Synthesis and characterization of thin ceramic-carbonate dual-phase membranes for carbon dioxide separation

Bo Lu, Y. S. Lin

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

Ceramic-carbonate dual-phase membranes are perm-selective to carbon dioxide at high temperatures. This paper reports a strategy to prepare thin ceramic-carbonate dual-phase membranes with improved carbon dioxide permeance. Two-layer asymmetric supports consisting of a large pore base support and a thin small pore ionic conducting ceramic top-layer were prepared for the thin dual-phase membranes. A dense thin ceramic-carbonate dual-phase membrane was successfully prepared on the asymmetric support containing carbonate non-wettable base with adequate mechanical bonding between the top-layer and base. The thin dual-phase membrane was constructed with a thin, small pore yttria-stabilized zirconia (YSZ) layer on a large pore Bi1.5Y0.3Sm0.2O3-δ (BYS) support. Li/Na/K molten carbonate mixture was infiltrated into the top YSZ layer via a direct infiltration method. Carbonate non-wettable BYS support stopped the penetration of carbonate and maintained its porous structure. By this way, a thin, dense ceramic-carbonate dual-phase membrane was prepared on a porous support after infiltration. High temperature CO2 permeation test was carried out for the membrane. CO2 permeance through the thin dual-phase membrane increased with temperature (500-650°C). At 650°C, maximum CO2 flux was 3.9×10-3molm-2s-1. The CO2 permeation activation energy is 106kJmol-1. The thin YSZ-carbonate dual-phase membrane offers much higher CO2 permeance than the reported thick dual-phase membranes. Reduction of the thickness hence lessening resistance and strengthening ionic transport should be the major reason.

Original languageEnglish (US)
Pages (from-to)402-411
Number of pages10
JournalJournal of Membrane Science
Volume444
DOIs
StatePublished - Oct 1 2013

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Keywords

  • CO permeation
  • Dual-phase membranes
  • Thin film
  • Wettability

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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