Internal reforming molten carbonate fuel cell realizes high power generating efficiency by utilizing its generated heats in the cell to convert fuels into hydrogen rich gases. One of the crucial problem is deactivation of catalysts loaded in the cell. Deactivation phenomena of catalysts have been investigated by analyzing various catalysts after operating several thousands hours. The analyzed data suggest that the deactivation of catalyst is caused by the sintering of catalyst and support material. A correlation equation has been derived relating between the surface area or the specific dameter of catalysts and modified operation time, which explains the effect of operating temperature. Decay characteristics of reforming rate of internal reforming fuel cells have been predicted using this equation. They have shown same trend with experimental decay characteristics of several cells and stacks, utilizing various fuel gas compositions under the different flow patterns and the different operation temperatures.
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