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Title: Mixed-conducting membranes for hydrogen production and separation.

Abstract

Mixed-conducting oxides, possessing both ionic and electronic charge carriers, have found wide application in recent years in solid-state electrochemical devices that operate at high temperatures, e.g., solid-oxide fuel cells, batteries, and sensors. These materials also hold promise as dense ceramic membranes that separate gases such as oxygen and hydrogen from mixed-gas streams. We are developing Sr-Fe-Co oxide (SFC) as a membrane that selectively transports oxygen during partial oxidation of methane to syngas (mixture of CO and H2) because of SFC's high combined electronic and ionic conductivities. We have evaluated extruded tubes of SFC for conversion of methane to syngas in a reactor that was operated at {approx}900 C. Methane conversion efficiencies were >90%, and some of the reactor tubes were operated for >1000 h. We are also developing dense proton-conducting oxides to separate pure hydrogen from product streams that are generated during methane reforming and coal gasification. Hydrogen selectivity in these membranes is nearly 100%, because they are free of interconnected porosity. Although most studies of hydrogen separation membranes have focused on proton-conducting oxides by themselves, we have developed cermet (i.e., ceramic-metal composite) membranes in which metal powder is mixed with these oxides in order to increase their hydrogen permeability.more » Using several feed gas mixtures, we measured the nongalvanic hydrogen permeation rate, or flux, for the cermet membranes in the temperature range of 500-900 C. This rate varied linearly with the inverse of membrane thickness. The highest rate, {approx}32 cm3(STP)/min-cm2, was measured at 900 C for an {approx}15-{micro}m-thick membrane on a porous support structure when 100% H2 at ambient pressure was used as the feed gas.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
FE
OSTI Identifier:
972996
Report Number(s):
ANL/ES/CP-58002
TRN: US201005%%493
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 2006 Materials Research Society Fall Meeting; Nov. 27, 2006 - Dec. 1, 2006; Boston, MA
Country of Publication:
United States
Language:
ENGLISH
Subject:
08 HYDROGEN; 01 COAL, LIGNITE, AND PEAT; 03 NATURAL GAS; 30 DIRECT ENERGY CONVERSION; CERAMICS; CERMETS; CHARGE CARRIERS; COAL GASIFICATION; FUEL CELLS; GASES; HYDROGEN; HYDROGEN PRODUCTION; MEMBRANES; METHANE; MIXTURES; OXIDATION; OXIDES; OXYGEN; PERMEABILITY; POROSITY; THICKNESS

Citation Formats

Balachandran, U., Ma, B., Lee, T. H., Song, S. J., Chen, L., Dorris, S. E., and Energy Systems. Mixed-conducting membranes for hydrogen production and separation.. United States: N. p., 2007. Web.
Balachandran, U., Ma, B., Lee, T. H., Song, S. J., Chen, L., Dorris, S. E., & Energy Systems. Mixed-conducting membranes for hydrogen production and separation.. United States.
Balachandran, U., Ma, B., Lee, T. H., Song, S. J., Chen, L., Dorris, S. E., and Energy Systems. Mon . "Mixed-conducting membranes for hydrogen production and separation.". United States. doi:.
@article{osti_972996,
title = {Mixed-conducting membranes for hydrogen production and separation.},
author = {Balachandran, U. and Ma, B. and Lee, T. H. and Song, S. J. and Chen, L. and Dorris, S. E. and Energy Systems},
abstractNote = {Mixed-conducting oxides, possessing both ionic and electronic charge carriers, have found wide application in recent years in solid-state electrochemical devices that operate at high temperatures, e.g., solid-oxide fuel cells, batteries, and sensors. These materials also hold promise as dense ceramic membranes that separate gases such as oxygen and hydrogen from mixed-gas streams. We are developing Sr-Fe-Co oxide (SFC) as a membrane that selectively transports oxygen during partial oxidation of methane to syngas (mixture of CO and H2) because of SFC's high combined electronic and ionic conductivities. We have evaluated extruded tubes of SFC for conversion of methane to syngas in a reactor that was operated at {approx}900 C. Methane conversion efficiencies were >90%, and some of the reactor tubes were operated for >1000 h. We are also developing dense proton-conducting oxides to separate pure hydrogen from product streams that are generated during methane reforming and coal gasification. Hydrogen selectivity in these membranes is nearly 100%, because they are free of interconnected porosity. Although most studies of hydrogen separation membranes have focused on proton-conducting oxides by themselves, we have developed cermet (i.e., ceramic-metal composite) membranes in which metal powder is mixed with these oxides in order to increase their hydrogen permeability. Using several feed gas mixtures, we measured the nongalvanic hydrogen permeation rate, or flux, for the cermet membranes in the temperature range of 500-900 C. This rate varied linearly with the inverse of membrane thickness. The highest rate, {approx}32 cm3(STP)/min-cm2, was measured at 900 C for an {approx}15-{micro}m-thick membrane on a porous support structure when 100% H2 at ambient pressure was used as the feed gas.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

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