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：US20040198592A1

公开(公告)日：2004-10-07

申请号：US10406891

申请日：2003-04-04

Applicant: ENGELHARD CORPORATION

Inventor： Zhicheng Hu ,  Knut Wassermann ,  Patrick L. Burk ,  Youchang Xie ,  Wei Lin

IPC: B01J023/56

CPC classification number: B01D53/945 ,  B01J21/063 ,  B01J21/066 ,  B01J23/58 ,  B01J35/0006 ,  B01J37/0238 ,  Y02T10/22

Abstract: A support for a catalyst for controlling vehicular exhaust emissions comprising a high surface area refractory metal oxide, e.g., gamma-alumina, having a monomolecular layer of a second oxide selected from the group consisting of titanium dioxide, cerium dioxide and zirconium dioxide. Typically, the monomolecular layer will have a thickness of less than about 10 angstroms. The support may be converted into a vehicular exhaust emission control catalyst by depositing the support on a substrate such as cordierite depositing a precious metal component such as platinum on at least part of the monomolecular layer. Preferably, the catalyst will also contain at least one NOx storage component deposited on at least part of the monomolecular layer. Catalysts prepared using the catalyst supports of the invention exhibit outstanding thermal stability and resistance to sulfur poisoning.

Abstract translation: 一种用于控制车辆废气排放的催化剂的载体，包括具有选自二氧化钛，二氧化铈和二氧化锆的第二氧化物的单分子层的高表面积难熔金属氧化物，例如γ-氧化铝。 通常，单分子层将具有小于约10埃的厚度。 载体可以通过在至少部分单分子层上沉积诸如堇青石的衬底上沉积诸如铂的贵金属组分的载体而转化为车辆废气排放控制催化剂。 优选地，催化剂还将含有至少一个沉积在单分子层的至少一部分上的NOx储存组分。 使用本发明的催化剂载体制备的催化剂表现出优异的热稳定性和耐硫中毒性。

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。