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    • 10. 发明授权
    • Process for reducing the nitrogen oxides content of exhaust gas from an internal combustion engine
    • 降低来自内燃机的废气的氮氧化物含量的方法
    • US06238525B1
    • 2001-05-29
    • US09299630
    • 1999-04-27
    • Egbert LoxJürgen GieshoffWolfgang StrehlauThomas Kreuzer
    • Egbert LoxJürgen GieshoffWolfgang StrehlauThomas Kreuzer
    • C01B2100
    • F01N3/0842B01D53/32B01D53/92B01D53/9431F01N3/0807F01N3/0892F01N2240/28F02B1/04
    • A process for reducing the nitrogen oxides content of the exhaust gas from an internal combustion engine includes treating the exhaust gas in an electric gas discharge such that at least one of nitrogen dioxide or nitric acid are formed from nitrogen oxides in the exhaust gas; storing the nitrogen dioxides and/or the nitric acid in the form of nitrates on a nitrogen oxides storage material during phases when the engine operates with a greater than a stoichiometric air/fuel ratio (i.e., the storage phase); decomposing the nitrates to give nitrogen oxides during brief phases when the engine operates with a less than the stoichiometric air/fuel ratio (i.e., the desorption phase); and reducing the nitrogen oxides which are released from the storage material to nitrogen. The nitrogen oxides storage material may be located in an electric gas discharge zone, and the exhaust gas may be passed through the discharge and then over the storage material.
    • 用于降低来自内燃机的废气的氮氧化物含量的方法包括以排气中的氮氧化物形成至少一种二氧化氮或硝酸的电气放电来处理排气, 当发动机以大于化学计量的空气/燃料比(即储存阶段)运转时,在氮氧化物储存材料中将氮氧化物和/或硝酸以硝酸盐的形式储存在相中。 当发动机以小于化学计量的空气/燃料比(即,解吸阶段)运行时,在短时间内分解硝酸盐以产生氮氧化物; 并将从储存材料释放的氮氧化物还原成氮气。 氮氧化物存储材料可以位于电气放电区域中,并且排气可以通过排出物,然后通过存储材料。