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RESEARCH PAPERS

Hydrogen Production From Methane by Using Oxygen Permeable Ceramics

[+] Author and Article Information
Hitoshi Takamura, Yusuke Aizumi, Atsunori Kamegawa, Masuo Okada

Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan, and CREST,Japan Science and Technology Agency

J. Fuel Cell Sci. Technol 3(2), 175-179 (Jan 09, 2006) (5 pages) doi:10.1115/1.2174066 History: Received July 25, 2005; Revised January 09, 2006

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 the methane reforming property of a novel member of oxygen permeable ceramics. The materials used are solid solutions of (La0.5Ba0.3Sr0.2)(FexIn1x)O3δ. The single phase of perovskite-type (La0.5Ba0.3Sr0.2)(FexIn1x)O3δ is obtained in the range of x=0.4 to 0.9. The highest oxygen flux densities of 2.2 and 11μmolcm2s (membrane thickness, L=0.2mm) are attained for (La0.5Ba0.3Sr0.2)(FexIn1x)O3δ(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)O3δ is dominated by p-type conduction having a slope of 14 under the high P(O2) region. The oxide-ion conductivity of the same sample is estimated to be 0.05Scm at 800°C. Even though the oxygen flux density slightly decreases with increasing time, high CO selectivity of 90% is kept for 100h. The oxygen flux density of the solid solution is also discussed in the context of surface exchange kinetics.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of hydrogen production from methane by using an oxygen permeable ceramics and a proton conductor

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Figure 2

Electrical conductivity and the resultant theoretical oxygen flux density as a function of oxygen partial pressure

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Figure 3

Lattice constant of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ as a function of Fe content

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Figure 4

Oxygen flux density of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ under He/air gradient as a function of Fe content

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Figure 5

Oxygen flux density of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ under CH4/air gradient as a function of Fe content

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Figure 6

Conductivity isotherms of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ (x=0.0 and 0.6)

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Figure 7

Methane reforming property of (La0.5Ba0.3Sr0.2)(Fe0.6In0.4)O3−δ at 1000°C

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Figure 8

The Young’s modulus and fracture toughness of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ as a function of Fe content, x

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Figure 9

The oxygen flux density of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ as a function of membrane thickness under He/air gradient

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Figure 10

The oxygen flux density of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ as a function of membrane thickness under H2/air gradient

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Figure 11

Thickness dependence of EMF for (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ under He/air gradient

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Figure 12

Thickness dependence of EMF for (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ under H2/air gradient

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Figure 13

Schematic illustration of decrease in effective P(O2) gradient under the limitation of surface exchange kinetics

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