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Hydrogen Production From Methane by Using Oxygen Permeable Ceramics

[+] Author Affiliations
Hitoshi Takamura, Yusuke Aizumi, Atsunori Kamegawa, Masuo Okada

Tohoku University, Sendai, Japan

Paper No. FUELCELL2005-74173, pp. 593-599; 7 pages
doi:10.1115/FUELCELL2005-74173
From:
  • ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology
  • 3rd International Conference on Fuel Cell Science, Engineering and Technology
  • Ypsilanti, Michigan, USA, May 23–25, 2005
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-3764-5 | eISBN: 0-7918-3757-2
  • Copyright © 2005 by ASME

abstract

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 (La0.5 Ba0.3 Sr0.2 )(Fex In1−x )O3−δ . The single phase of perovskite-type (La0.5 Ba0.3 Sr0.2 )(Fex In1−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/cm 2 s are attained for (La0.5 Ba0.3 Sr0.2 )(Fex In1−x )O3−δ (x = 0.6) at 1000 °C under He / air and CH4 / air gradients, respectively. The electrical conductivity of (La0.5 Ba0.3 Sr0.2 )(Fe0.6 In0.4 )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 800°C. 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.

Copyright © 2005 by ASME

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