Structured SCR catalyst for the reduction of nitrogen oxides in the exhaust gas from lean-burn engines using ammonia as reducing agent
    14.
    发明授权
    Structured SCR catalyst for the reduction of nitrogen oxides in the exhaust gas from lean-burn engines using ammonia as reducing agent 有权
    用于使用氨作为还原剂从贫燃发动机的废气中还原氮氧化物的结构化SCR催化剂

    公开(公告)号:US08568678B2

    公开(公告)日:2013-10-29

    申请号:US12307696

    申请日:2007-06-06

    Abstract: The reductive removal of nitrogen oxides from the exhaust gas from internal combustion engines operated predominantly under lean conditionstakes place in a selective catalytic reduction (SCR) of the nitrogen oxides by means of ammonia or a compound which can be decomposed into ammonia as reducing agent. Conventional SCR catalysts typically have a relatively narrow working temperature window, usually 350° C. to 520° C., in which good nitrogen oxide conversions can be achieved with sufficient selectivity. SCR catalyst formulations whose working window is in the temperature range from 150° C. to 350° C. generally not be used at higher temperatures since they oxidize the ammonia required as reducing 18 agent to nitrogen oxides at above 350° C. To cover the entire exhaust gas temperature range typical of vehicles having been operating internal combustion enginesextending from 200° C. to 600° C., it has therefore mostly been necessary to use complicated exhaust gas systemscontaining a plurality of catalysts having different working temperature ranges. Disclosed is a structured SCR catalyst whose working range extends over a significantly broader temperature window and by means of which complicated exhaust gas units can be considerably simplified, with a saving of components.

    Abstract translation: 来自主要在贫态条件下运行的内燃机废气中的氮氧化物的还原去除通过氨或可分解成氨作为还原剂的化合物置于氮氧化物的选择性催化还原(SCR)中。 常规SCR催化剂通常具有相对窄的工作温度窗口,通常为350℃至520℃,其中可以以足够的选择性实现良好的氮氧化物转化。 工作窗口在150°C至350°C温度范围内的SCR催化剂配方通常不会在较高温度下使用,因为它们会将需要的氨氧化为在高于350°C的氮氧化物所需的氨。 已经运行内燃机的车辆的典型的整个排气温度范围从200℃升高到600℃,因此大多需要使用包含具有不同工作温度范围的多个催化剂的复杂的废气系统。 公开了一种结构化SCR催化剂,其工作范围在明显更宽的温度窗口上延伸,并且借助于这些SCR催化剂可以显着简化复杂的废气单元,同时节省了部件。

    Device for the purification of diesel exhaust gases
    15.
    发明授权
    Device for the purification of diesel exhaust gases 有权
    柴油机废气净化装置

    公开(公告)号:US08057768B2

    公开(公告)日:2011-11-15

    申请号:US12226857

    申请日:2008-10-23

    Abstract: The invention relates to a special device for the purification of diesel exhaust gases, which device comprises, in the flow direction of the exhaust gas, an oxidation catalyst, a diesel particle filter with catalytically active coating, and, downstream of a device for introducing a reducing agent from an external reducing agent source, an SCR catalyst. The oxidation catalyst and the catalytically active coating of the diesel particle filter contain palladium and platinum. The ratio of the noble metals platinum and palladium in the overall system and on the individual components, oxidation catalyst and catalytically coated diesel particle filter, are coordinated with one another in such a way as to obtain firstly an optimum NO/NO2 ratio in the exhaust gas upstream of the downstream SCR catalyst, and secondly optimum heating and HC conversion behaviour during an active particle filter regeneration.

    Abstract translation: 本发明涉及一种用于净化柴油机废气的专用装置,该装置在排气的流动方向上包括氧化催化剂,具有催化活性涂层的柴油颗粒过滤器,以及用于引入 还原剂来自外部还原剂源,SCR催化剂。 柴油颗粒过滤器的氧化催化剂和催化活性涂层含有钯和铂。 整个系统中的贵金属铂和钯与单个组分,氧化催化剂和催化涂层柴油颗粒过滤器的比例彼此协调,以便首先获得排气中最佳的NO / NO 2比例 下游SCR催化剂上游的气体,其次是活性颗粒过滤器再生过程中的最佳加热和HC转化行为。

    Process for operating a three-way catalyst that contains an oxygen-storage component

    公开(公告)号:US06655129B2

    公开(公告)日:2003-12-02

    申请号:US10056814

    申请日:2002-01-24

    Abstract: A process is provided for operating a three-way catalyst that contains an oxygen storage component, that has a minimum and a maximum filling degree for oxygen and that is located in the exhaust gas line of an internal combustion engine. The air/fuel mixture supplied to the engine is varied in such a way that the filling degree of the oxygen storage component in the catalyst is held within a set-point interval between the minimum and maximum filling degree. According to this process, in order to regulate the air/fuel mixture, migration of the filling degree out of the set-point interval is checked in a test phase in such a way that the filling degree is increased or lowered relative to the instantaneous value (initial value) by short-term enrichment or reduction in richness of the air/fuel mixture supplied to the engine by a certain amount and immediately returned to the initial value by a short-term opposing change in the air/fuel mixture (lean/rich pulse sequence or rich/lean pulse sequence). In the case of a breakthrough of lean or rich exhaust gas through the catalyst during the test phase, the air/fuel mixture is enriched or reduced in richness in order to correct the filling degree, wherein the amount by which the filling degree during the test phase is increased or decreased is such that no breakthrough of lean or rich exhaust gas takes place through the catalyst when the filling degree of the oxygen storage component is within the set-point interval.

