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    Catalyst for purifying exhaust gas, process for manufacturing the catalyst and process for making use of the catalyst
    1.
    发明公开
    Catalyst for purifying exhaust gas, process for manufacturing the catalyst and process for making use of the catalyst 失效
    催化剂的废气净化，制作方法和使用该催化剂的

    公开(公告)号：EP0868940A1

    公开(公告)日：1998-10-07

    申请号：EP98105891.0

    申请日：1998-03-31

    申请人： MAZDA MOTOR CORPORATION

    发明人： Kurokawa, Takahiro ,  Ueda, Toshitsugu ,  Kyogoku, Makoto ,  Okamoto, Kenki ,  Takami, Akihide ,  Watanabe, Yasuto

    IPC分类号： B01D53/94

    CPC分类号： B01D53/945 ,  B01J37/0246 ,  Y02A50/2324 ,  Y02T10/22

    摘要： An object of the invention is to provide a catalyst for purifying sufficiently both NOx at high exhaust gas temperature and HC and CO at low exhaust gas temperature in using engines normally operated with excess air such as diesel or lean-burn engine.
    The catalyst comprises the following two types of catalysts in the form of mixture or double layers supported on a honeycomb substrate; (a) a first type zeolite catalyst in which the active metal becomes supported on the zeolite by ion-exchange process and (b) a second type zeolite catalyst in which the active metal becomes supported on the zeolite by other process than ion-exchange. At high exhaust gas temperature, the first type zeolite catalyst converts paraffin type HC and/or olefin type HC into aromatic HC. The second type zeolite catalyst can reduce NOx into N 2 by making use of the aromatic HC as a reductant remaining in the gas even at high temperature.
    At low exhaust gas temperature, the first type zeolite catalyst converts a medium size (medium carbon number ) aromatic HC into a small size olefin type HC (cracking ) and the second type zeolite catalyst can rapidly oxidize the small size olefin type HC to form H 2 O and CO 2 . As a whole the catalyst gains a performance improvement in both purification of NOx at high temperature and its activity at low temperature.

    摘要翻译： 本发明的一个目的是提供用于在高废气温度和HC和CO在使用发动机通常与过量的空气充分地操作两个NOx净化在低排气温度提供催化剂：如柴油或贫油燃烧发动机。 该催化剂包括下列两种类型的混合物或负载于蜂窝状基材双层的形式的催化剂; （A）第一种类型的沸石催化剂，其中所述活性金属变为支撑在通过离子交换过程和（b）第二类型的沸石催化剂的沸石，其中活性金属变为支撑在比离子交换等处理的沸石。 在高废气温度，所述第一类型的沸石催化剂石蜡型HC和/或烯烃型HC转化为芳族HC转换。 第二种类型的沸石催化剂可以通过使用芳香族HC的作为即使在高温下残留在气体中的还原剂减少NOx还原成N2。 在低排气温度，所述第一类型的沸石催化剂的中等大小的（介质碳数）芳香族HC为小尺寸的烯烃型HC转换（裂化）和第二类型的沸石催化剂可快速氧化的小尺寸烯烃型HC以形成H 2 O 和CO2。 作为一个整体的催化剂获得在高温下的NO x的两个纯化和其在低温下活性的性能改进。

    Exhaust gas purifying catalyst and process of producing the same
    2.
    发明公开
    Exhaust gas purifying catalyst and process of producing the same 有权
    Katalysator zur Reinigung von Abgas und Verfahrenfürseine Herstellung

    公开(公告)号：EP0895812A1

    公开(公告)日：1999-02-10

    申请号：EP98114817.4

    申请日：1998-08-06

    申请人： Mazda Motor Corporation

    发明人： Kurokawa, Takahiro ,  Watanabe, Yasuto ,  Ueoka, Toshitsugu ,  Takayama, Osamu ,  Koda, Yuki

    IPC分类号： B01J37/02 ,  B01J29/06 ,  B01J29/03 ,  B01D53/94

    CPC分类号： B01D53/945 ,  B01J29/061 ,  B01J37/0244 ,  B01J37/0246 ,  Y02A50/2324 ,  Y02T10/22

    摘要： An exhaust gas purifying catalyst is comprised of a mixture of a meso-porous composite having an approximately uniform size of meso-pores and, if desirable, supporting ceria thereon and a catalytic component of an active metal supported on zeolite by an ion-exchanged method or comprised of an under layer of a meso-porous composite having an approximately uniform size of meso-pores and, if desirable, supporting ceria thereon and an over layer of a catalytic component of an active metal supported on zeolite by an ion-exchanged method.

