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    Catalyst for cleaning up the exhaust gases of a diesel engine
    12.
    发明授权
    Catalyst for cleaning up the exhaust gases of a diesel engine 有权
    用于清洁柴油发动机废气的催化剂

    公开(公告)号：US06677264B1

    公开(公告)日：2004-01-13

    申请号：US09442633

    申请日：1999-11-18

    申请人： Harald Klein ,  Wolfgang Strehlau ,  Egbert Lox ,  Thomas Kreuzer ,  Wilfried Müller

    发明人： Harald Klein ,  Wolfgang Strehlau ,  Egbert Lox ,  Thomas Kreuzer ,  Wilfried Müller

    IPC分类号： B01J2116

    CPC分类号： B01D53/945 ,  B01J23/58 ,  B01J23/63 ,  B01J29/068 ,  B01J37/0244 ,  B01J37/0246 ,  F02B3/06 ,  Y02T10/22

    摘要： A catalyst for purifying exhaust gases of a diesel engine. The catalyst contains two functional layers superimposed on an inert supporting body, whereby the first layer, which is situated directly on the supporting body, has a nitrogen oxide storage function and the second layer, which is in direct contact with the exhaust gas, has a catalytic function. The second functional layer additionally has a hydrocarbon-storage function and its catalytic function is provided by catalytically active noble metals of the platinum group which are deposited in highly dispersed form on finely divided, acidic carrier materials. Nitrogen oxides in the oxygen-rich exhaust gas of a diesel engine can be converted with optimal utilization of the reductive constituents contained in the exhaust gas. For this purpose, no reducing agents going beyond the reductive components (carbon monoxide and hydrocarbons) which are contained as a consequence of incomplete combustion need to be added to the exhaust gas. Nevertheless, rates of conversion in respect of the nitrogen oxides are obtained, averaged over practical driving cycles, which lie distinctly above the rates of conversion of conventional reduction catalysts.

    摘要翻译： 一种用于净化柴油发动机废气的催化剂。 催化剂含有叠置在惰性支撑体上的两个功能层，由此直接位于支撑体上的第一层具有氮氧化物存储功能，与废气直接接触的第二层具有 催化功能。 第二功能层另外具有烃储存功能，其催化功能由铂组的催化活性贵金属提供，其以高度分散形式沉积在细分的酸性载体材料上。 柴油发动机的富氧废气中的氮氧化物可以通过废气中所含的还原成分的最佳利用来转化。 为此，不需要在排气中加入超过由于不完全燃烧而含有的还原成分（一氧化碳和碳氢化合物）的还原剂。 然而，获得了关于氮氧化物的转化率，在实际的驱动循环中是平均的，其明显高于常规还原催化剂的转化速率。

    Process for operating an exhaust gas treatment unit containing a sulfur trap and a nitrogen oxides storage catalyst
    13.
    发明授权
    Process for operating an exhaust gas treatment unit containing a sulfur trap and a nitrogen oxides storage catalyst 有权
    用于操作含有硫捕集器和氮氧化物储存催化剂的排气处理单元的方法

    公开(公告)号：US06145303A

    公开(公告)日：2000-11-14

    申请号：US276131

    申请日：1999-03-25

    申请人： Wolfgang Strehlau ,  Ulrich Gobel ,  Egbert Lox ,  Wilfried Muller ,  Rainer Domesle

    发明人： Wolfgang Strehlau ,  Ulrich Gobel ,  Egbert Lox ,  Wilfried Muller ,  Rainer Domesle

    IPC分类号： B01D53/86 ,  B01D53/94 ,  B01J21/16 ,  F01N3/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N9/00 ,  F01N13/02 ,  F02D41/14 ,  F01N3/00 ,  B01D47/00

    CPC分类号： B01D53/9422 ,  B01D53/949 ,  F01N13/009 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/085 ,  F01N3/0871 ,  B01D2255/102 ,  B01D2255/202 ,  B01D2255/204 ,  B01D2255/2061 ,  B01D2255/2063 ,  B01D2255/91 ,  F01N2340/02 ,  Y02T10/22

    摘要： A process is disclosed for operating an exhaust gas treatment unit for an internal combustion engine which is operated with lean normalized air/fuel ratios over most of the operating period. The exhaust gas treatment unit contains a nitrogen oxides storage catalyst with an activity window .DELTA.T.sub.NOX for the storage of nitrogen oxides at normalized air/fuel ratios of greater than 1 and release of the nitrogen oxides at normalized air/fuel ratios of less than or equal to 1 and a sulfur trap, located upstream of the nitrogen oxides storage catalyst, with a sulfur desorption temperature T.sub.S,DeSOx above which the sulfates stored on the sulfur trap are decomposed at normalized air/fuel ratios of less than or equal to 1. The nitrogen oxides contained in the exhaust gas are stored on the nitrogen oxides storage catalyst and the sulfur oxides are stored on the sulfur trap at normalized air/fuel ratios greater than 1 and exhaust gas temperatures T.sub.K within the activity window T.sub.NOX, wherein at the same time the exhaust gas temperature just upstream of the sulfur trap is lower than its sulfur desorption temperature T.sub.S,DeSOx. By cyclic lowering of the normalized air/fuel ratio in the exhaust gas to less than 1 the stored nitrogen oxides are released again from the storage catalyst. After each predetermined number N.sub.1 of nitrogen oxides storage cycles, sulfur is removed from the sulfur trap. This takes place by raising the exhaust gas temperature just upstream of the sulfur trap to above its sulfur desorption temperature T.sub.S,DeSOx and also lowering the normalized air/fuel ratio in the exhaust gas to less than 1.

