The reaction characteristics of an integrated reactor with steam reformer and catalytic combustor using
anode offgas for high temperature fuel cells such as MCFC and SOFC have been experimentally investigated
in the present study. The coupled reactor had a coaxial cylindrical shape, and the inner and the outer tube
was packed with combustion catalysts and reforming catalysts, respectively. Thus, the endothermic steam
reforming could proceed by absorbing heat from catalytic combustion of anode offgas. Results show that
increasing inlet temperature and decreasing excess air ratio increased the reformer temperature, which led
to the increase in H2 yield. The reforming performance for SOFC conditions was better than that for MCFC
conditions since the composition of flammable components became smaller for MCFC cases. Measured
reformate composition under various test conditions correlated well with thermal equilibrium composition.