公开(公告)号：US20030175192A1

公开(公告)日：2003-09-18

申请号：US10357773

申请日：2003-02-04

Applicant: ENGELHARD CORPORATION

Inventor： Zhicheng Hu ,  Patrick L. Burk ,  Shau-Lin F. Chen

IPC: B01D053/60

CPC classification number: B01D53/94 ,  B01D53/86 ,  B01D53/8637 ,  B01D2257/302 ,  B01D2257/404

Abstract: The present invention relates to a method and a catalyst composite useful for reducing contaminants in exhaust gas streams containing sulfur oxide contaminants. The method for removing NOx and SOx contaminants from a gaseous stream comprises providing a catalyst composite having a downstream section and an upstream section. The downstream section comprises a first support, a first platinum component, and a NOx sorbent component. The upstream section comprises a second support, a second platinum component, and a SOx sorbent component selected from the group consisting of oxides of Mg, Sr, and Ba. In a sorbing period, a lean gaseous stream comprising NOx and SOx is passed through the upstream section to sorb at least some of the SOx contaminants. The downstream section sorbs and abates the NOx in the gaseous stream. In a SOx desorbing period, the temperature of the gaseous stream is raised to within a desorbing temperature range to thereby desorb and abate at least some of the SOx contaminants in the upstream section. The desorbing temperature range is sufficiently high such that the SOx contaminants are substantially not sorbed in the downstream section. In a NOx desorbing period, the exhaust gas is converted from a lean stream to a rich stream to desorb and reduce at least some of the NOx contaminants from the downstream section.

Abstract translation: 本发明涉及一种可用于减少含有硫氧化物污染物的废气流中污染物的方法和催化剂复合物。 从气流中除去NOx和SOx污染物的方法包括提供具有下游部分和上游部分的催化剂复合材料。 下游部分包括第一支撑件，第一铂元件和NOx吸附剂部件。 上游部分包括选自Mg，Sr和Ba的氧化物的第二载体，第二铂组分和SO x吸附剂组分。 在吸附期间，包含NOx和SO x的贫气流通过上游段以吸附至少一些SOx污染物。 下游部分吸附并减轻气流中的NOx。 在SOx解吸时期，气流的温度升高到解吸温度范围内，从而解吸和消除上游段中至少一些SOx污染物。 解吸温度范围足够高，使得SOx污染物在下游段基本上不被吸附。 在NOx解吸期间，废气从贫流转化为富流，以解吸并从下游段减少至少一些NOx污染物。

公开(公告)号：US20040166036A1

公开(公告)日：2004-08-26

申请号：US10783805

申请日：2004-02-20

Applicant: ENGELHARD CORPORATION

Inventor： Shau-Lin F. Chen ,  Ronald M. Heck ,  Zhicheng Hu ,  Michel Deeba

IPC: B01D053/34

CPC classification number: F01N3/0835 ,  B01D53/944 ,  B01D53/945 ,  B01D53/9486 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/1025 ,  B01D2255/50 ,  B01J35/04 ,  B01J37/0244 ,  B01J37/0246 ,  F01N3/0814 ,  F01N3/2828 ,  F01N3/2832 ,  F01N2330/06 ,  F01N2330/08 ,  F01N2330/34 ,  Y02A50/2324 ,  Y02T10/22

Abstract: A catalyst system combining a low temperature conversion catalyst (LTC), a hydrocarbon adsorbent and, optionally, a three-way catalyst (TWC), is designed to achieve an ultra low vehicle emission standard for internal combustion engine powered vehicles, while never exposing the low temperature conversion catalyst to a temperature in excess of about 550null C.

Abstract translation: 将低温转化催化剂（LTC），烃类吸附剂和任选的三元催化剂（TWC）组合的催化剂体系被设计成实现用于内燃机驱动的车辆的超低车辆排放标准，同时不会暴露出 低温转化催化剂至超过约550℃的温度

公开(公告)号：US20040198595A1

公开(公告)日：2004-10-07

申请号：US10766374

申请日：2004-01-28

Applicant: Engelhard Corporation

Inventor： Shau-Lin F. Chen

IPC: B01D053/60

CPC classification number: B01D53/945 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/1025 ,  B01D2255/206 ,  B01D2255/9022 ,  B01D2255/91 ,  B01J23/58 ,  B01J23/63 ,  B01J23/8892 ,  B01J35/0006 ,  B01J37/0248 ,  Y02T10/22

Abstract: The present invention relates to a layered catalyst composite useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved catalysts of the type generally referred to as nullthree-way conversionnull catalysts. The layered catalysts trap sulfur oxide contaminants which tend to poison three-way conversion catalysts used to abate other pollutants in the stream. The layered catalyst composites of the present invention have a sulfur oxide absorbing layer before or above a nitrogen oxide absorbing layer. The layered catalyst composite comprises a first layer and a second layer. The first layer comprises a first support and at least one first platinum component. The second layer comprises a second support and a SOX sorbent component having a free energy of formation from about 0 to about null90 Kcal/mole at 350null C. The sulfur oxide absorbing layer selectively and reversibly absorbs sulfur oxides over nitrogen oxides and prevents or alleviates sulfur oxide poisoning of the nitrogen oxide trap.

