Ceramic-carbonate dual-phase membrane with improved chemical stability for carbon dioxide separation at high temperature

Tyler T. Norton, Jerry Lin

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Abstract

This study examines membrane synthesis, structural stability, permeation properties, and long-term permeation stability of a new dense dual-phase membrane of composition La0.85Ce0.1Ga0.3Fe 0.65Al0.05O3 - δ (LCGFA)-carbonate for high temperature CO2 separation. Porous ceramic supports made by sintering pressed powder at a temperature below its densification temperature resulted in a desired support with an open porosity ranging between 40 and 50%. The dual-phase membranes was prepared by direct infiltration of the ceramic supports in molten carbonate at 600 °C, resulting in a four order of magnitude decrease in permeance when compared to the support. LCGFA-carbonate membranes are stable when exposed to gases ranging from gas mixtures containing N2 and various concentrations of CO2 to simulated syngas, and exhibit a stable long term CO2 permeation flux of 0.025 mL·min- 1·cm- 2 for more than 275 h at 900 °C. The CO2 permeation results show exponential dependence to increasing system temperature as well as a linear dependence to logarithmic change in CO2 partial pressure gradients across the membrane in the CO2 pressure range studied.

Original languageEnglish (US)
Pages (from-to)172-179
Number of pages8
JournalSolid State Ionics
Volume263
DOIs
StatePublished - Oct 1 2014

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Keywords

  • Carbon dioxide permeation
  • Ceramic-carbonate
  • Dual-phase membrane
  • Perovskite

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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