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1. 发明授权

US08506893B2 Selective catalytic reduction catalyst system with expanded temperature window 有权
标题翻译：选择性催化还原催化剂体系具有扩展的温度窗口
公开(公告)号：US08506893B2
公开(公告)日：2013-08-13
申请号：US12108175
申请日：2008-04-23
申请人： Harendra S Gandhi , Joseph Robert Theis
发明人： Harendra S Gandhi , Joseph Robert Theis
IPC分类号： B01D50/00
CPC分类号： B01D53/9418 , B01D53/9477 , B01D2251/2062 , B01D2255/20738 , B01D2255/20761 , Y02T10/24
摘要： According to one embodiment of the present invention a selective reduction catalyst system with a broad temperature window for lean-burn gasoline and diesel engines is disclosed. The system includes a first and second zone, wherein the first zone is composed of an iron SCR catalyst and a second zone is composed of a copper SCR catalyst, and wherein the second zone is positioned downstream of the first zone. In another embodiment, a small copper SCR catalyst is placed in front of a second zone composed of an iron SCR catalyst and a third zone composed of a copper SCR catalyst, wherein the volume of the first copper SCR catalyst is a fraction of the volume of the second copper SCR catalyst. In yet another embodiment, a diverter valve would be included in the system to eliminate any NOx penalty produced by the front Cu SCR catalyst.
摘要翻译：根据本发明的一个实施方案，公开了一种具有用于稀燃汽油和柴油发动机的宽温度窗口的选择还原催化剂体系。该系统包括第一和第二区域，其中第一区域由铁SCR催化剂组成，第二区域由铜SCR催化剂组成，并且其中第二区域位于第一区域的下游。在另一个实施方案中，将小铜SCR催化剂放置在由铁SCR催化剂构成的第二区域的前面，以及由铜SCR催化剂组成的第三区域，其中第一铜SCR催化剂的体积为第二铜SCR催化剂。在另一个实施例中，系统中将包括一个分流阀，以消除由前Cu SCR催化剂产生的任何NOx损失。

2. 发明授权

US08776498B2 Air-injection system to improve effectiveness of selective catalytic reduction catalyst for gasoline engines 有权
标题翻译：空气注射系统，以提高汽油发动机选择性催化还原催化剂的有效性
公开(公告)号：US08776498B2
公开(公告)日：2014-07-15
申请号：US12103805
申请日：2008-04-16
申请人： Harendra S Gandhi , Robert Walter McCabe , Joseph Robert Theis
发明人： Harendra S Gandhi , Robert Walter McCabe , Joseph Robert Theis
IPC分类号： F01N3/00 , F01N3/10
CPC分类号： F01N3/206 , B01D53/9418 , B01D53/9422 , B01D53/945 , B01D53/9477 , B01D2251/11 , B01D2251/2062 , B01D2251/2067 , B01D2255/1021 , B01D2255/1023 , B01D2255/1025 , B01D2255/206 , B01D2255/20738 , B01D2255/20746 , B01D2255/2092 , B01D2255/50 , B01D2255/908 , B01D2255/91 , B01D2258/012 , F01N3/0807 , F01N3/0842 , F01N3/101 , F01N3/106 , F01N3/2053 , F01N3/2066 , F01N3/30 , F01N13/009 , F01N2370/02 , F01N2610/02 , Y02T10/22 , Y02T10/24
摘要： Embodiments are described to improve the durability of a lean NOx aftertreatment system. According to one embodiment of the present invention an air injection system is used to inject air continuously into the exhaust system between the upstream three-way catalyst and the downstream selective catalytic reduction (SCR) catalyst when the engine is operating at stoichiometric or rich air/fuel ratios and the exhaust temperatures are above a calibratible level (e.g., 700° C.). In another embodiment, an oxidation catalyst is positioned downstream of the air injection point to prevent exothermic reactions from occurring on the SCR. In another embodiment, the reductant for the SCR is generated in-situ. In yet another embodiment, a diverter valve with a reduction catalyst in a bypass arm is utilized to bypass the SCR during high load conditions.
摘要翻译：描述了实施例以改善贫NOx后处理系统的耐久性。根据本发明的一个实施例，当发动机以化学计量或富空气运行时，使用空气喷射系统将空气连续地喷射到上游三元催化剂和下游选择性催化还原（SCR）催化剂之间的排气系统中，燃料比和排气温度高于校准水平（例如700℃）。在另一个实施方案中，氧化催化剂位于空气注入点的下游，以防止在SCR上发生放热反应。在另一个实施方案中，用于SCR的还原剂是原位产生的。在另一个实施例中，在高负载条件下，利用在旁路臂中具有还原催化剂的分流阀绕过SCR。

3. 发明授权

US08062618B2 Exhaust aftertreatment system and method of treating exhaust gas 有权
标题翻译：排气后处理系统及废气处理方法
公开(公告)号：US08062618B2
公开(公告)日：2011-11-22
申请号：US12425986
申请日：2009-04-17
申请人： Lifeng Xu , Harendra S Gandhi , Robert Walter McCabe , Clifford Norman Montreuil
发明人： Lifeng Xu , Harendra S Gandhi , Robert Walter McCabe , Clifford Norman Montreuil
IPC分类号： B01D53/56
CPC分类号： F01N3/0814 , B01D53/9422 , B01D53/944 , B01D53/9481 , B01D2255/1021 , B01D2255/1023 , B01D2255/1025 , B01D2255/202 , B01D2255/204 , B01D2255/20738 , B01D2255/20761 , B01D2255/50 , B01D2255/9022 , B01D2258/012 , B01J23/58 , B01J29/072 , F01N3/021 , F01N3/0842 , F01N13/0093 , F01N2370/04 , Y02T10/24
摘要： A diesel exhaust aftertreatment system and method are provided. The system includes a lean NOx trap for reducing NOx and a transition metal-exchanged zeolite booster catalyst positioned downstream from the lean NOx trap for further reducing NOx. The lean NOx trap includes a NOx adsorbent material and one or more platinum group metals, and has a platinum group metal loading of less than about 90 g/ft3. The aftertreatment system provides high NOx conversion over a broad temperature range without the use of ammonia as a major reductant.
摘要翻译：提供柴油机废气后处理系统和方法。该系统包括用于还原NOx的贫NOx捕集器和位于贫NOx捕集器下游的用于进一步还原NOx的过渡金属交换的沸石增效催化剂。贫NOx捕集器包括NOx吸附剂材料和一种或多种铂族金属，并且具有小于约90g / ft 3的铂族金属负载量。后处理系统在宽的温度范围内提供高的NOx转化率，而不使用氨作为主要的还原剂。

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