Effects of separation layer thickness on oxygen permeation and mechanical strength of DL-HFMR-ScSZ

Zhentao Wu, Alan Thursfield, Ian Metcalfe, K. Li*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

It has been demonstrated in our previous studies that in order for greater methane conversion and less coke-formation, a higher oxygen permeation rate through the outer oxygen separation layer of a functional dual-layer ceramic hollow fibre membrane is needed. Besides new membrane materials with higher oxygen permeability, another way of improving oxygen permeation is to reduce the separation layer thickness, although this strategy is limited by the characteristic thickness, L c, where bulk diffusion and surface oxygen exchange are both important. As a result, a series of La 0.80Sr 0.20MnO 3-δ (LSM)-Scandia(10%)-Stabilized-Zirconia (ScSZ)/ScSZ-NiO functional dual-layer hollow fibres (DL-HF) with an outer oxygen separation layer thickness between approximately 8.0 and 72.4μm were fabricated in this study, by using the single-step co-extrusion and co-sintering process. The effects of separation layer thickness on oxygen permeation and mechanical strength were investigated. The oxygen permeation of the LSM-ScSZ separation layer is more likely to be controlled by surface exchange at higher temperatures, and changes to mixed control by both bulk diffusion and surface exchange at lower temperatures. A thicker separation layer also results in a thinner catalytic substrate layer, and subsequently decreases the mechanical strength of the dual-layer hollow fibre membrane.

Original languageEnglish
Pages (from-to)229-236
Number of pages8
JournalJournal of Membrane Science
Volume415-416
DOIs
Publication statusPublished - 1 Oct 2012

Fingerprint

Scandium
scandium
zirconium oxides
Permeation
Zirconia
Strength of materials
Oxygen
oxygen
hollow
Membranes
membranes
Coke
fibers
Ceramic fibers
Temperature
zirconium oxide
Fibers
Methane
Ceramics
coke

Bibliographical note

© 2012, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Co-extrusion and co-sintering
  • Dual-layer ceramic hollow fibre
  • Membrane reactor
  • Methane conversion
  • Oxygen permeation

Cite this

@article{4129e8989f1a44308a243d862ee79e58,
title = "Effects of separation layer thickness on oxygen permeation and mechanical strength of DL-HFMR-ScSZ",
abstract = "It has been demonstrated in our previous studies that in order for greater methane conversion and less coke-formation, a higher oxygen permeation rate through the outer oxygen separation layer of a functional dual-layer ceramic hollow fibre membrane is needed. Besides new membrane materials with higher oxygen permeability, another way of improving oxygen permeation is to reduce the separation layer thickness, although this strategy is limited by the characteristic thickness, L c, where bulk diffusion and surface oxygen exchange are both important. As a result, a series of La 0.80Sr 0.20MnO 3-δ (LSM)-Scandia(10{\%})-Stabilized-Zirconia (ScSZ)/ScSZ-NiO functional dual-layer hollow fibres (DL-HF) with an outer oxygen separation layer thickness between approximately 8.0 and 72.4μm were fabricated in this study, by using the single-step co-extrusion and co-sintering process. The effects of separation layer thickness on oxygen permeation and mechanical strength were investigated. The oxygen permeation of the LSM-ScSZ separation layer is more likely to be controlled by surface exchange at higher temperatures, and changes to mixed control by both bulk diffusion and surface exchange at lower temperatures. A thicker separation layer also results in a thinner catalytic substrate layer, and subsequently decreases the mechanical strength of the dual-layer hollow fibre membrane.",
keywords = "Co-extrusion and co-sintering, Dual-layer ceramic hollow fibre, Membrane reactor, Methane conversion, Oxygen permeation",
author = "Zhentao Wu and Alan Thursfield and Ian Metcalfe and K. Li",
note = "{\circledC} 2012, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/",
year = "2012",
month = "10",
day = "1",
doi = "10.1016/j.memsci.2012.05.003",
language = "English",
volume = "415-416",
pages = "229--236",
journal = "Journal of Membrane Science",
issn = "0376-7388",
publisher = "Elsevier",

}

Effects of separation layer thickness on oxygen permeation and mechanical strength of DL-HFMR-ScSZ. / Wu, Zhentao; Thursfield, Alan; Metcalfe, Ian; Li, K.

