公开(公告)号：US06375910B1

公开(公告)日：2002-04-23

申请号：US09527910

申请日：2000-03-17

申请人： Michel Deeba ,  Uwe Dahle ,  Stefan Brandt

发明人： Michel Deeba ,  Uwe Dahle ,  Stefan Brandt

IPC分类号： B01D5394

CPC分类号： B01J23/63 ,  B01D53/9422 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/1025 ,  B01D2255/2022 ,  B01D2255/2027 ,  B01D2255/2042 ,  B01D2255/9022 ,  B01D2255/903 ,  B01D2258/012 ,  B01J23/58 ,  B01J35/0006 ,  B01J35/04 ,  B01J37/0242 ,  B01J37/0244 ,  B01J37/0248 ,  F01N3/0807 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0871 ,  F01N3/2828 ,  F01N2330/00 ,  F01N2330/06 ,  F01N2570/14 ,  F01N2610/03 ,  Y02A50/2344

摘要： A multi-zoned catalytic trap for conversion of NOx in an exhaust gas stream which emanates from an engine which is operated with periodic alternations between lean, and stoichiometric or rich, conditions. The catalytic trap comprises a first zone, a second zone and, optionally, one or more intermediate zones disposed between the first zone and the second zone. Each of the zones comprises a catalytic trap material coated on a refractory carrier member. In the first zone, the catalytic trap material comprises a refractory metal oxide support having dispersed thereon a palladium catalytic component in the amount of about 30 to about 300 g/ft3, a platinum catalytic component in the amount of 0 to about 100 g/ft3 and a rhodium catalytic component in the amount of 0 to about 10 g/ft3; and a NOx sorbent comprising one or more basic oxygenated compounds of one or more alkaline earth metals and optionally, one or more basic oxygenated compounds of one or more alkali metals. In the second zone, the catalytic trap material comprises a refractory metal oxide support having dispersed thereon a palladium catalytic component in the amount of 0 to about 50 g/ft3, a platinum catalytic component in the amount of about 10 to about 100 g/ft3 and a rhodium catalytic component in the amount of about 5 to about 20 g/ft3; and a NOx sorbent comprising one or more basic oxygenated compounds of one or metals selected from the group consisting of alkali metals and alkaline earth metals. In the optional zone(s), the catalytic trap material comprises a refractory metal oxide support having dispersed thereon a palladium catalytic component in the amount of about 25 to about 75 g/ft3, a platinum catalytic component in the amount of about 5 to about 30 g/ft3 and a rhodium catalytic component in the amount of 0 to about 10 g/ft3; and a NOx sorbent comprising one or more basic oxygenated compounds of one or metals selected from the group consisting of alkali metals and alkaline earth metals.

公开(公告)号：US06497848B1

公开(公告)日：2002-12-24

申请号：US09643457

申请日：2000-08-22

申请人： Michel Deeba ,  Uwe Dahle ,  Stefan Brandt ,  John K. Hochmuth

发明人： Michel Deeba ,  Uwe Dahle ,  Stefan Brandt ,  John K. Hochmuth

IPC分类号： B01D5394

CPC分类号： B01J35/0006 ,  B01D53/9413 ,  B01J23/58 ,  B01J23/63 ,  B01J37/0242 ,  B01J37/0244 ,  B01J37/0248 ,  F01N3/0807 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0871 ,  F01N2330/00 ,  F01N2330/06 ,  F01N2610/03

摘要： A catalytic trap (10, 110) effective for conversion of NOx in an exhaust gas stream is inert to high-temperature reaction with basic oxygenated compounds of lithium, sodium or potassium. The catalytic trap may be substantially free of silica components and may include a catalytic trap material (20, 120) which contains a refractory metal oxide support, e.g., alumina, having dispersed thereon a catalytic component, such as a platinum group metal catalytic component, and a NOx sorbent comprised of one or more of the basic oxygenated compounds. The catalytic trap material is coated onto a suitable carrier member (12, 112), such as one made from stainless steel, titanium, alumina, titania, zirconia or silica-leached cordierite. A method of treating a NOx-containing gas stream involves maintaining the gas stream in alternating periods of (1) lean and (2) rich or stoichiometric conditions and contacting the gas stream with the catalytic trap under conditions in which NOx is adsorbed during periods of lean operation and released and reduced to nitrogen during periods of rich operation.

摘要翻译： 对废气流中的NOx转化有效的催化捕集器（10,110）对与锂，钠或钾的碱性氧化化合物的高温反应是惰性的。 催化捕集器可以基本上不含二氧化硅组分，并且可以包括催化捕集材料（20,120），催化捕集材料包含难熔金属氧化物载体，例如在其上分散有催化组分如铂族金属催化组分的氧化铝， 和由一种或多种碱性氧化化合物组成的NOx吸附剂。 将催化捕集材料涂覆到合适的载体构件（12,112）上，例如由不锈钢，钛，氧化铝，二氧化钛，氧化锆或二氧化硅浸提的堇青石制成的载体构件。 一种处理含NO x的气流的方法包括将气流保持在（1）贫和（2）富集或化学计量条件的交替时段内，并且在气体流与催化捕集器接触的条件下， 精益营运，丰富经营期间释放并减少氮。