Rate determining step in SDC-SSAF dual-phase oxygen permeation membrane

Li, Claudia; Chew, Jiuan Jing; Liu, Shaomin; Zhu, Xuefeng; Sunarso, Jaka

doi:10.1016/j.memsci.2018.12.044

Cited by 31 publications

(24 citation statements)

References 47 publications

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“…These results are similar to previous reports. 44,45 It is important to stress that because of the adequate wettability of the ceramic phase with carbonates, the densification of the membrane by infiltration was successfully reached; as a result, nitrogen leak was not detected during the permeation measurements. The dense ceramic-molten carbonate membrane exhibits high CO 2 and O 2 selectivity; for example, at 950°C, the selectivity estimated based on the ratio of permeance (CO 2 + O 2 )/N 2 is 1342.…”

Section: Co 2 -O 2 Permeation Measurements At High Temperaturesmentioning

confidence: 99%

Concurrent and modulated separation of CO₂ and O₂ by a fluorite/perovskite‐based membrane

Fabián-Anguiano

Ortega-Lugo

Ramírez-Moreno

et al. 2021

Int J Applied Ceramic Tech

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In this paper, it is reported the fabrication of a new dense ceramic-molten carbonate membrane used for the selective separation of carbon dioxide (CO 2 ) and oxygen (O 2 ) at elevated temperatures (850-950°C). First, it was chemically synthesized a fluorite/perovskite ceramic oxide with mixed ionic-electronic conduction properties and general formula Ce 0.9 Pr 0.1 O 2-δ /Pr 0.6 Sr 0.4 Fe 0.5 Co 0.5 O 3-δ (CP-PSFC, 60:40 wt%) by the citrate-ethylene-diamine-tetra acetic acid (EDTA) route. Then, a disk-shaped porous ceramic support partially sintered was infiltrated with a ternary mixture of molten salts of Li 2 CO 3 /Na 2 CO 3 /K 2 CO 3 composition. The permeation measurements at high temperatures suggest a concurrent separation of both species CO 2 and O 2 . The system exhibits high permeance of CO 2 and O 2 by rising to maximum values of 2.17 × 10 −7 and 0.69 × 10 −7 mol m −2 s −1 Pa −1 , respectively at 950°C. Moreover, the possibility of modulating the permeate CO 2 :O 2 ratio is envisaged by changing the fluorite to perovskite proportion in the membrane composition. The stability performance of the obtained membrane was studied under a long-term permeation test. It exhibits a remarkable thermal and chemical stability during 110 h at 875°C. This way, it corroborated the proposed new ceramic phase's excellent properties for the fabrication of supported ceramic-molten carbonate membranes.

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Section: Co 2 -O 2 Permeation Measurements At High Temperaturesmentioning

confidence: 99%

Concurrent and modulated separation of CO₂ and O₂ by a fluorite/perovskite‐based membrane

Fabián-Anguiano

Ortega-Lugo

Ramírez-Moreno

et al. 2021

Int J Applied Ceramic Tech

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“…On the other hand, normal air feed results in two different E a , that is, 126.2 ± 2.1 kJ mol −1 above 800 C and 367.2 kJ mol −1 below 800 C. This change in E a indicates a change in rate limiting step, believed to be from surface exchange reactions limited (between 750 C and 800 C) to bulk diffusion limited (between 800 C and 950 C), similar to the trend previously shown by SDC-SSAF disks. 27 Applying sufficiently high P 0 O 2 will overcome the surface exchange reactions, causing bulk diffusion to be the only limiting mechanism throughout the entire tested temperature range.…”

Section: Characterization and Morphology Of Sdc-ssaf Hollow Fibermentioning

confidence: 99%

“…The oxygen permeation fluxes through these membranes have also been modeled using the Zhu model, which is based on the individual membrane interfacial resistances 24–26 . The oxygen permeation behavior in 0.5‐mm‐thick SDC‐SSAF disks was found to be limited by surface reactions between 800°C and 850°C and bulk diffusion above 875°C 27,28 . Between 850°C and 875°C, there exists a transition region consisting of mixed surface exchange and bulk diffusion influence.…”

Section: Introductionmentioning

confidence: 99%

CO₂‐resistant SDC‐SSAF oxygen selective dual‐phase hollow fiber membranes

Zhang

Meng

et al. 2020

Asia-Pacific J Chem Eng

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Ce 0.85 Sm 0.15 O 1.925-Sm 0.6 Sr 0.4 Al 0.3 Fe 0.7 O 3-δ (SDC-SSAF) hollow fiber membranes aimed for oxyfuel application are fabricated via a phase inversionsintering technique using powders synthesized from EDTA-citrate complex method. Oxygen ions transport is revealed to be the limiting step that determines the overall oxygen transport rate in SDC-SSAF. SDC-SSAF hollow fiber membrane attained a maximum flux of 2.6 ml min −1 cm −2 at 950 C under an oxygen partial pressure difference of 1/0.02 atm (feed/permeate). Variation in oxygen partial pressure on the permeate side exerts larger influence on the oxygen permeation flux relative to the change on the feed side. Stability tests over 100 h demonstrate stable oxygen permeation flux under both He and CO 2 sweep conditions.

