TY - GEN
T1 - HYDROGEN PRODUCTION FROM METHANE BY USING OXYGEN PERMEABLE CERAMICS
AU - Takamura, Hitoshi
AU - Aizumi, Yusuke
AU - Kamegawa, Atsunori
AU - Okada, Masuo
N1 - Funding Information:
This work has been supported by CREST of Japan Science and Technology Agency (JST), Gas Bureau, City of Sendai, The Japan Research and Development Center for Materials (JRCM), and Ministry of Education, Science, Sports and Culture, Grant-in-Aid of Young Scientist (B), under contraction No. 15760512.
Publisher Copyright:
Copyright © 2005 by ASME.
PY - 2005
Y1 - 2005
N2 - Oxygen permeable ceramics based on mixed conductors are attracting much attention for use in partial oxidation of hydrocarbons as a novel technique for syngas and pure hydrogen production. This paper describes the preparation and oxygen permeation properties including methane reforming property of a novel member of oxygen permeable ceramics. The materials used are solid solutions of (La0.5Ba0.3Sr0.2)(FexIn1-x)O3-δ. The single phase of perovskite-type (La0.5Ba0.3Sr0.2)(FexIn1-x)O3-δ is obtained in the range of x = 0.4 to 0.9. The highest oxygen flux densities of 2.2 and 11 µmol/cm2 s are attained for (La0.5Ba0.3Sr0.2)(FexIn1-x) O3-δ (x = 0.6) at 1000 °C under He/air and CH4/air gradients, respectively. The electrical conductivity of (La0.5Ba0.3Sr0.2)(Fe0.6In0.4)O3-δ is dominated by p-type conduction having a slope of 1/4 under the high P(O2) region. The oxide-ion conductivity of the same sample is estimated to be 0.05 S/cm at 800ºC. Even though the oxygen flux density slightly decreases with increasing time, high CO selectivity of 90 % is kept for 100 h. The oxygen flux density of the solid solution is also discussed in the context of surface exchange kinetics.
AB - Oxygen permeable ceramics based on mixed conductors are attracting much attention for use in partial oxidation of hydrocarbons as a novel technique for syngas and pure hydrogen production. This paper describes the preparation and oxygen permeation properties including methane reforming property of a novel member of oxygen permeable ceramics. The materials used are solid solutions of (La0.5Ba0.3Sr0.2)(FexIn1-x)O3-δ. The single phase of perovskite-type (La0.5Ba0.3Sr0.2)(FexIn1-x)O3-δ is obtained in the range of x = 0.4 to 0.9. The highest oxygen flux densities of 2.2 and 11 µmol/cm2 s are attained for (La0.5Ba0.3Sr0.2)(FexIn1-x) O3-δ (x = 0.6) at 1000 °C under He/air and CH4/air gradients, respectively. The electrical conductivity of (La0.5Ba0.3Sr0.2)(Fe0.6In0.4)O3-δ is dominated by p-type conduction having a slope of 1/4 under the high P(O2) region. The oxide-ion conductivity of the same sample is estimated to be 0.05 S/cm at 800ºC. Even though the oxygen flux density slightly decreases with increasing time, high CO selectivity of 90 % is kept for 100 h. The oxygen flux density of the solid solution is also discussed in the context of surface exchange kinetics.
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U2 - 10.1115/FUELCELL2005-74173
DO - 10.1115/FUELCELL2005-74173
M3 - Conference contribution
AN - SCOPUS:85148002204
T3 - ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2005
SP - 593
EP - 599
BT - ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2005
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2005
Y2 - 23 May 2005 through 25 May 2005
ER -
