Minimization of purge NOx release from NOx traps by optimizing the oxygen storage capacity
    8.
    发明授权
    Minimization of purge NOx release from NOx traps by optimizing the oxygen storage capacity 有权
    通过优化氧气存储容量,最大限度地减少NOx捕集器的NOx排放

    公开(公告)号:US07238640B2

    公开(公告)日:2007-07-03

    申请号:US10707659

    申请日:2003-12-30

    IPC分类号: B01J23/00 B01J21/00 B01J20/00

    摘要: The present invention provides a catalyst for use in a NOx trap that has reduced NOx release during rich purges, increased NO conversion efficiency under stoichiometric conditions, and improved sulfur tolerance. The catalyst of this embodiment includes a precious metal, an oxygen storage component in contact with the precious metal, and a NOx storage material. The oxygen storage component in contact with the precious metal is present in an amount that provides sufficient oxygen storage capacity to reduce the NOx release from the NOx trap during rich purges to less than 20% of the NOx that is stored in the NOx trap across the operating temperature window of the NOx trap, increase the NOx conversion efficiency under stoichiometric conditions to a value greater than 70%, and increase the sulfur tolerance of the NOx trap.

    摘要翻译: 本发明提供了一种用于在富集清洗期间减少NO x释放,在化学计量条件下提高NO转化效率和改善硫耐受性的NO X阱捕集器中的催化剂。 该实施方案的催化剂包括贵金属,与贵金属接触的储氧组分和NO x X存储材料。 与贵金属接触的储氧组分以提供足够的储氧能力的量存在,以便在富含清洗期间将NO x 2+释放从NO X 2捕集器中减少至 在NO 陷阱的工作温度窗口中存储在NO 陷阱中的小于20%的NO 增加了 在化学计量条件下的转化效率为大于70%的值,并且增加了NO x陷阱的耐硫性。

    PROCESSING METHODS AND FORMULATIONS TO ENHANCE STABILITY OF LEAN-NOx-TRAP CATALYSTS BASED ON ALKALI- AND ALKALINE-EARTH-METAL COMPOUNDS
    9.
    发明申请
    PROCESSING METHODS AND FORMULATIONS TO ENHANCE STABILITY OF LEAN-NOx-TRAP CATALYSTS BASED ON ALKALI- AND ALKALINE-EARTH-METAL COMPOUNDS 审中-公开
    基于碱金属和碱土金属化合物的提高NOx-捕捉催化剂稳定性的加工方法和配方

    公开(公告)号:US20060035782A1

    公开(公告)日:2006-02-16

    申请号:US10710920

    申请日:2004-08-12

    IPC分类号: B01J23/10 B01J31/00

    摘要: The present invention provides a coarsening resistant automotive exhaust catalyst composition. The composition of the invention comprises a metal or metal-containing compound and a component having alkali metal or an alkaline-earth metal ions bonded to a conjugate base oxide of an inorganic acid. The inorganic acid for which the base oxide is conjugate has a Ka such that the automotive exhaust catalyst composition resists phase transitions that reduce surface area. The present invention also provides a NOx trap which incorporates the exhaust catalyst composition of the invention. Finally, a method of inhibiting coarsening in automotive exhaust catalyst is also provided.

    摘要翻译: 本发明提供一种抗粗化的汽车尾气催化剂组合物。 本发明的组合物包含含金属或含金属的化合物和具有与无机酸的共轭基础氧化物结合的碱金属或碱土金属离子的成分。 基础氧化物共轭的无机酸具有Ka,使得汽车排气催化剂组合物抵抗减少表面积的相变。 本发明还提供一种纳入本发明的排气催化剂组合物的NOx捕集器。 最后,还提供了一种抑制汽车尾气催化剂粗化的方法。

    METHODS AND FORMULATIONS FOR ENHANCING NH3 ADSORPTION CAPACITY OF SELECTIVE CATALYTIC REDUCTION CATALYSTS
    10.
    发明申请
    METHODS AND FORMULATIONS FOR ENHANCING NH3 ADSORPTION CAPACITY OF SELECTIVE CATALYTIC REDUCTION CATALYSTS 有权
    提高选择性催化还原催化剂NH3吸附容量的方法和配方

    公开(公告)号:US20110003682A1

    公开(公告)日:2011-01-06

    申请号:US12884690

    申请日:2010-09-17

    IPC分类号: B01J23/10 B01J21/08

    摘要: A method of providing an automobile exhaust catalyst composition. The method includes acidifying a support composition with a conjugate base oxide of an inorganic acid having a Ka to obtain an acidified support exhaust catalyst composition. The support composition includes a combination of a cerium-containing oxide compound and non-cerium-containing compound selected from the group consisting of alkali metal containing compounds, alkaline-earth metal containing compounds and combinations thereof.

    摘要翻译: 一种提供汽车尾气催化剂组合物的方法。 该方法包括用具有Ka的无机酸的共轭基础氧化物酸化载体组合物以获得酸化的载体排出催化剂组合物。 载体组合物包括选自含碱金属化合物,含碱土金属化合物及其组合的含铈氧化物化合物和非含铈化合物的组合。