Hydrogen production from methane by using oxygen permeable ceramics

Hitoshi Takamura, Yusuke Aizumi, Atsunori Kamegawa, Masuo Okada

研究成果: Conference contribution

抄録

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)(FexIn 1-x)O3-δ. The single phase of perovskite-type (La0.5Ba0.3Sr0.2)(FexIn 1-x)O3-δis 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)(Fe xIn1-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)(Fe 0.6In0.4)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 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.

本文言語English
ホスト出版物のタイトルProceedings of the 3rd International Conference on Fuel Cell Science, Engineering, and Technology, 2005
編集者R.K. Shah, E.U. Ubong, S.S. Samuelsen
ページ593-599
ページ数7
出版ステータスPublished - 2005 11 22
外部発表はい
イベント3rd International Conference on Fuel Cell Science, Engineering, and Technology, 2005 - Ypsilanti, MI, United States
継続期間: 2005 5 232005 5 25

出版物シリーズ

名前Proceedings of the 3rd International Conference on Fuel Cell Science, Engineering, and Technology, 2005

Other

Other3rd International Conference on Fuel Cell Science, Engineering, and Technology, 2005
国/地域United States
CityYpsilanti, MI
Period05/5/2305/5/25

ASJC Scopus subject areas

  • 工学(全般)

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