In: Journal of Membrane Science, Vol. 415-416, 01.10.2012, p. 229-236.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of separation layer thickness on oxygen permeation and mechanical strength of DL-HFMR-ScSZ

AU - Wu, Zhentao

AU - Thursfield, Alan

AU - Metcalfe, Ian

AU - Li, K.

N1 - © 2012, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2012/10/1

Y1 - 2012/10/1

N2 - It has been demonstrated in our previous studies that in order for greater methane conversion and less coke-formation, a higher oxygen permeation rate through the outer oxygen separation layer of a functional dual-layer ceramic hollow fibre membrane is needed. Besides new membrane materials with higher oxygen permeability, another way of improving oxygen permeation is to reduce the separation layer thickness, although this strategy is limited by the characteristic thickness, L c, where bulk diffusion and surface oxygen exchange are both important. As a result, a series of La 0.80Sr 0.20MnO 3-δ (LSM)-Scandia(10%)-Stabilized-Zirconia (ScSZ)/ScSZ-NiO functional dual-layer hollow fibres (DL-HF) with an outer oxygen separation layer thickness between approximately 8.0 and 72.4μm were fabricated in this study, by using the single-step co-extrusion and co-sintering process. The effects of separation layer thickness on oxygen permeation and mechanical strength were investigated. The oxygen permeation of the LSM-ScSZ separation layer is more likely to be controlled by surface exchange at higher temperatures, and changes to mixed control by both bulk diffusion and surface exchange at lower temperatures. A thicker separation layer also results in a thinner catalytic substrate layer, and subsequently decreases the mechanical strength of the dual-layer hollow fibre membrane.

AB - It has been demonstrated in our previous studies that in order for greater methane conversion and less coke-formation, a higher oxygen permeation rate through the outer oxygen separation layer of a functional dual-layer ceramic hollow fibre membrane is needed. Besides new membrane materials with higher oxygen permeability, another way of improving oxygen permeation is to reduce the separation layer thickness, although this strategy is limited by the characteristic thickness, L c, where bulk diffusion and surface oxygen exchange are both important. As a result, a series of La 0.80Sr 0.20MnO 3-δ (LSM)-Scandia(10%)-Stabilized-Zirconia (ScSZ)/ScSZ-NiO functional dual-layer hollow fibres (DL-HF) with an outer oxygen separation layer thickness between approximately 8.0 and 72.4μm were fabricated in this study, by using the single-step co-extrusion and co-sintering process. The effects of separation layer thickness on oxygen permeation and mechanical strength were investigated. The oxygen permeation of the LSM-ScSZ separation layer is more likely to be controlled by surface exchange at higher temperatures, and changes to mixed control by both bulk diffusion and surface exchange at lower temperatures. A thicker separation layer also results in a thinner catalytic substrate layer, and subsequently decreases the mechanical strength of the dual-layer hollow fibre membrane.

KW - Co-extrusion and co-sintering

KW - Dual-layer ceramic hollow fibre

KW - Membrane reactor

KW - Methane conversion

KW - Oxygen permeation

UR - http://www.scopus.com/inward/record.url?scp=84864746352&partnerID=8YFLogxK

UR - https://www.sciencedirect.com/science/article/pii/S0376738812003675?via%3Dihub

U2 - 10.1016/j.memsci.2012.05.003

DO - 10.1016/j.memsci.2012.05.003

M3 - Article

AN - SCOPUS:84864746352

VL - 415-416

SP - 229

EP - 236

JO - Journal of Membrane Science

JF - Journal of Membrane Science

SN - 0376-7388

ER -