    摘要翻译： 公开了一种用于操作用于内燃机的排气处理单元的方法，该内燃机在大部分操作周期内以精简的归一化空气/燃料比操作。 废气处理单元包含具有活性窗口DELTA TNOX的氮氧化物存储催化剂，用于在标准化的空气/燃料比大于1时储存氮氧化物，并且在标准化的空气/燃料比小于或等于 至1和位于氮氧化物储存催化剂上游的硫捕集器，具有硫解吸温度TS，DeSOx，其上储存在硫阱上的硫酸盐在标准化的空气/燃料比小于或等于1时分解。 废气中含有的氮氧化物被储存在氮氧化物储存催化剂上，硫氧化物以规定的大于1的空气/燃料比和废气温度TK存储在活性窗口TNOX内，其中同时 硫阱的上游排气温度低于其脱硫温度TS，DeSOx。 通过将排气中的归一化空气/燃料比循环降低到小于1，储存的氮氧化物再次从储存催化剂释放。 在氮氧化物存储循环的每个预定数量的N1之后，从硫阱中除去硫。 这通过将硫捕集器正好上游的废气温度提高到高于其硫解吸温度TS，DeSOx并且将排气中的归一化空气/燃料比降至小于1来进行。

    Process for evaluating performance deterioration of a nitrogen oxide storage catalyst
    16.
    发明授权
    Process for evaluating performance deterioration of a nitrogen oxide storage catalyst 有权
    用于评估氮氧化物存储催化剂的性能劣化的方法

    公开(公告)号：US06216449B1

    公开(公告)日：2001-04-17

    申请号：US09288075

    申请日：1999-04-08

    申请人： Wolfgang Strehlau ,  Lothar Mussmann ,  Ulrich Göbel

    发明人： Wolfgang Strehlau ,  Lothar Mussmann ,  Ulrich Göbel

    IPC分类号： F01N300

    CPC分类号： F01N3/0814 ,  B01D53/9495 ,  F01N3/0807 ,  F01N3/0842 ,  F01N3/0864 ,  F01N11/007 ,  F01N2550/03 ,  F01N2570/16 ,  F01N2900/0422 ,  F02D41/0235 ,  F02D41/1441 ,  F02D41/1456 ,  F02D2200/0808 ,  F02D2200/0816 ,  Y02T10/47

    摘要： A process for evaluating performance deterioration of a nitrogen oxide storage catalyst which has a nitrogen oxide storage function and an oxygen storage function and is operated with cyclic alternation of the air/fuel ratio in the exhaust gas from lean to rich. The nitrogen oxides are stored during the lean phase and the nitrogen oxides are desorbed and converted during the rich phase. To check the serviceability of the storage catalyst, the air/fuel ratio of the exhaust gas is switched from lean to rich and the rich phase is extended beyond the time required for complete desorption of the nitrogen oxides until at least the rich exhaust gas passes right through the catalyst and the time interval &Dgr;t1 produced between the first change-over until breakthrough of the rich exhaust gas and, after again switching from rich to lean running, the time interval &Dgr;t2 produced between the second change-over and passage of oxygen through the catalyst are measured and the time differences &Dgr;t1 and &Dgr;t2 are used for separate assessment of the oxygen storage function and the nitrogen oxide storage function of the catalyst.

    摘要翻译： 一种用于评估具有氮氧化物存储功能和储氧功能的氮氧化物存储催化剂的性能劣化的方法，并且在废气中的空气/燃料比的循环交替从贫到富运行。 氮氧化物在稀相期间储存，氮氧化物在富相期间解吸和转化。 为了检查储存催化剂的使用性能，废气的空气/燃料比从稀释转为富，富相扩展到氮氧化物完全解吸所需的时间，直到至少富排气向右流动 通过催化剂和在第一次转换之间产生的时间间隔DELTAt1直到富排气的突破之间，并且在再次从富运行切换到稀薄运行之后，在氧气通过第二转换和通过之间产生的时间间隔DELTAt2 测量催化剂，并将时间差DELTAt1和DELTAt2用于分离评估催化剂的储氧功能和氮氧化物储存功能。

