Gradual Internal Methane Reforming in Intermediate‐Temperature Solid‐Oxide Fuel Cells

摘要: Gradual internal reforming is based on local coupling between steam of the fuel which occurs a catalyst and hydrogen electrochemical oxidation at electrode triple-phase perimeter. In order to demonstrate feasibility this strategy, catalytic properties lanthanum chromite, pure impregnated with ruthenium, were investigated. Ruthenium supported chromite exhibits very good activity for methane. Full conversion obtained ratios H{sub 2}O/CH{sub 4} even lower than 1 700 C. No carbon deposition could be detected after 100 h operation. Electrochemical measurements, carried out by impedance spectroscopy cone-shaped microelectrodes show that overpotential resistance under 2}/H{sub 2}O CO/CO{sub 2} much CH{sub 4}/H{sub 2}O. presence diagrams methane are fairly similar gas analysis shows some reformed. This observation demonstrates gradual can implemented. A detailed so-called high-frequency semicircle virtually independent nature atmosphere. indicates it not directly related tomore » any chemical or step reaction.« less