    Catalyst material
    18.
    发明授权
    Catalyst material 有权
    催化剂材料

    公开(公告)号:US06475951B1

    公开(公告)日:2002-11-05

    申请号:US09513341

    申请日:2000-02-25

    Abstract: A powdered catalyst material based on aluminum oxide, which contains at least one basic metal oxide and at least one noble metal from the platinum group of the Periodic Table of Elements in addition to aluminum oxide. The catalyst material is obtainable by loading a support material already stabilized by basic oxides by renewed impregnation with further basic oxides. After drying and calcining this post-impregnated material at temperatures below 800° C., the catalytically active noble metals are also incorporated into the support material by impregnation.

    Abstract translation: 基于氧化铝的粉末状催化剂材料,其除了氧化铝之外还含有至少一种碱金属氧化物和至少一种来自元素周期表的铂族的贵金属。 催化剂材料可以通过用另外的碱性氧化物再次浸渍加载已经通过碱性氧化物稳定的载体材料而获得。 在低于800℃的温度下干燥和煅烧该浸渍后材料之后,催化活性的贵金属也通过浸渍掺入载体材料中。

    Device for the Purification of Diesel Exhaust Gases
    19.
    发明申请
    Device for the Purification of Diesel Exhaust Gases 有权
    柴油机排气净化装置

    公开(公告)号:US20100221161A1

    公开(公告)日:2010-09-02

    申请号:US12226857

    申请日:2008-10-23

    Abstract: The invention relates to a special device for the purification of diesel exhaust gases, which device comprises, in the flow direction of the exhaust gas, an oxidation catalyst, a diesel particle filter with catalytically active coating, and, downstream of a device for introducing a reducing agent from an external reducing agent source, an SCR catalyst. The oxidation catalyst and the catalytically active coating of the diesel particle filter contain palladium and platinum. The ratio of the noble metals platinum and palladium in the overall system and on the individual components, oxidation catalyst and catalytically coated diesel particle filter, are coordinated with one another in such a way as to obtain firstly an optimum NO/NO2 ratio in the exhaust gas upstream of the downstream SCR catalyst, and secondly optimum heating and HC conversion behaviour during an active particle filter regeneration.

    Abstract translation: 本发明涉及一种用于净化柴油机废气的专用装置,该装置在排气的流动方向上包括氧化催化剂,具有催化活性涂层的柴油颗粒过滤器,以及用于引入 还原剂来自外部还原剂源,SCR催化剂。 柴油颗粒过滤器的氧化催化剂和催化活性涂层含有钯和铂。 整个系统中的贵金属铂和钯与单个组分,氧化催化剂和催化涂层柴油颗粒过滤器的比例彼此协调,以便首先获得排气中最佳的NO / NO 2比例 下游SCR催化剂上游的气体,其次是活性颗粒过滤器再生过程中的最佳加热和HC转化行为。

    STRUCTURED SCR CATALYST FOR THE REDUCTION OF NITROGEN OXIDES IN THE EXHAUST GAS FROM LEAN-BURN ENGINES USING AMMONIA AS REDUCING AGENT
    20.
    发明申请
    STRUCTURED SCR CATALYST FOR THE REDUCTION OF NITROGEN OXIDES IN THE EXHAUST GAS FROM LEAN-BURN ENGINES USING AMMONIA AS REDUCING AGENT 有权
    结构化的SCR催化剂,用于减少来自使用氨基甲酸酯作为还原剂的精馏燃烧器的排气中的氮氧化物

    公开(公告)号:US20100209327A1

    公开(公告)日:2010-08-19

    申请号:US12307696

    申请日:2007-06-06

    Abstract: The reductive removal of nitrogen oxides from the exhaust gas from internal combustion engines operated predominantly under lean conditions takes place in a selective catalytic reduction (SCR) of the nitrogen oxides by means of ammonia or a compound which can be decomposed into ammonia as reducing agent. Conventional SCR catalysts typically have a relatively narrow working temperature window, usually 350° C. to 520° C., in which good nitrogen oxide conversions can be achieved with sufficient selectivity. SCR catalyst formulations whose working window is in the temperature range from 150° C. to 350° C. generally not be used at higher temperatures since they oxidize the ammonia required as reducing 18 agent to nitrogen oxides at above 350° C. To cover the entire exhaust gas temperature range typical of vehicles having been operating internal combustion engines extending from 200° C. to 600° C., it has therefore mostly been necessary to use complicated exhaust gas systems containing a plurality of catalysts having different working temperature ranges. Disclosed is a structured SCR catalyst whose working range extends over a significantly broader temperature window and by means of which complicated exhaust gas units can be considerably simplified, with a saving of components.

    Abstract translation: 来自主要在贫条件下运行的内燃机的废气中的氮氧化物的还原除去通过氨或可分解成氨作为还原剂的化合物在氮氧化物的选择性催化还原(SCR)中进行。 常规SCR催化剂通常具有相对窄的工作温度窗口,通常为350℃至520℃,其中可以以足够的选择性实现良好的氮氧化物转化。 工作窗口在150°C至350°C温度范围内的SCR催化剂配方通常不会在较高温度下使用,因为它们会将需要的氨氧化为在高于350°C的氮氧化物所需的氨。 已经运行内燃机的车辆的典型的整个排气温度范围从200℃延伸到600℃,因此大多需要使用包含具有不同工作温度范围的多个催化剂的复杂的废气系统。 公开了一种结构化SCR催化剂,其工作范围在明显更宽的温度窗口上延伸,并且借助于这些SCR催化剂可以显着简化复杂的废气单元,同时节省了部件。

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