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/cm 2 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)(Fe0.6 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.
- Nanotechnology Institute
Hydrogen Production From Methane by Using Oxygen Permeable Ceramics
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Takamura, H, Aizumi, Y, Kamegawa, A, & Okada, M. "Hydrogen Production From Methane by Using Oxygen Permeable Ceramics." Proceedings of the 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. pp. 593-599. ASME. https://doi.org/10.1115/FUELCELL2005-74173
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