Evaluation of thin film ceria membranes for syngas membrane reactors—Preparation, characterization and testing

Kaiser, Andreas; Foghmoes, Søren Preben Vagn; Chatzichristodoulou, Christodoulos; Søgaard, Martin; Glasscock, Julie; Frandsen, Henrik Lund; Hendriksen, Peter Vang

doi:10.1016/j.memsci.2010.12.012

Cited by 49 publications

(44 citation statements)

References 26 publications

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“…However, the oxygen permeation ux is lower than that for the industrial application requirement (1 cm 3 min À1 cm À2 ). 43 In future, further research is needed to improve the oxygen ux of this dual phase membrane by doping as well by technical measures such as asymmetric membrane structures 12,44,45 or by surface enlargement as demonstrated for a hollow bre structure. 46 …”

Section: Discussionmentioning

confidence: 99%

A CO₂-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO₂capture

et al. 2014

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We report a novel CO 2 -stable reduction-tolerant dual-phase oxygen transport membrane 40 wt% Nd 0.6 Sr 0.4 FeO 3Àd -60 wt% Ce 0.9 Nd 0.1 O 2Àd (40NSFO-60CNO), which was successfully developed by a facile one-pot EDTA-citric sol-gel method. The microstructure of the crystalline 40NSFO-60CNO phase was investigated by combined in situ X-ray diffraction (XRD), scanning electron microscopy (SEM), back scattered SEM (BSEM), and energy dispersive X-ray spectroscopy (EDXS) analyses. Oxygen permeation and long-time stability under CO 2 and CH 4 atmospheres were investigated. A stable oxygen flux of 0.21 cm 3 min À1 cm À2 at 950 C with undiluted CO 2 as sweep gas is found which is increased to 0.48 cm 3 min À1 cm À2 if the air side is coated with a porous La 0.6 Sr 0.4 CoO 3Àd (LSC) layer. All the experimental results demonstrate that the 40NSFO-60CNO not only shows good reversibility of the oxygen permeation fluxes upon temperature cycling, but also good phase stability in a CO 2 atmosphere and under the harsh conditions of partial oxidation of methane to synthesis gas up to 950 C.

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Section: Discussionmentioning

confidence: 99%

A CO₂-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO₂capture

et al. 2014

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“…Gd-, Sm-doped ceria) is used as ionic conducting thin film layer in intermediate temperature solid oxide fuel cells (IT SOFCs) 1,2 or is investigated for novel applications, such as electrochemical flue gas purification devices 3 or oxygen transport membranes. [4][5][6][7] Recently, the highest mixed conducting oxygen flux ever reported on a fluorite type material 4,5 was shown under syngas conditions in oxygen transport membranes (OTM) on an asymmetric supported Ce 0.9 Gd 0.1 O 1.95−δ (CGO) thin film membrane. CGO membranes were also considered for other membrane reactor applications with harsh reducing conditions and impurities, such as oxidative coupling of methane.…”

Section: Introductionmentioning

confidence: 99%

“…layer, supported by a porous ceramic 6 or CERMET substrate 4 to achieve the commercially required high oxygen fluxes.…”

Section: Introductionmentioning

confidence: 99%

Sintering process optimization for multi-layer CGO membranes by in situ techniques

Kaiser

Prasad

Foghmoes

et al. 2013

Journal of the European Ceramic Society

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“…3,7 Kaiser et al 8 reported that the oxygen permeation flux of a 27 μm asymmetric 10 at.% Gd-doped ceria-based membrane exceeds 10 ml cm −2 min −1 under a gradient of air/H 2 at 850…”

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Ionic/Electronic Conductivity, Thermal/Chemical Expansion and Oxygen Permeation in Pr and Gd Co-Doped Ceria Pr_xGd_0.1Ce_0.9-xO_1.95-δ

