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    SOx trap for enhancing NOx trap performance and methods of making and using the same
    1.
    发明申请
    SOx trap for enhancing NOx trap performance and methods of making and using the same 审中-公开
    用于提高NOx捕集阱性能的SOx捕集阱及其制造和使用方法

    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。

    Close coupled catalyst
    2.
    发明申请
    Close coupled catalyst 审中-公开
    闭合催化剂

    公开(公告)号：US20010036432A1

    公开(公告)日：2001-11-01

    申请号：US09848984

    申请日：2001-05-04

    Applicant: ENGELHARD CORPORATION

    Inventor： Zhicheng Hu ,  Ronald M. Heck ,  Harold N. Rabinowitz

    IPC: B01D053/92 ,  B01J023/44 ,  B01J023/10

    CPC classification number: B01D53/945 ,  B01D2255/908 ,  B01J23/58 ,  F01N3/0864 ,  F01N3/2828 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N2370/00 ,  F02B1/04 ,  Y02T10/22

    Abstract: A stable, close-coupled catalyst, an article comprising the close-coupled catalyst and a related method of operation. The close-coupled catalyst comprises a catalyst support and a palladium catalytic component. Preferably and optionally, there are stabilizers including alkaline metal oxide, and rare earth metal components selected from the neodymium and lanthanum components. The close-coupled catalyst composition includes substantially no additional oxygen storage component such as praseodymium or cerium compounds. There is preferably a catalyst such as a three-way catalyst downstream of the close-coupled catalyst. The downstream catalyst preferably includes an oxygen storage component such as cerium oxide or praseodymium oxide.

    Abstract translation: 稳定的紧密耦合的催化剂，包含紧密耦合催化剂的物品和相关的操作方法。 紧密耦合的催化剂包括催化剂载体和钯催化组分。 优选和任选地，存在稳定剂，包括碱金属氧化物和选自钕和镧组分的稀土金属组分。 紧密耦合的催化剂组合物基本上不含另外的储氧组分如镨或铈化合物。 优选催化剂，例如紧密耦合的催化剂下游的三元催化剂。 下游催化剂​​优选包括氧存储组分如氧化铈或氧化镨。

    Catalyst support
    4.
    发明申请
    Catalyst support 失效
    催化剂支持

    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。

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