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    • 2. 发明授权
    • Nitrogen oxide storage catalyst
    • 氮氧化物储存催化剂
    • US06413904B1
    • 2002-07-02
    • US09417915
    • 1999-10-13
    • Wolfgang StrehlauUlrich GöbelRainer Domesle
    • Wolfgang StrehlauUlrich GöbelRainer Domesle
    • B01J2358
    • B01D53/9422B01D2255/1021B01D2255/1025B01D2255/202B01D2255/204B01D2255/2042B01D2255/2092B01D2255/407B01J23/58B01J23/63B01J27/053
    • 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.
    • 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。
    • 7. 发明授权
    • Process for coating the flow channels in a monolithic catalyst carrier with a coating dispersion
    • 用涂布分散体涂覆整体式催化剂载体中的流动通道的方法
    • US06627257B1
    • 2003-09-30
    • US09377157
    • 1999-08-19
    • Martin FoersterJosef PirothUlrich SchlachterRainer DomesleWilli Krampe
    • Martin FoersterJosef PirothUlrich SchlachterRainer DomesleWilli Krampe
    • B05D312
    • B01J37/0215
    • A process for coating the flow channels in a monolithic, cylindrically shaped catalyst carrier with a coating dispersion, wherein the carrier has two end faces which are connected to each other by flow channels arranged parallel to the axis of the cylinder, by vertically aligning the axis of the cylindrical carrier, placing a predetermined amount of coating dispersion from a storage container on the upper end face of the carrier and drawing the dispersion through the flow channels under suction, removing excess coating dispersion from the flow channels by emptying the flow channels under suction, returning the excess dispersion to the storage container and fixing the dispersion coating by calcination. The coating dispersion is drawn through the flow channels under suction at a rate of flow of 0.1 to 1 m/s and after completion of passage under suction the excess coating dispersion is removed from the flow channels by applying a suction impulse from below, wherein the suction air is drawn through the flow channels under suction at a rate of flow between 40 and 1 m/s and the excess coating dispersion discharged with the air stream is separated from the air stream within a time of less than 100 ms after discharge from the catalyst carrier.
    • 一种用于在具有涂层分散体的整体式圆柱形催化剂载体中涂覆流动通道的方法,其中载体具有两个端面,所述两个端面通过平行于圆柱体的轴线布置的流动通道彼此连接, 将预定量的涂布分散体从储存容器放置在载体的上端面上,并在抽吸下将分散体抽吸通过流动通道,通过在抽吸下排空流动通道从流动通道中除去多余的涂层分散体 将过量的分散体返回到储存容器中并通过煅烧固定分散涂层。 涂层分散体在抽吸下以0.1至1m / s的流速抽吸通过流动通道,并且在抽吸完成之后,通过从下方施加抽吸冲击从流动通道中除去多余的涂层分散体,其中 吸入空气以40〜1m / s之间的流量在吸入下被抽吸通过流动通道,并且在排出之后,在空气流中排出的过量涂层分散体在小于100ms的时间内与空气流分离 催化剂载体。