    Nitrogen oxide storage catalyst
    19.
    发明授权
    Nitrogen oxide storage catalyst 有权
    氮氧化物储存催化剂

    公开(公告)号：US06413904B1

    公开(公告)日：2002-07-02

    申请号：US09417915

    申请日：1999-10-13

    申请人： Wolfgang Strehlau ,  Ulrich Göbel ,  Rainer Domesle

    发明人： Wolfgang Strehlau ,  Ulrich Göbel ,  Rainer Domesle

    IPC分类号： B01J2358

    CPC分类号： B01D53/9422 ,  B01D2255/1021 ,  B01D2255/1025 ,  B01D2255/202 ,  B01D2255/204 ,  B01D2255/2042 ,  B01D2255/2092 ,  B01D2255/407 ,  B01J23/58 ,  B01J23/63 ,  B01J27/053

    摘要： A nitrogen oxide storage catalyst which contains at least one catalyst material and at least one nitrogen oxide storage component from the group of alkali and alkaline earth metals. The nitrogen oxide storage component, after completing catalyst preparation, is present as finely divided barium sulfate, strontium sulfate, a mixture or mixed crystals of the two sulfates, or as their complete or incomplete decomposition product with an average particle size of less than 1 &mgr;m. Barium sulfate and/or strontium sulfate act as feed materials for the active storage component in the storage catalyst according to the invention. As a result of the reductive exhaust gas compositions occurring under normal automobile driving conditions barium sulfate and strontium sulfate decompose to compounds which are able to store nitrogen oxides. This compensates for the loss of active storage components which occurs due to aging. Barium sulfate and/or strontium sulfate may be decomposed during production by means of reductive calcination in order to obtain a high initial loading of the catalyst with storage compounds. In this case, these sulfates are used as auxiliary agents in order to introduce the highest possible concentrations of storage compounds into the storage catalyst.

    摘要翻译： 含有至少一种催化剂材料和至少一种来自碱金属和碱土金属组的氮氧化物储存组分的氮氧化物储存催化剂。 完成催化剂制备后，氮氧化物储存组分以细碎的硫酸钡，硫酸锶，两种硫酸盐的混合物或混合物形式存在，或作为其完全或不完全的分解产物，平均粒度小于1um 。 硫酸钡和/或硫酸锶作为根据本发明的储存催化剂中的活性储存组分的进料。 由于在正常的汽车驾驶条件下发生的还原废气组合物的结果是硫酸钡和硫酸锶分解成能够存储氮氧化物的化合物。 这补偿了由于老化而发生的主动存储组件的损失。 硫酸钡和/或硫酸锶可以通过还原煅烧在生产过程中分解，以便用储存化合物获得催化剂的初始负载量。 在这种情况下，这些硫酸盐用作辅助剂，以便将最高可能浓度的储存化合物引入储存催化剂中。

    Storage material for sulfur oxides
    20.
    发明授权
    Storage material for sulfur oxides 有权
    硫氧化物的储存材料

    公开(公告)号：US06338831B1

    公开(公告)日：2002-01-15

    申请号：US09276903

    申请日：1999-03-26

    申请人： Wolfgang Strehlau ,  Ulrich Göbel ,  Rainer Domesle ,  Egbert Lox ,  Thomas Kreuzer

    发明人： Wolfgang Strehlau ,  Ulrich Göbel ,  Rainer Domesle ,  Egbert Lox ,  Thomas Kreuzer

    IPC分类号： B01D5350

    CPC分类号： B01J20/08 ,  B01D53/508 ,  B01D53/94 ,  B01J20/041 ,  B01J20/28042 ,  B01J20/28057 ,  B01J20/3078 ,  B01J20/3204 ,  B01J20/3236

    摘要： A sulfur oxide storage material contains a magnesium-aluminum spinel (MgO.Al2O3) and can be used as a so-called “sulfur trap” to remove sulfur oxides from oxygen-containing exhaust gases of industrial processes. In particular, it can be used for the catalytic purification of exhaust gas from internal-combustion engines to remove the sulfur oxides from the exhaust gas in order to protect the exhaust gas catalysts from sulfur poisoning. The material displays a molar ratio of magnesium oxide to aluminum oxide in the range of over 1.1:1, and the magnesium oxide present in stoichiometric excess is homogeneously distributed in a highly disperse form in the storage material.

    摘要翻译： 硫氧化物储存材料含有镁 - 铝尖晶石（MgO·Al 2 O 3），并且可以用作所谓的“硫阱”，以从工业过程的含氧废气中除去硫氧化物。 特别地，其可以用于从内燃机排出的废气的催化净化，以从废气中除去硫氧化物，以保护废气催化剂免受硫中毒。 该材料显示氧化铝与氧化铝的摩尔比在1.1:1以上，以化学计量过量存在的氧化镁以高分散形式均匀地分布在储存材料中。