直接内部改質式溶融炭酸塩型燃料電池における改質触媒の活性劣化 : 気相炭酸塩付着の影響

概要

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In direct Internal Reforming Molten Carbonate Fuel Ceils (DIR MCFC) deterioration of catalytic activity takes place in the anode channel since the molten carbonate sometimes leaks and vaporizes there. In order to identify the process in DIR-MCFC, not only the activity of catalysts polluted in practical DIR-MCFC systems is evaluated, but also the important factors to deteriorate the catalytic activity are elucidated by using artificial polluted catalysts manufactured in this study. One of the deterioration factors in the practical systems affect quantitative and/or qualitative sintering. KOH mainly contaminates the catalyst rather than LiOH. The reaction rate constant of methane reforming reaction decrease with increasing the pollution ratio. However, the contamination does not act covering the active sites on the catalyst, and the overall reaction rate is not controlled by diffusion either into the pore or film surrounding the catalyst. If anything, vaporized KOH may enter into the micro pores, and results the decrease of active sites. In addition, the sintering phenomenon does not directly relate to the pollution. If the catalysts sinters, temperature of catalysts raises up since the reforming reaction indicates endothermic reaction. As the results, the temperature of catalyst attains the sintering temperature.
一般社団法人日本機械学会の論文
1999-01-25