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- W2054509866 abstract "Abstract In direct internal reforming-molten carbonate fuel cells (DIR-MCFC), deterioration of catalytic activity takes place in the anode channel due to both liquid-phase pollution and vapor-phase pollution. Although the liquid-phase pollution can be solved by installing protective barrier, an effective defense method and a reactivation method of vapor-phase polluted catalyst have not established yet. In order to study the reactivation method, the adhesion form of potassium compounds in the polluted catalyst under the various gas conditions was evaluated by using a thermogravimetric analyzer in which water vapor can feed. Additionally, the activity of the treated catalyst was also tested by a differential reactor. As a result, KOH changes to K 2 CO 3 under a CO 2 concentration of 25% or more. KOH becomes a solid-phase from the liquid-phase when it is changed into K 2 CO 3 . Therefore, the catalyst can not be reactive because K 2 CO 3 chokes pores of the catalyst. However, the activity of the polluted catalyst is revived to 80% of the initial activity by controlling the gas species concentration, especially CO 2 . Moreover, the catalytic activity can be revived under a steam–carbon ratio of 2.0 or more. Based on the results obtained by these fundamental experiments, the reactivation methods of catalyst polluted are proposed as follows: (i) catalyst should be loaded more upstream in the anode; (ii) in order to reactivate the polluted catalyst, the DIR-MCFC should maintain a steam–carbon ratio of 2.0 or more; (iii) gas conditions to activate the catalyst should be applied regularly." @default.
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- W2054509866 date "2003-05-01" @default.
- W2054509866 modified "2023-09-25" @default.
- W2054509866 title "Optimum operating conditions of DIR-MCFC without vapor-phase carbonate pollution" @default.
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- W2054509866 doi "https://doi.org/10.1016/s0378-7753(03)00088-0" @default.
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