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    Exhaust gas purification method using selective reduction catalyst
    18.
    发明申请
    Exhaust gas purification method using selective reduction catalyst 审中-公开
    使用选择还原催化剂的废气净化方法

    公开(公告)号：US20090269265A1

    公开(公告)日：2009-10-29

    申请号：US12385893

    申请日：2009-04-23

    申请人： Ryuji Ando ,  Takashi Hihara ,  Yasuharu Kanno ,  Makoto Nagata

    发明人： Ryuji Ando ,  Takashi Hihara ,  Yasuharu Kanno ,  Makoto Nagata

    IPC分类号： B01D53/56

    CPC分类号： B01D53/9418 ,  B01D53/90 ,  B01D53/9422 ,  B01D53/944 ,  B01D53/9468 ,  B01D2251/2067 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/2065 ,  B01D2255/20707 ,  B01D2255/20715 ,  B01D2255/20738 ,  B01D2255/20776 ,  B01D2255/40 ,  B01D2255/502 ,  B01D2255/808 ,  B01D2255/9022 ,  B01D2255/91 ,  B01D2255/9202 ,  B01D2258/012 ,  B01D2258/014 ,  F01N3/2066 ,  F01N2570/14 ,  F01N2610/02 ,  Y02A50/2344 ,  Y02C20/10 ,  Y02T10/24

    摘要： An exhaust gas purification method which is capable of purifying nitrogen oxide to be included in exhaust gas from a lean burn engine such as a boiler, a gas turbine or a lean-burn-type gasoline engine, a diesel engine, effectively, in particular, even at low temperature, with spray-supplying an aqueous solution of urea as the reducing component to the selective reduction catalyst.The exhaust gas purification method for reducing selectively NOx in exhaust gas, which is exhausted from a lean burn engine, with a selective reduction catalyst and ammonia, characterized in that an aqueous solution of urea is spray-supplied to the selective reduction catalyst, comprising at least the following zeolite (A) and the hydrolysis promotion component of urea (B), and it is contacted at 150 to 600° C., and ammonia is generated in a ratio of [NH3/NOx=0.5 to 1.5] to NOx in exhaust gas, as converted to ammonia, and a nitrogen oxide is decomposed into nitrogen and water. zeolite (A): zeolite comprising an iron element hydrolysis promotion component (B): a complex oxide comprising at least one kind selected from titania or titanium, zirconium, tungsten, silicon or alumina

    摘要翻译： 一种排气净化方法，其特征在于，能够从诸如锅炉，燃气轮机或稀燃型汽油发动机的柴油发动机，柴油发动机中净化包含在废气中的氮氧化物， 即使在低温下也可以向选择还原催化剂喷雾供应尿素水溶液作为还原组分。 一种废气净化方法，用于选择性还原催化剂和氨，从贫燃发动机排出的废气中选择性地还原NOx，其特征在于向选择性还原催化剂喷射供给尿素水溶液， 至少以下的沸石（A）和尿素（B）的水解促进成分，并且在150〜600℃下接触，以[NH 3 / NO x = 0.5〜1.5]的比例生成氨与NOx 废气转化为氨，氮氧化物分解成氮和水。 沸石（A）：包含铁元素水解促进组分的沸石（B）：包含选自二氧化钛或钛，锆，钨，硅或氧化铝中的至少一种的复合氧化物

    Exhaust gas aftertreatment system
    19.
    发明申请
    Exhaust gas aftertreatment system 有权
    废气后处理系统

    公开(公告)号：US20090145117A1

    公开(公告)日：2009-06-11

    申请号：US12150026

    申请日：2008-04-24

    申请人： Andreas Doring ,  Eberhard Jacob

    发明人： Andreas Doring ,  Eberhard Jacob

    IPC分类号： F01N9/00

    CPC分类号： F01N3/206 ,  B01D53/9418 ,  B01D53/944 ,  B01D53/9477 ,  B01D2251/2067 ,  B01D2255/20707 ,  B01D2255/20776 ,  B01D2255/2092 ,  B01D2255/30 ,  B01D2255/50 ,  B01D2255/808 ,  B01D2255/91 ,  B01D2257/404 ,  B01D2258/012 ,  B01D2258/014 ,  F01N3/021 ,  F01N3/035 ,  F01N3/106 ,  F01N3/2053 ,  F01N13/009 ,  F01N13/0097 ,  F01N13/011 ,  F01N2240/40 ,  F01N2330/60 ,  F01N2370/02 ,  F01N2610/02 ,  F02B37/00 ,  Y02T10/24

    摘要： Exhaust gas aftertreatment system for internal combustion engines operated with a lean mixture, wherein nitrogen oxides are reduced by an SCR catalyst, and particulates are removed by a particle separator or filter. A thermolysis catalyst is located near the engine in the exhaust gas split stream downstream of the supply point of the reducing agent. At temperatures above 135° C., this thermolysis catalyst vaporizes the water component of the aqueous urea solution. It contains a catalyst material that is thermally stable at exhaust gas temperatures occurring near the engine and preferentially reacts with the urea to form isocyanic acid. A hydrolysis catalyst is located in the exhaust gas stream downstream of the return of the split stream into the main stream of exhaust gas. The hydrolysis catalyst converts the isocyanic acid formed during thermolysis to ammonia and carbon dioxide using water vapor formed in the thermolysis catalyst.

    摘要翻译： 用贫混合物操作的内燃机的废气后处理系统，其中通过SCR催化剂还原氮氧化物，通过颗粒分离器或过滤器去除颗粒。 热解催化剂位于发动机靠近还原剂供给点下游的排气分流中。 在135℃以上的温度下，该热分解催化剂蒸发尿素水溶液的水分。 它含有在发动机附近出现的废气温度下热稳定的催化剂材料，并优先与尿素反应形成异氰酸。 水解催化剂位于废气流中，将排气流返回到废气的主流中。 水解催化剂使用在热解催化剂中形成的水​​蒸汽将热解期间形成的异氰酸酯转化成氨和二氧化碳。