compositional homogeneity and a wide range of compositions can be prepared over in a relatively simple manner [14,30]. And due to the less equipment requirement, the slip casting method is cheaper than other techniques.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of dense BaCo0.7Fe0.2Nb0.1O3−δ tubular membrane by slip casting techniques

Zhang

Zeng

et al. 2015

Ceramics International

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Oxygen permeation properties of BSCF5582 tubular membrane fabricated by the slip casting method

Cited by 17 publications

References 25 publications

Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

Dual‐Phase Oxygen Transport Membranes for Stable Operation in Environments Containing Carbon Dioxide and Sulfur Dioxide

Fabrication of ice-templated tubes by rotational freezing: Microstructure, strength, and permeability

Fabrication and characterization of dense BaCo0.7Fe0.2Nb0.1O3−δ tubular membrane by slip casting techniques

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