Oxygen permeation and coal-gas-assisted hydrogen production using oxygen transport membranes

Park, C.Y.; Lee, T.H.; Dorris, S. E.; Lu, Yao; Balachandran, U.

doi:10.1016/j.ijhydene.2011.04.090

Cited by 28 publications

(13 citation statements)

References 23 publications

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“…As expected, a BSCF/ 40 vol.% Ag disk polished down to z0.33 mm achieves more than two times higher oxygen flux than that of a z0.84 mm-thick disk at 600 C. The apparent activation energies (E a ) for the BSCF/Ag composites were calculated from the slopes of the data in Fig. 4 and found to be in the range of 0.52e0.81 eV, lower than the values of E a ¼ 1.15e1.35 eV reported for LSCF [19].…”

Section: Oxygen Permeabilitymentioning

confidence: 79%

“…The oxygen permeation flux was measured by sealing polished disks to the end of an Al 2 O 3 tube with a spring-loaded assembly [19]. A schematic diagram of the membrane reactor can be found in our previous reports [20e22].…”

Section: Oxygen Permeation Measurementsmentioning

confidence: 99%

“…The solid line indicates oxygen permeation flux of the reference, La 0.7 Sr 0.3 Cu 0.2 Fe 0.8 O 3Àd (LSCF) thin film[19].…”

mentioning

confidence: 99%

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Ethanol reforming using Ba0.5Sr0.5Cu0.2Fe0.8O3−δ/Ag composites as oxygen transport membranes

Park

Lee

Dorris

et al. 2012

Journal of Power Sources

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Section: Oxygen Permeabilitymentioning

confidence: 79%

Section: Oxygen Permeation Measurementsmentioning

confidence: 99%

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Ethanol reforming using Ba0.5Sr0.5Cu0.2Fe0.8O3−δ/Ag composites as oxygen transport membranes

Park

Lee

Dorris

et al. 2012

Journal of Power Sources

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“…However, high performance Ba and Co containing perovskites often suffers from degradation such as carbonate formation or cobalt segregation, respectively . Phase segregation, pores as well as surface morphology changes have also been observed during water thermolysis.…”

Section: Introductionmentioning

confidence: 99%

Enhancing co‐production of H₂ and syngas via water splitting and POM on surface‐modified oxygen permeable membranes

Ghoniem

Uddi

2016

AIChE Journal

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In this paper, we report a detailed study on co-production of H 2 and syngas on La 0.9 Ca 0.1 FeO 3-δ (LCF-91) membranes via water splitting and partial oxidation of methane (POM), respectively. A permeation model shows that the surface reaction on the sweep side is the rate limiting step for this process on a 0.9 mm-thick dense membrane at 990 o C. Hence, sweep side surface modifications such as adding a porous layer and nickel catalysts were applied; the hydrogen production rate from water thermolysis is enhanced by two orders of magnitude to 0.37 μmol/cm 2 •s compared with the results on the unmodified membrane. At the sweep side exit, syngas (H 2 /CO = 2) is produced and negligible solid carbon is found. Yet near the membrane surface on the sweep side, methane can decompose into solid carbon and hydrogen at the surface, or it may be oxidized into CO and CO 2 , depending on the oxygen permeation flux.

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“…When water serves as the oxygen source, its thermolysis occurs on the membrane surface and hydrogen can be produced. The concept has been demonstrated using different MIEC perovskite membranes, i.e., La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3Àd , 11 SrCo 0.4 Fe 0.5 Zr 0.1 O 3Àd , 13 BaCo x Fe y Zr 1ÀxÀy O 3Àd 15 and La 0.7 Sr 0.3 Cu 0.2 -Fe 0.8 O 3Àd , 22 but the mechanism is not well understood. Most of the studies used fuel, such as hydrogen and carbon monoxide to facilitate oxygen permeation through the membrane; as a result, oxygen fluxes in the range of 0.02-3.5 mmol cm À2 s À1 were reported.…”

Section: Introductionmentioning

confidence: 99%

Toward enhanced hydrogen generation from water using oxygen permeating LCF membranes

Chang

Uddi

et al. 2015

Phys. Chem. Chem. Phys.

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Hydrogen production from water thermolysis can be enhanced by the use of perovskite-type mixed ionic and electronic conducting (MIEC) membranes, through which oxygen permeation is driven by a chemical potential gradient. In this work, water thermolysis experiments were performed using 0.9 mm thick La0.9Ca0.1FeO3-δ (LCF-91) perovskite membranes at 990 °C in a lab-scale button-cell reactor. We examined the effects of the operating conditions such as the gas species concentrations and flow rates on the feed and sweep sides on the water thermolysis rate and oxygen flux. A single step reaction mechanism is proposed for surface reactions, and three-resistance permeation models are derived. Results show that water thermolysis is facilitated by the LCF-91 membrane especially when a fuel is added to the sweep gas. Increasing the gas flow rate and water concentration on the feed side or the hydrogen concentration on the sweep side enhances the hydrogen production rate. In this work, hydrogen is used as the fuel by construction, so that a single-step surface reaction mechanism can be developed and water thermolysis rate parameters can be derived. Both surface reaction rate parameters for oxygen incorporation/dissociation and hydrogen-oxygen reactions are fitted at 990 °C. We compare the oxygen fluxes in water thermolysis and air separation experiments, and identify different limiting steps in the processes involving various oxygen sources and sweep gases for this 0.9 mm thick LCF-91 membrane. In the air feed-inert sweep case, the bulk diffusion and sweep side surface reaction are the two limiting steps. In the water feed-inert sweep case, surface reaction on the feed side dominates the oxygen permeation process. Yet in the water feed-fuel sweep case, surface reactions on both the feed and sweep sides are rate determining when hydrogen concentration in the sweep side is in the range of 1-5 vol%. Furthermore, long term studies show that the surface morphology changes and silica impurities have little impact on the oxygen flux for either water thermolysis or air separation.

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Oxygen permeation and coal-gas-assisted hydrogen production using oxygen transport membranes

Cited by 28 publications

References 23 publications

Ethanol reforming using Ba0.5Sr0.5Cu0.2Fe0.8O3−δ/Ag composites as oxygen transport membranes

Ethanol reforming using Ba0.5Sr0.5Cu0.2Fe0.8O3−δ/Ag composites as oxygen transport membranes

Enhancing co‐production of H₂ and syngas via water splitting and POM on surface‐modified oxygen permeable membranes

Toward enhanced hydrogen generation from water using oxygen permeating LCF membranes

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Oxygen permeation and coal-gas-assisted hydrogen production using oxygen transport membranes

Cited by 28 publications

References 23 publications

Ethanol reforming using Ba0.5Sr0.5Cu0.2Fe0.8O3−δ/Ag composites as oxygen transport membranes

Ethanol reforming using Ba0.5Sr0.5Cu0.2Fe0.8O3−δ/Ag composites as oxygen transport membranes

Enhancing co‐production of H2 and syngas via water splitting and POM on surface‐modified oxygen permeable membranes

Toward enhanced hydrogen generation from water using oxygen permeating LCF membranes

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Enhancing co‐production of H₂ and syngas via water splitting and POM on surface‐modified oxygen permeable membranes