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“…Similar selection criteria for the ionic conducting material have to be considered allowing for high electronic conductivity in combination with a high chemical and thermal compatibility [ 4 ]. The above-mentioned factors have made Ce 0.8 Sm 0.2 O 2− δ –Sm 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3− δ (CSO-SSFCO), Ce 0.9 Pr 0.1 O 2− δ –Pr 0.6 Ca 0.4 FeO 3− δ (CPO-PCFO), Ce 0.8 Gd 0.2 O 2− δ –Pr 0.5 Sr 0.5 Fe 0.5 Co 0.5 O 3− δ (CGO-PSFCO), and Ce 0.9 Nd 0.1 O 2− δ –Nd 0.6 Sr 0.4 CoO 3− δ (CNO-NSCO) intensively investigated materials [ 2 , 3 , 4 , 6 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ]. Although the CO 2 resistance has been improved, most of their oxygen permeation fluxes are still too low to meet the requirements for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of 40 wt % Ce0.9Pr0.1O2–δ–60 wt % NdxSr1−xFe0.9Cu0.1O3−δ Dual-Phase Membranes for Efficient Oxygen Separation

et al. 2020

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Dense, H2- and CO2-resistant, oxygen-permeable 40 wt % Ce0.9Pr0.1O2–δ–60 wt % NdxSr1−xFe0.9Cu0.1O3−δdual-phase membranes were prepared in a one-pot process. These Nd-containing dual-phase membranes have up to 60% lower material costs than many classically used dual-phase materials. The Ce0.9Pr0.1O2−δ–Nd0.5Sr0.5Fe0.9Cu0.1O3−δ sample demonstrates outstanding activity and a regenerative ability in the presence of different atmospheres, especially in a reducing atmosphere and pure CO2 atmosphere in comparison with all investigated samples. The oxygen permeation fluxes across a Ce0.9Pr0.1O2−δ–Nd0.5Sr0.5Fe0.9Cu0.1O3−δ membrane reached up to 1.02 mL min−1 cm−2 and 0.63 mL min−1 cm−2 under an air/He and air/CO2 gradient at T = 1223 K, respectively. In addition, a Ce0.9Pr0.1O2–δ–Nd0.5Sr0.5Fe0.9Cu0.1O3–δ membrane (0.65 mm thickness) shows excellent long-term self-healing stability for 125 h. The repeated membrane fabrication delivered oxygen permeation fluxes had a deviation of less than 5%. These results indicate that this highly renewable dual-phase membrane is a potential candidate for long lifetime, high temperature gas separation applications and coupled reaction–separation processes.

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Rate determining step in SDC-SSAF dual-phase oxygen permeation membrane

Cited by 31 publications

References 47 publications

Concurrent and modulated separation of CO₂ and O₂ by a fluorite/perovskite‐based membrane

Concurrent and modulated separation of CO₂ and O₂ by a fluorite/perovskite‐based membrane

CO₂‐resistant SDC‐SSAF oxygen selective dual‐phase hollow fiber membranes

Synthesis and Characterization of 40 wt % Ce0.9Pr0.1O2–δ–60 wt % NdxSr1−xFe0.9Cu0.1O3−δ Dual-Phase Membranes for Efficient Oxygen Separation

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Rate determining step in SDC-SSAF dual-phase oxygen permeation membrane

Cited by 31 publications

References 47 publications

Concurrent and modulated separation of CO2 and O2 by a fluorite/perovskite‐based membrane

Concurrent and modulated separation of CO2 and O2 by a fluorite/perovskite‐based membrane

CO2‐resistant SDC‐SSAF oxygen selective dual‐phase hollow fiber membranes

Synthesis and Characterization of 40 wt % Ce0.9Pr0.1O2–δ–60 wt % NdxSr1−xFe0.9Cu0.1O3−δ Dual-Phase Membranes for Efficient Oxygen Separation

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Product

Resources

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Concurrent and modulated separation of CO₂ and O₂ by a fluorite/perovskite‐based membrane

Concurrent and modulated separation of CO₂ and O₂ by a fluorite/perovskite‐based membrane

CO₂‐resistant SDC‐SSAF oxygen selective dual‐phase hollow fiber membranes