Cheng

Chatzichristodoulou

Søgaard

et al. 2017

J. Electrochem. Soc.

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The oxygen permeation flux of Ce 0.9 Gd 0.1 O 1.95-δ (CGO)-based oxygen transport membranes under oxidizing conditions is limited by the electronic conductivity of the material. This work aims to enhance the bulk ambipolar conductivity of CGO by partial substitution of Ce with the redox active element Pr. A series of compositions of Pr x Gd 0.1 Ce 0.9-x O 1.95-δ (x = 0, 0.02, 0.05, 0.08, 0.15, 0.25, 0.3 and 0.4) was prepared by solid state reaction. X-ray powder diffraction (XPD) indicates that Pr is completely dissolved in the fluorite structure up to 40 at.%. Pronounced nonlinear thermal expansion behavior was observed as a function of temperature, due to the simultaneous contributions of both thermal and chemical expansion. The electronic and ionic conductivities were measured as a function of temperature and oxygen partial pressure. Within the range from 10 to 15 at.% Pr, a drastic drop of the activation energy of the hole mobility and an abrupt increase of the hole conductivity at low temperature was observed. The behavior could be rationalized by a simple percolation model. Oxygen permeation fluxes through disk shaped samples fed with air on one side and N 2 on the other side were also measured. The oxygen flux through Pr 0.05 Gd 0.1 Ce 0.85 O 1.95-δ was higher than that for CGO by one order of magnitude owing to the enhanced electronic conductivity albeit the flux is still limited by the electronic conductivity. In terms of the electronic and ionic conductivity, the estimated maximum oxygen permeation flux of a 10 μm Pr 0.4 Gd 0.1 Ce 0.9 O 1.95-δ -based membrane exceeds 10 Nml cm −2 min −1 at 900 • C under a small oxygen potential gradient (0.21/10 −3 bar) which is promising for use in oxygen production and in oxy-fuel combustion. Also the material may be well applicable to SOFC/SOEC composite electrodes where mixed conductivity is also desirable. Dense ceramic oxygen transport membranes (OTMs) could potentially be applied for production of high purity oxygen for medical purposes, supply of oxygen in the steel industry, oxy-fuel combustion schemes, as well as in the cement and glass industries. Also, importantly, OTMs can beneficially be integrated with a biomass gasifier, allowing production of syngas (CO and H 2 ), which is a precursor for a variety of high value chemicals. 1 Besides being applicable for OTMs, 2 acceptor doped-ceria has been intensively studied for use in a number of other applications e.g. solid oxide fuel cells (SOFCs), 3 solid oxide electrolysis cells (SOECs) 4 and for electrocatalysis. 5 In particular, acceptor doped ceria (e.g. CGO) is interesting owing to high oxide ion conductivity (0.12 Scm −1 for Gd 0.1 Ce 0.9 O 1.95-δ at 900• C 6 ), appreciable electrocatalytic activity, high electronic conductivity under reducing conditions, and excellent chemical stability under harsh reducing and even corrosive gaseous conditions. 3,7 Kaiser et al. 8 reported that the oxygen permeation flux of a 27 μm asymmetric 10 at.% Gd-doped ceria-based membrane exceeds 10 ml cm −2 min −1 under a gradie...

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Evaluation of thin film ceria membranes for syngas membrane reactors—Preparation, characterization and testing

Cited by 49 publications

References 26 publications

A CO₂-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO₂capture

A CO₂-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO₂capture

Sintering process optimization for multi-layer CGO membranes by in situ techniques

Ionic/Electronic Conductivity, Thermal/Chemical Expansion and Oxygen Permeation in Pr and Gd Co-Doped Ceria Pr_xGd_0.1Ce_0.9-xO_1.95-δ

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Evaluation of thin film ceria membranes for syngas membrane reactors—Preparation, characterization and testing

Cited by 49 publications

References 26 publications

A CO2-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO2capture

A CO2-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO2capture

Sintering process optimization for multi-layer CGO membranes by in situ techniques

Ionic/Electronic Conductivity, Thermal/Chemical Expansion and Oxygen Permeation in Pr and Gd Co-Doped Ceria PrxGd0.1Ce0.9-xO1.95-δ

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A CO₂-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO₂capture

A CO₂-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO₂capture

Ionic/Electronic Conductivity, Thermal/Chemical Expansion and Oxygen Permeation in Pr and Gd Co-Doped Ceria Pr_xGd_0.1Ce_0.9-xO_1.95-δ