Development of a Non-Catalytic System for Reducing Nitric Oxide in Diesel Exhaust Using Methylamine as the reductant

研究了以甲胺（CH_3NH_2）为还原剂的选择性非催化还原柴油机排气中NO的方法。采用石英流动电加热反应器对部分柴油机尾气进行了实验研究，结果表明：在反应温度673 ~ 800 K范围内，[CH_3NH_2] / [NO]摩尔比为1.0时，NO还原率可达80%以上。并进行了针对柴油机整体排气的实验研究。在这些实验中，使用具有876 cc冲程容积的高速、单缸、水冷、自然吸气、四冲程、DI柴油发动机作为测试发动机，并且使用电控汽油喷射器在排气歧管处喷射40%水溶解的甲胺。结果表明，当氨与甲胺的摩尔比为3.0时，NO还原率可达70%左右，且无氨和甲胺泄漏。结果表明，当甲胺与尾气的摩尔比为1.0时，当甲胺与尾气完全混合时，NO还原率可达80%以上。

Selective non-catalytic system for reducing nitric oxide in diesel engine exhaust using methylamine (CH_3NH_2) as the reductant has been developed. The results obtained at the experiments for a part of diesel exhaust using a electrically heated quartz flow reactor show that more than 80% NO reduction ratio is achieved in the reactor temperature range of 673 K to 800 K with a molar ratio [CH_3NH_2] / [NO] of 1.0. Experiments targetting whole diesel exhaust has also been carried out. In those experiments, high speed, single cylinder, water cooled, naturally aspirated, four cycle, DI diesel engine having 876 cc of stroke volume was used as a test engine and 40% water solved methylamine was injected at a exhaust manifold using an electrically controlled gasoline injector. The results show that about 70% of NO reduction ratio is achieved at the molar ratio of 3.0 without the leak of ammonia and methylamine. It is further shown that more than 80% NO reduction ratio at the molar ratio of 1.0 can be attained bythe complete mixing of methylamine and exhaust.