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SOFC stack off gas contains unreacted fuel and can be used for thermal management in fuel cell system. In this study, the oxidation characteristic and catalytic activity evaluations were carried out through catalytic oxidation experiment of AOG from 2 kW SOFC. As a catalyst for AOG oxidation, commercial 2 wt% Pd-Pt honeycomb and ball type catalyst were used. For experiment, the oxidation system containing stack simulation device and catalytic oxidizer was fabricated. In experiment, the performance of catalytic oxidation was evaluated through analysis of reaction temperature according to presence and composition of catalyst. Also, the catalytic activity for AOG oxidation was found by analysis of CO concentration in exhaust gas. As a part of result, honeycomb type catalyst was evaluated as the superior catalyst due to the lowest levels of CO and NOx emissions. On the other hand, in order to compare the development characteristics of oxidation flame, visualization analysis of oxidation flame using honeycomb catalyst was conducted according to time and equivalence ratio, and the development of annular type oxidation flame was confirmed. In addition, the responsiveness to heat load of system was evaluated through AOG oxidation over equivalence ratio. Finally, designed catalytic oxidation system is estimated to remarkably oxidize the unreacted gas under the operating condition of the 2 kW SOFC system.

Oxidation Characteristic and Activity Evaluation of Anode Off Gas (AOG) by Pd-Pt Catalyst