Development of proton-conducting membranes for separating hydrogen from gas mixtures

Conference · Mon Sep 01 04:00:00 EDT 1997

OSTI ID:650093

Balachandran, U; Guan, J; Dorris, S E ^[1]; Liu, M ^[2]

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1. Argonne National Lab., IL (United States). Energy Technology Div.
2. Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering

Thin and dense ceramic membranes fabricated from mixed protonic/electronic conductors can provide a simple, efficient means of separating hydrogen from gas streams and offer an alternative to existing methods of hydrogen recovery. Because mixed electronic/protonic conductors internally transport not only hydrogen (and thus provide the means to separate hydrogen from other gaseous components) but also electrons, hydrogen separation could be achieved in a non-Galvanic mode of operation (i.e., without the need for external electrodes, circuitry, and/or power supply). To be suitable as a hydrogen-permeable membrane, a material must exhibit sufficiently high electronic and protonic conductivities, and these conductivities must be approximately equal to one another to maximize hydrogen permeation through the material. In addition, the material must have sufficient mechanical integrity to withstand normal operating stresses and must be chemically stable under a wide range of gas atmospheres. This talk summarizes results obtained in Argonne`s effort to develop material for use as a hydrogen separation membrane. The transport properties of BaCe{sub 0.95}Y{sub 0.05}O{sub 3{minus}{alpha}} (5%-BCY) and SrCe{sub 0.95}Y{sub 0.05}O{sub 3{minus}{alpha}} (5%-SCY) were characterized by impedance spectroscopy, gas permeation, and open-cell voltage measurements. In this presentation, the authors describe the materials selection, synthesis, characterization, and performance evaluation of mixed-conducting dense ceramic membranes for hydrogen separation applications.

• Research Organization: Argonne National Lab., Energy Technology Div., IL (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 650093
• Report Number(s): ANL/ET/CP--94627; CONF-980318--; ON: DE98050037
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
36 MATERIALS SCIENCE
BARIUM OXIDES
CERIUM OXIDES
HYDROGEN
MATERIALS TESTING
MEMBRANE TRANSPORT
MEMBRANES
PERMEABILITY
SEPARATION PROCESSES
STRONTIUM OXIDES
YTTRIUM OXIDES