NH_3によるN0_χの選択的接触還元法のメタノール火花点火エンジン排気ガスへの適用

概要

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The catalytic reduction of NO_x by NH_3 generated from NO_x has been applied to a methanol engine exhaust system. In automotive three-way catalyst (Pt-Rh coated) a large amount of NO_x was converted to NH_3 in a temperature range of 500~550 K and an excess air ratio of 0.9~1.0. On the other hand, NO_x reduction by NH_3 in methanol engine exhaust gas was favorably performed under the condition of O_2=2~4%, gas temperature= 450~500 K and NH_3≧ the stoichiometry of NO_x. Finally, about half an amount of NO_x was converted to NH_3 in a three-way catalyst and the formed NH_3 was reached with the NO_x left in the exhaust gas. The resulting NO_x reduction ratio was around 55%. On the basis of these results, some systems using the application of NO_x-NH_3 reactions to practical engines were proposed and their potential was discussed.
一般社団法人日本機械学会の論文
1986-04-25