La0.6Sr0.4Co0.2Fe0.8O3−δ microtubular membranes for hydrogen production from water splitting

Franca, Rafael Vilar; Thursfield, Alan; Metcalfe, Ian S.

doi:10.1016/j.memsci.2011.10.027

Cited by 48 publications

(25 citation statements)

References 24 publications

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“…Water thermolysis on mixed ionic-electronic conductive (MIEC) membranes with oxygen permeability have been demonstrated. [9][10][11][12][13][14][15][16] For a water thermolysis membrane reactor, there are no moving components or electronic circuits; therefore, less maintenance is expected compared to electrolysis or chemical looping systems. Yet life-cycle economic analysis should be carried out to compare these systems in further studies.…”

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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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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“…In addition, oxide anion transport membranes at 1400e1800 C have been used to move equilibrium to produce more hydrogen (Franca, Thursfield, & Metcalfe, 2012). After that, mixed oxygen ion and electron-conducting oxide anion transport membranes were used and water splitting was coupled with other reactions to decrease the operating temperature of the process.…”

Section: Membrane Reactor For Water Splitting Reactionmentioning

confidence: 99%

Butene oligomerization, phenol synthesis from benzene, butane partial oxidation, and other reactions carried out in membrane reactors

Rahimpour

2015

Membrane Reactors for Energy Applications and Basic Chemical Production

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“…It should possess excellent properties, including enough reactivity, high oxygen transfer capacity, low production cost, environmental friendliness, and a low tendency of fragmentation and attrition [8][9][10]. The main materials used as OCs are transition metal oxides, such as Mn3O4, Fe2O3, NiO, CuO, and CoO [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of the Interactions between Fe2O3/Al2O3 and CO

Liang

Chen

2017

Energies

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Abstract:The behavior of Fe 2 O 3 /Al 2 O 3 particles as oxygen carriers (OCs) for CO chemical looping combustion (CLC) under different reaction temperatures (700 • C, 800 • C, 900 • C, and 1000 • C) were tested in a lab-scale fluidized bed and a thermogravimetric analysis (TGA) unit. The results show that the oxygen carrier presents the highest reactivity at 800 • C, even after 30 cycles of redox reaction in a fluidized bed, while more obvious carbon deposition occurred for the case at 700 • C, and agglomeration for the case at 1000 • C. Moreover, the detailed behavior of the prepared Fe 2 O 3 /Al 2 O 3 particle was detected in the TGA apparatus at different reaction temperatures. Furthermore, temperature-programming TGA experiments were performed to investigate the influence of different CO concentrations and CO/CO 2 concentrations on the reaction between CO and OC during the chemical looping combustion processes. Based on these experimental behaviors of the prepared Fe 2 O 3 /Al 2 O 3 during the CLC of CO, the detailed models and electronic properties of the pure and reduced Fe 2 O 3 /Al 2 O 3 supported the slabs, CO adsorption, and oxidation, and the decomposition reactions on these surfaces were revealed using density functional theory (DFT) calculations which went deep into the nature of the synergetic effect of the support of Al 2 O 3 on the activity of Fe 2 O 3 for the CLC of CO.

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La0.6Sr0.4Co0.2Fe0.8O3−δ microtubular membranes for hydrogen production from water splitting

Cited by 48 publications

References 24 publications

Toward enhanced hydrogen generation from water using oxygen permeating LCF membranes

Toward enhanced hydrogen generation from water using oxygen permeating LCF membranes

Butene oligomerization, phenol synthesis from benzene, butane partial oxidation, and other reactions carried out in membrane reactors

Experimental and Theoretical Study of the Interactions between Fe2O3/Al2O3 and CO

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