Abstract translation: 本发明涉及一种用于减少废气流中污染物，特别是含有硫氧化物污染物的气流的层状催化剂复合物。 更具体地，本发明涉及通常称为“三向转化”催化剂的改进的催化剂。 分层催化剂捕获硫氧化物污染物，其倾向于毒化用于消除流中其它污染物的三元转化催化剂。 本发明的层状催化剂复合体在氮氧化物吸收层之前或之上具有硫氧化物吸收层。 层状催化剂复合材料包括第一层和第二层。 第一层包括第一载体和至少一种第一铂组分。 第二层包括第二载体和SO 3吸附剂组分，其在350℃下具有约0至约-90千卡/摩尔的自由能形成。硫氧化物吸收层选择性地和可逆地吸收氮氧化物上的硫氧化物并防止或 减轻氮氧化物陷阱的硫氧化物中毒。

公开(公告)号：US20030045424A1

公开(公告)日：2003-03-06

申请号：US09933586

申请日：2001-08-21

Applicant: ENGELHARD CORPORATION

Inventor： Michel Deeba ,  Shau-Lin F. Chen ,  John K. Hochmuth ,  Patrick L. Burk ,  Xinyi Wei

IPC: B01D053/56 ,  B01J023/34

CPC classification number: F01N3/0842 ,  B01D53/9431 ,  B01J23/34 ,  B01J23/6562 ,  B01J23/92 ,  B01J37/0201 ,  B01J37/0242 ,  B01J37/0248 ,  F01N3/0814 ,  F01N2250/12 ,  F01N2370/02 ,  F01N2370/22 ,  Y02C20/10 ,  Y02T10/24

Abstract: A catalytic trap disposed in an exhaust passage of an internal combustion engine which is operated with periodic alternations between lean and stoichiometric or rich conditions, for abatement of NOx in an exhaust gas stream which is generated by the engine. The trap comprises a catalytic trap material and a refractory carrier member on which the catalytic trap material is disposed. The catalytic trap material comprises: (i) a refractory metal oxide support; (ii) a catalytic component effective for promoting the reduction of NOx under stoichiometric or rich conditions; and (iii) a NOx sorbent effective for adsorbing the NOx under lean conditions and desorbing and reducing the NOx to nitrogen under stoichiometric or rich conditions. The NOx sorbent comprises a metal oxide selected from the group consisting of one or alkali metal oxides, alkaline earth metal oxides and mixtures of one or more alkali metal oxides and alkaline earth metal oxides. The manganese component is selected from the group consisting of: (1) a manganese oxide, (2) a mixed oxide of manganese and a transition metal and/or a rare earth metal, (3) a compound of an alkali metal and a manganese oxide, (4) a compound of an alkaline earth metal and a manganese oxide and (5) mixtures of the foregoing oxides and compounds.

Abstract translation: 设置在内燃机的排气通道中的催化捕集器，其在稀薄和化学计量或富含条件之间的周期性变化下操作，以减少由发动机产生的废气流中的NOx。 捕集器包括催化捕集材料和其上设置有催化捕集材料的耐火载体构件。 催化捕集材料包括：（i）难熔金属氧化物载体; （ii）在化学计量或富含条件下有效促进NOx还原的催化组分; 和（iii）有效地在稀薄条件下吸附NOx的NOx吸附剂，并且在化学计量或富含条件下将NOx解吸并还原成氮。 NOx吸附剂包括选自一种或碱金属氧化物，碱土金属氧化物和一种或多种碱金属氧化物和碱土金属氧化物的混合物的金属氧化物。 锰成分选自：（1）锰氧化物，（2）锰与过渡金属和/或稀土金属的混合氧化物，（3）碱金属和锰的化合物 氧化物，（4）碱土金属和氧化锰的化合物和（5）上述氧化物和化合物的混合物。

公开(公告)号：US20030021745A1

公开(公告)日：2003-01-30

申请号：US09834505

申请日：2001-04-13

Applicant: ENGELHARD CORPORATION

Inventor： Shau-Lin F. Chen

IPC: B01D053/60 ,  B01J023/42

CPC classification number: B01D53/945 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/1025 ,  B01D2255/206 ,  B01D2255/9022 ,  B01D2255/91 ,  B01J23/58 ,  B01J23/63 ,  B01J23/8892 ,  B01J35/0006 ,  B01J37/0248 ,  Y02T10/22

Abstract: The present invention relates to a layered catalyst composite useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved catalysts of the type generally referred to as nullthree-way conversionnull catalysts. The layered catalysts trap sulfur oxide contaminants which tend to poison three-way conversion catalysts used to abate other pollutants in the stream. The layered catalyst composites of the present invention have a sulfur oxide absorbing layer before or above a nitrogen oxide absorbing layer. The layered catalyst composite comprises a first layer and a second layer. The first layer comprises a first support and at least one first platinum component. The second layer comprises a second support and a SOX sorbent component having a free energy of formation from about 0 to about null90 Kcal/mole at 350null C. The sulfur oxide absorbing layer selectively and reversibly absorbs sulfur oxides over nitrogen oxides and prevents or alleviates sulfur oxide poisoning of the nitrogen oxide trap.

Abstract translation: 本发明涉及一种用于减少废气流中污染物，特别是含有硫氧化物污染物的气流的层状催化剂复合物。 更具体地，本发明涉及通常称为“三向转化”催化剂的改进的催化剂。 分层催化剂捕获硫氧化物污染物，其倾向于毒化用于消除流中其它污染物的三元转化催化剂。 本发明的层状催化剂复合体在氮氧化物吸收层之前或之上具有硫氧化物吸收层。 层状催化剂复合材料包括第一层和第二层。 第一层包括第一载体和至少一种第一铂组分。 第二层包括第二载体和SO 3吸附剂组分，其在350℃下具有约0至约-90千卡/摩尔的自由能形成。硫氧化物吸收层选择性地和可逆地吸收氮氧化物上的硫氧化物并防止或 减轻氮氧化物陷阱的硫氧化物中毒。