Abstract
Steam electrolysis cells were constructed using proton conducting ceramics SrCe0.95Yb0.05O3-α and SrZr0.9Yb0.1O3-α as electrolytes. The removal of nitrogen oxide (NO) by the hydrogen produced by steam electrolysis cells was examined. When a Co/Al2O3 catalyst was set on the cathode of the cell, NO was effectively removed even in excess O2. A cell with a SrCe0.95Yb0.05O3-α electrolyte and a Co/Al2O3 catalyst could remove NO with about 100% efficiency in N2 containing 8% O2 and 1000ppm NO at 440°C. On the other hand, the removal efficiency of NO for only a Co/Al2O3 catalyst was less than 4% under the same conditions. It was found that the steam electrolysis cell in combination with a Co/Al2O3 catalyst was very effective for the removal of NO in excess O2.
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