Haworth, P.; Smart, S.; Serra Alfaro, JM.; Diniz Da Costa, J. (2012). Combined investigation of bulk diffusion and surface exchange parameters of silver catalyst coated yttrium-doped BSCF membranes. Physical Chemistry Chemical Physics. 14(25):9104-9111. https://doi.org/10.1039/c2cp41226h
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/87412
Title:
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Combined investigation of bulk diffusion and surface exchange parameters of silver catalyst coated yttrium-doped BSCF membranes
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Author:
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Haworth, Patrick
Smart, Simon
Serra Alfaro, José Manuel
Diniz da Costa, Joe
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UPV Unit:
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Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química
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Issued date:
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Abstract:
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[EN] The combined effect of minor yttrium doping and silver catalyst deposition on the surface kinetics (kchem) and bulk diffusion (D-chem) of BSCF (Ba0.5Sr0.5Co0.8Fe0.2O3-d) perovskite membranes was explored using electrical ...[+]
[EN] The combined effect of minor yttrium doping and silver catalyst deposition on the surface kinetics (kchem) and bulk diffusion (D-chem) of BSCF (Ba0.5Sr0.5Co0.8Fe0.2O3-d) perovskite membranes was explored using electrical conductivity relaxation (ECR) and validated using oxygen permeation measurements. Yttrium doping of BSCF to form Ba0.5Sr0.5Co0.8Fe0.175Y0.025O3-d (BSCFY) improved both the surface exchange kinetics and the bulk diffusion by an average of 44% and 177% respectively, supporting improved oxygen permeation measurements. The deposition of a silver catalyst on BSCFY further improved the surface kinetics by 63-450% at intermediate operating temperatures (600-750 degrees C), and reduced the activation energy from 163 to 90 kJ mol(-1). Interestingly, these improvements did not translate into enhanced oxygen fluxes for the silver coated thicker 0.5 and 1 mm membranes, indicating that the oxygen ion transport was limited by bulk diffusion. However, oxygen permeation measurements on catalyst-coated 0.3 mm-thick membranes yielded improvements of 20-35% in the range 600-900 degrees C. The silver catalyst was beneficial in overcoming surface kinetic limitations for the thinner 0.3 mm BSCFY membranes, thus suggesting that the critical thickness of BSCFY membranes lies around similar to 0.4 mm and validating the ECR measurements.
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Subjects:
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Condictivity relaxation experiments
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Hollow-fiber membranes
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Oxygen permeation
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Electrical conductivity
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Perovskite membranes
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Permeable membrane
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BA0.5SR0.5CO0.8FE0.2O3-DELTA
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Stability
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Transport
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Oxides
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Copyrigths:
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Cerrado |
Source:
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Physical Chemistry Chemical Physics. (issn:
1463-9076
) (eissn:
1463-9084
)
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DOI:
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10.1039/c2cp41226h
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Publisher:
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Royal Society of Chemistry
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Publisher version:
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http://doi.org/10.1039/c2cp41226h
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Project ID:
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info:eu-repo/grantAgreement/MICINN//ENE2011-24761/ES/DESARROLLO DE NUEVOS DISPOSITIVOS IONICOS PARA LA PRODUCCION EFICIENTE Y SOSTENIBLE DE ENERGIA Y PRODUCTOS QUIMICOS%2FCOMBUSTIBLES/
info:eu-repo/grantAgreement/ARC/Discovery Projects/DP0878849/AU/Perovskite Asymmetric Hollow Fibres for Oxygen Separation in Clean Coal Energy Delivery/
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Thanks:
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Patrick Haworth acknowledges the PhD scholarship provided by the Australian Government and The University of Queensland, and the International Travel Award provided by the University of Queensland Graduate School. The ...[+]
Patrick Haworth acknowledges the PhD scholarship provided by the Australian Government and The University of Queensland, and the International Travel Award provided by the University of Queensland Graduate School. The authors would like to thank the Australian Research Council (grant DP0878849) and Spanish Ministry for Science and Innovation (grant ENE2011-24761) for financial support of this research project.
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Type:
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Artículo
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