The conversion of coal, biomass and RDF (refuse-derived fuel) etc, by means of gasification into a fuel suitable for a high temperature fuel cell has recently received more attention as a potential substitute for fossil fuels in electric power production. However, combining the gasification with a high temperature fuel cell (Molten Carbonate Fuel Cell) raises many questions with regard to gas quality and impurities. We have paid attention to H2S impurity contained in fuel gas and investigated the effect of H2S on MCFC performance by operating a 10kW-class stack. The experimental results show the H2S tolerable concentration to MCFC performance decreases with the decrease of H2 concentration in fuel gas. A reason for this H2S tolerance is due to the inhibition for shift reaction (H2O + CO → H2 + CO2) by H2S adsorption to anode. This inhibition by H2S adsorption decreases the capability of high temperature fuel cell to utilize CO as a fuel.

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