High-pressure CO2 permeation properties and stability of ceramic-carbonate dual-phase membranes

Oscar Ovalle-Encinia, Jerry Y.S. Lin

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

CO2 permeation properties and stability of ceramic-carbonate dual-phase membranes at high pressures/temperatures are critical to their CO2 separation and membrane reactor applications, but such data are not available in the literature. This work aims to study the effect of high transmembrane pressure on CO2 permeation flux and the stability of molten carbonate in the dual-phase samarium-doped ceria (SDC) and molten-carbonate (MC) membranes. Dead-end porous SDC tubular supports were made by a cold isostatic press (CIP)/sintering method with a low porosity (below 7%), and gas-tight SDC-MC membranes were prepared by direct infiltration of molten lithium and sodium carbonate mixture into SDC pores, with a MC volume fraction less than 7%. CO2 permeation/separation tests were performed on the SDC-MC membranes using feed gas of equal molar CO2/N2 mixture at feed pressures up to 15 atm and sweep gas of helium at 1 atm. CO2 permeation flux for the SDC-MC membranes depends logarithmically on feed/permeate CO2 pressure ratio in 660–810oC. The temperature dependence of CO2 permeation shows activation energy of 30 kJ/mol. Due to the small MC volume fraction and hence low effective carbonate conductivity, CO2 permeation of the SDC-MC membranes is dominated by the carbonate ionic conduction in the MC phase. The SDC-MC membranes remain in the same structure, morphology, and gas-tightness after CO2 separation tests at high feed pressures and temperatures, showing high stability of SDC-MC membranes for high-temperature, high-pressure separation and chemical reaction applications.

Original languageEnglish (US)
Article number120249
JournalJournal of Membrane Science
Volume646
DOIs
StatePublished - Mar 15 2022

Keywords

  • CO permeation
  • Dual-phase membranes
  • High temperature
  • Inorganic membranes
  • Membrane stability

ASJC Scopus subject areas

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

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