The impact of sulfur contamination on the performance of La0.6Sr0.4Co0.2Fe0.8O3−δ oxygen transport membranes

Alqaheem, Yousef; Thursfield, Alan; Zhang, Guangru; Metcalfe, Ian S.

doi:10.1016/j.ssi.2014.01.011

Cited by 11 publications

(6 citation statements)

References 15 publications

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“…An evolution of J(O 2 )a safunction of time for the tests corresponding to Figure 5b data is given in the Supporting Information ( Figure S1). [19,[42][43][44] An estimation of E a was also done, which is given in Table 2. a) O 2 permeation of 50:50 NFO/CTO membrane as af unction of CO 2 contentins weeps tream (300 mL min À1 )w hen feeding with synthetic air (100 mL min À1 )ats everal temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…ChemSusChem 2015, 8,4242 -4249 www.chemsuschem.org J(O 2 )i ss till presenting acceptable values (0.09 mL min À1 cm À2 at 850 8C) since O 2 flux is not dropping dramatically or becoming negligible, what is the typical behavior of state-of-the-art O 2 membranes when exposed to sulphur-containinge nvironments. [19,[42][43][44] An estimation of E a was also done, which is given in Table 2. E a values increase when adding SO 2 and CO 2 to the sweep gas on permeate side, owing to stronger limitation in the surfacee xchange.…”

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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“…The XRD analysis showed a peak related to the formation of SrSO4. In another study, an LSCF membrane was exposed to 200 ppm of H2S for 100 h at 900 °C [141]. Again, strontium sulphate was formed with the corresponding decay in the oxygen flux.…”

Section: Sulphur Resistancementioning

confidence: 98%

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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“…Over the past decades, researchers have been engaged in the development of singletype perovskite-related structure oxide OTMs. In fact, these single-type perovskite materials (e.g., Ba 0.5 Sr 0.5 Fe 0.8 Co 0.2 O 3−δ ) possess high ambipolar conductivities accompanying high oxygen permeabilities at high temperatures [8][9][10]. However, most of the single-type perovskite OTMs containing alkali earth metal elements in the A-site, such as Ba, are easy to form a carbonate impurity phase at high temperature under CO 2 atmosphere, which reduces the stability and oxygen permeability of the membranes [10].…”

Section: Introductionmentioning

confidence: 99%

“…However, most of the single-type perovskite OTMs containing alkali earth metal elements in the A-site, such as Ba, are easy to form a carbonate impurity phase at high temperature under CO 2 atmosphere, which reduces the stability and oxygen permeability of the membranes [10]. On the other hand, single-type perovskite OTMs containing Co in the B-site have a large expansion coefficient at high temperatures, which reduces the structural stability of the OTMs [8,11,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Bi Substitution on the Cobalt-Free 60wt.%Ce0.9Pr0.1O2−δ-40wt.%Pr0.6Sr0.4Fe1−xBixO3−δ Oxygen Transport Membranes

et al. 2021

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The mixed ionic-electronic conducting (MIEC) oxygen transport membrane (OTM) can completely selectively penetrate oxygen theoretically and can be widely used in gas separation and oxygen-enriched combustion industries. In this paper, dual-phase MIEC OTMs doped with Bi are successfully prepared by a sol-gel method with high-temperature sintering, whose chemical formulas are 60wt.%Ce0.9Pr0.1O2−δ-40wt.%Pr0.6Sr0.4Fe1−xBixO3−δ (60CPO-40PSF1−xBxO, x = 0.01, 0.025, 0.05, 0.10, 0.15, 0.20). The dual-phase structure, element content, surface morphology, oxygen permeability, and stability are studied by XRD, EDXS, SEM, and self-built devices, respectively. The optimal Bi-doped component is 60wt.%Ce0.9Pr0.1O2−δ-40wt.%Pr0.6Sr0.4Fe0.99Bi0.01O3−δ, which can maintain 0.71 and 0.62 mL·min−1·cm−2 over 50 h under He and CO2 atmospheres, respectively. The oxygen permeation flux through these Bi-doped OTMs under air/CO2 gradient is 12.7% less than that under air/He gradient, which indicates that the Bi-doped OTMs have comparable oxygen permeability and excellent CO2 tolerance.

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The impact of sulfur contamination on the performance of La0.6Sr0.4Co0.2Fe0.8O3−δ oxygen transport membranes

Abstract: IS. The impact of sulfur contamination on the performance of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (-) δ oxygen transport membranes.

Cited by 11 publications

References 15 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

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

Effects of Bi Substitution on the Cobalt-Free 60wt.%Ce0.9Pr0.1O2−δ-40wt.%Pr0.6Sr0.4Fe1−xBixO3−δ Oxygen Transport Membranes

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