Electrochemical hydrogen permeation in a proton-hole mixed conductor and its application to a membrane reactor
- Nagoya Univ. (Japan). Synthetic Crystal Lab.
A proton-hole mixed conduction in SrCe[sub 0.95]Yb[sub 0.05]Yb[sub 0.05]O[sub 3[minus][alpha]] ceramic has been studied under an asymmetrical atmosphere with respect to hydrogen species. The following electrochemical cell was constructed; (1) 1% hydrogen, Pt [vert bar] specimen ceramic [vert bar] Pt, O[sub 2]-Ar mixture (2) and electrochemical hydrogen permeation through this sample was examined under open- and closed-circuit conditions. When the circuit was closed, the hydrogen or water vapor evolution rates at the cathode decreased with increasing partial pressure of oxygen in the cathode. From the conductivity measurement under various p[sub O[sub 2]], it was confirmed that the main charge carrier except protons was a positive hole, and that this ceramic behaved as a proton-hole mixed conductor under the asymmetrical condition. When the circuit was open, water vapor evolved spontaneously, and its formation rates were enhanced with increasing p[sub O[sub 2]] in compartment (2). These phenomena indicate that this cell is a self-short-circuited via hole conduction in the bulk, and that hydrogen permeates electrochemically from compartment (1) to (2). Further, based on the principle of hydrogen permeation due to the proton-hole mixed conduction, CH[sub 4] dimerization was carried out at 1,173 K using SrCe[sub 0.95]Yb[sub 0.05]O[sub 3 [minus][alpha]] ceramic as a membrane reactor. Formation rates of C[sub 2]-hydrocarbons were enhanced markedly by shelf-short-circuiting the electrochemical reactor due to the mixed conduction. To clarify the mechanism for the acceleration of CH[sub 4] dimerization, the electrolytic synthesis of ethane from CH[sub 4] was carried out at 948 K using SrCe[sub 0.95]Yb[sub 0.05]O[sub 3[minus][alpha]] ceramic as a membrane reactor.
- OSTI ID:
- 7027249
- Journal Information:
- Journal of the Electrochemical Society; (United States), Vol. 141:7; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
03 NATURAL GAS
CERIUM OXIDES
PERMEABILITY
CHEMICAL REACTORS
DESIGN
HYDROGEN
MEMBRANE TRANSPORT
METHANE
DIMERIZATION
ELECTROLYSIS
STRONTIUM OXIDES
YTTERBIUM OXIDES
ETHANE
ETHYLENE
IONIC CONDUCTIVITY
SYNTHESIS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
HYDROCARBONS
LYSIS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYMERIZATION
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
YTTERBIUM COMPOUNDS
100200* - Synthetic Fuels- Production- (1990-)
360204 - Ceramics
Cermets
& Refractories- Physical Properties
030400 - Natural Gas- Products & By-Products