プロトン導電性セラミックス及びCo/Al_2O_3触媒を用いた水蒸気電解セルによる窒素酸化物の除去

概要

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Steam electrolysis cells were constructed using proton conducting ceramics SrCe_<0.95>Yb_<0.05>O_<3-α> and SrZr_<0.9>Yb_<0.1>O_<3-α> as electrolytes. The removal of nitrogen oxide (NO) by the hydrogen produced by steam electrolysis cells was examined. When a Co/Al_2O_3 catalyst was set on the cathode of the cell, NO was effectively removed even in excess O_2. A cell with a SrCe_<0.95>Yb_<0.05>O_<3-α> electrolyte and a Co/Al_2O_3 catalyst could remove NO with about 100% efficiency in N_2 containing 8% O_2 1000 ppm NO at 440℃. On the other hand, the removal efficiency of NO for only a Co/Al_2O_3 catalyst was less than 4% under the same conditions. It was found that the steam electrolysis cell in combination with a Co/Al_2O_3 catalyst was very effective for the removal of NO in excess O_2.
社団法人日本セラミックス協会の論文
2000-06-01