Tailoring of porosity of yttria-stabilized zirconia tubes as supports for oxygen separation membranes

Astri Bjørnetun Haugen, Dhavanesan Kothanda Ramachandran, Jonas Gurauskis, Andreas Kaiser, Martin Søgaard

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

Pure oxygen gas supplied by ceramic oxygen transport membranes can facilitate reduced CO2 emissions through more efficient gasification processes and CO2 capture and storage. Tubular membranes have some advantages compared to planar membranes, such as better resistance to thermal gradients and more straightforward sealing. The active oxygen separation layer in the membrane should be as thin as possible and therefore supported on a highly porous tubular substrate. In this work tubular porous supports of yttria-stabilized zirconia have been manufactured using thermoplastic extrusion. Two types of poreformers (spherical graphite (d50 18 μm) and polymethyl methacrylate (d50 10 μm)) have been used to form connected macropores, since their spherical geometry limits preferential orientation during extrusion. Their difference in decomposition temperatures also allows a high volume fraction of pore formers without deformation during debinding. The influence of the amount of pore formers (relative to the amount of ceramic and thermoplastics) on the microstructure of sintered samples, as well as the extrudability and ease of debinding of the feedstock, has been studied. Ceramics with 1-20 μm pores, open porosities exceeding 55 % and gas permeabilities close to 10-14 m2 could be produced, demonstrating that thermoplastic extrusion is suitable for fabrication of porous and permeable tubes.
Original languageEnglish
Publication date2015
Publication statusPublished - 2015
Event11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications - Hyatt Regency Vancouver, Vancouver, Canada
Duration: 14 Jun 201519 Jun 2015
Conference number: 11

Conference

Conference11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications
Number11
LocationHyatt Regency Vancouver
CountryCanada
CityVancouver
Period14/06/201519/06/2015

Bibliographical note

Oral presentation

Keywords

  • High porosity
  • Extrusion
  • Thermoplasticity
  • Oxygen transport membrane
  • Porous substrates
  • Porous YSZ

Cite this

Bjørnetun Haugen, A., Kothanda Ramachandran, D., Gurauskis, J., Kaiser, A., & Søgaard, M. (2015). Tailoring of porosity of yttria-stabilized zirconia tubes as supports for oxygen separation membranes. Abstract from 11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications, Vancouver, Canada.