Production of pure oxygen from BSCF hollow fiber membranes using steam sweep

Leo, Adrian; Liu, Shaomin; Costa, João C. Diniz da

doi:10.1016/j.seppur.2011.02.006

Cited by 34 publications

(19 citation statements)

References 56 publications

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“…2 These patterns confirm that the rich carbon porogenic agent has not affected the crystal structure in the sintered porous substrate. This is an important point as the combustion of activated carbon embedded in the perovskite matrix during calcination in air at high temperatures generated CO 2 , which has the propensity to form carbonates [43][44][45], thus affecting the BSCF structure. This is not the case in this work as no secondary phases containing metal oxides were observed in the XRD patterns.…”

Section: Resultsmentioning

confidence: 99%

Influence of porous structures on O 2 flux of BSCF asymmetric membranes

Rachadel

Motuzas²,

Machado

et al. 2017

Separation and Purification Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. containing either a thin PL porous layer (40 µm), and/or a DS dense membrane (500 µm), and/or a PS porous substrate (500 µm). Activated carbon (i.e. porogen agent) at 20 wt% was mixed with BSCF to form porous structures. The membranes were processed by dry pressing followed by sintering at high temperatures. The best oxygen fluxes of 2.86 mL min -1 cm -2 at 850 °C were achieved with the PL-DS membrane configuration, which delivered a 42% higher oxygen flux than the DS dense membrane. This improvement was attributed to the larger contact area with the air feed conferred by the thin PL porous layer. However, the PL-DS-PS configuration resulted in a 21% decrease of oxygen flux as compared to the PL-DS membrane which strongly suggested that the PS porous substrate contributed extra resistance to the transport of oxygen. CT scan analysis of the PS porous substrate revealed that the pore volume was concentrated in the center of the PS porous substrate, with a reduced pore volume contribution closer to the external surface. 3D 2 analysis revealed the connectivity of the regions closer to the external surface was over three orders of magnitude lower than that of the center of the PS porous substrate, thus creating a bottle-neck.Although all pores were large (> 1 µm), the expected resistance should be very low, however, the bottle-neck region closer to the external surface provided additional resistance for the transport of oxygen from the membrane interface to the permeate side.

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Section: Resultsmentioning

confidence: 99%

Influence of porous structures on O 2 flux of BSCF asymmetric membranes

Rachadel

Motuzas²,

Machado

et al. 2017

Separation and Purification Technology

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“…However, BSCF has structural instability problems, and Ba tends to react with CO 2 forming barium carbonates [19]. Leaching of BSCF compounds were also reported when membranes had long term steam exposure [120]. Improved stability of this compound has been achieved by replacing Ba in the A-site with La, thus forming a new compound LSCF.…”

Section: State Of the Artmentioning

confidence: 99%

Review of perovskite ceramic synthesis and membrane preparation methods

Athayde

Souza

Silva

et al. 2016

Ceramics International

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163

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In the 25 years since the first report of mixed ionic and electronic conducting ceramics, perovskite membranes underwent both research and development phases, with the latest works entering pilot trials for oxygen separation from air. During this time a number of perovskite synthesis methods were investigated from the original solid state chemistry through the more advanced and well established sol-gel route via the Pechinni method. The advances in synthesis methods were possible due to the desirable full incorporation of cations into the A and B-sites of perovskites with a general ABO 3 structure. In terms of membrane manufacturing, perovskite hollow fibres attracted a major research effort due to small membrane thickness and high fluxes. This led to a number of investigations by doping with other cations or by surface modification, all aiming at increasing oxygen fluxes. Recently, advanced ceramic processing by tape casting has led to the preparation of very thin dense films either on porous supports or as monoliths containing internal porous regions. All these developments in perovskite synthesis and membrane preparation methods, together with other types of methods requiring special equipment are addressed in this review, including an 2 analysis of the state of the art. Finally, future challenges are discussed in terms of competing technologies and potential industrial design directions of perovskite membranes for oxygen separation from air.

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“…It is known from the literature that the carbonic acid in water might affect the stability of oxygen permeation under steam as sweep gas 34 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 analysis by various characterizations.…”

Section: Elimination Of the Effect Of Carbonic Acid In Watermentioning

confidence: 99%

High Purity Oxygen Production via BBCN Perovskite Hollow Fiber Membrane Swept by Steam

Wang

Kathiraser

Ang

et al. 2015

Ind. Eng. Chem. Res.

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BaBi 0.05 Co 0.8 Nb 0.15 O 3-δ (BBCN) ceramic hollow fiber membranes have been fabricated via a phase conversion and sintering technology. Oxygen permeation test was operated under steam as sweep gas and the highest oxygen permeation flux is 11.07 ml cm -2 min -1 with purity of around 99.8% at 950 o C. The stability of the membrane exposure to steam was also investigated by oxygen permeation studies and further characterization by SEM, EDX, ICP, XRD, FTIR and XPS techniques. BBCN hollow fiber membrane still maintained oxygen permeability upon exposure to steam for 325 hours. The results show that despite an initial drop of around 30% in the oxygen permeation for the first 20-30 hours, it stabilized in the remaining time.Interestingly, the oxygen permeation can be in-situ recovered upon using inert sweep gas for 18 hours at high temperature. This study also reveals that the BBCN membrane exhibits good potential for integration with catalyst in a membrane reactor for oxidative steam reforming of hydrocarbon reactions.

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Production of pure oxygen from BSCF hollow fiber membranes using steam sweep

Cited by 34 publications

References 56 publications

Influence of porous structures on O 2 flux of BSCF asymmetric membranes

Influence of porous structures on O 2 flux of BSCF asymmetric membranes

Review of perovskite ceramic synthesis and membrane preparation methods

High Purity Oxygen Production via BBCN Perovskite Hollow Fiber Membrane Swept by Steam

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