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AbstractAn increased interest in using hydrocarbons in solid oxide fuel cells for the production of power has 20 led to research into operation on synthesis (syn) gas, a mixture of hydrogen and carbon monoxide.Hydrocarbons are typically reformed, either internally or in an external reformer prior to the fuel cell, producing syngas with various H 2 :CO ratios depending on the hydrocarbon used. This paper examines the effect of varying the H 2 :CO ratio with respect to C 1 to C 4 steam reforming reactions and additionally a mixture containing a higher ratio of carbon monoxide. It was found that there was no 25 significant relationship between cell performance and H 2 :CO ratio when a high feed rate was employed. For low flow rates, however, the high carbon monoxide concentration resulted in a significant decrease in cell performance. It was determined that this was caused by reversible carbon deposition as opposed to a decrease in carbon monoxide reactivity.