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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

## 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 the 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 $11μmol∕cm2s$ (membrane thickness, $L=0.2mm$) 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 $0.05S∕cm$ 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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## Figures

Figure 1

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

Figure 2

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

Figure 3

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

Figure 4

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

Figure 5

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

Figure 6

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

Figure 7

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

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

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

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

Figure 11

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

Figure 12

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

Figure 13

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

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