メタノール燃焼排ガス中未燃焼成分のNO_x触媒による浄化

概要

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Characteristics of methanol reduction and formaldehyde formation with NO_x purification catalyst (NO_x catalyst) have been investigated to know the applicability of NO_x catalyst to lean burn or diesel type methanol engine. The catalysts used in this research were Co-γAl_2O_3 and Sn-Al_2O_3 as examples of NO_x catalysts and Pt-Al_2O_3 as an oxidation catalyst to be compared with NO_x catalyst. Pure γAl_2O_3 was also used additionally. Laboratory experiments were conducted by using above catalysts in oxygen rich atmosphere considering lean burn methanol engines or diesel type methanol engines. Reaction temperature and presenting NO concentration were selected as experimental parameters. The experimental results showed that methanol reduction temperature with NO_x catalyst became around 150℃ higher than that with oxidation catalyst and it became closer to engine exhaust gas temperature level. Large amount of formaldehyde was formed during the use of NO_x catalyst at a certain temperature range. The formation temperature range is higher than that with Pt catalyst, which may cause higher formaldehyde formation in the engine exhaust gas. Effect of NO on methanol oxidation and formaldehyde formation characteristics with NO_x catalyst was significant as was observed in oxidation catalysts. With increase in NO, methanol reduction rate became lower and the amount of formaldehyde formation increased.
一般社団法人日本機械学会の論文
1999-06-25