Experimental results obtained with a bilayer-solid electrolyte membrane reactor (bilayer-SEMR) are analysed based on a 1D+1D reactor model and attainable yields in steady-state and forced-periodic operation modes are determined. Optimal steady-state operation conditions are predicted in the range of high Damkohler numbers and oxidizing conditions. Forced-periodic operation of bilayer-SEMRs, which is easily established via the electric current, leads to a significant selectivity enhancement, but has to be critically rated with respect to energy expenses needed under electrochemical-oxygen-pumping conditions. (c) 2007 Elsevier Ltd. All rights reserved.