    摘要翻译： 废气净化催化剂由具有大致均匀尺寸的中孔的中孔多孔复合材料的混合物组成，并且如果需要的话，在其上支撑二氧化铈和通过离子交换法负载在沸石上的活性金属的催化组分 或由具有近似均匀尺寸的中孔的中孔多孔复合材料的底层组成，并且如果需要的话，在其上支撑二氧化铈和通过离子交换法负载在沸石上的活性金属的催化组分的上层 。

    Combustion engine exhaust purifying catalyst
    5.
    发明公开
    Combustion engine exhaust purifying catalyst 有权
    Abgasreinigungskatalysatorfüreine Brennkraftmaschine

    公开(公告)号：EP0922485A2

    公开(公告)日：1999-06-16

    申请号：EP98123451.1

    申请日：1998-12-11

    申请人： MAZDA MOTOR CORPORATION

    发明人： Kurokawa, Takahiro ,  Watanabe, Yasuto ,  Ueoka, Toshitsugu ,  Murakami, Hiroshi

    IPC分类号： B01D53/94 ,  B01J29/06 ,  B01J23/10

    CPC分类号： B01D53/9454 ,  B01J37/0244 ,  B01J37/0246 ,  Y02T10/22

    摘要： In an exhaust gas purifying catalyst according to the present invention, an inner catalytic layer 3 and an outer catalytic layer 4 are disposed on a surface of a substratum 2. Hereupon, the inner catalytic layer 3 includes ceria 5. On the other hand, the outer catalytic layer 4 includes a catalyst in which Pt 7 is supported on zeolite 6 by ion exchange process. Thus, there is provided a catalyst which can effectively purify NOx in exhaust gas under the condition of so-called lean atmosphere in which oxygen concentration in the exhaust gas is higher than that corresponding to theoretical air-fuel ratio, without using so much amount of expansive materials.

    摘要翻译： 在本发明的废气净化用催化剂中，内层催化剂层3和外层催化剂层4配置在基材2的表面上。此外，内层催化剂层3包括二氧化铈5.另一方面， 外部催化剂层4包括通过离子交换方法将Pt 7负载在沸石6上的催化剂。 因此，提供了一种催化剂，其能够在排气中的氧浓度高于理论空燃比的所谓贫气氛的条件下有效地净化废气中的NOx，而不需要使用大量的 膨胀材料

    Combustion engine exhaust purifying catalyst
    10.
    发明公开
    Combustion engine exhaust purifying catalyst 有权
    一种用于内燃发动机的废气净化催化剂

    公开(公告)号：EP0922485A3

    公开(公告)日：2000-02-09

    申请号：EP98123451.1

    申请日：1998-12-11

    申请人： MAZDA MOTOR CORPORATION

    发明人： Kurokawa, Takahiro ,  Watanabe, Yasuto ,  Ueoka, Toshitsugu ,  Murakami, Hiroshi

    IPC分类号： B01D53/94 ,  B01J29/06 ,  B01J23/10

    CPC分类号： B01D53/9454 ,  B01J37/0244 ,  B01J37/0246 ,  Y02T10/22

    摘要： In an exhaust gas purifying catalyst according to the present invention, an inner catalytic layer 3 and an outer catalytic layer 4 are disposed on a surface of a substratum 2. Hereupon, the inner catalytic layer 3 includes ceria 5. On the other hand, the outer catalytic layer 4 includes a catalyst in which Pt 7 is supported on zeolite 6 by ion exchange process. Thus, there is provided a catalyst which can effectively purify NOx in exhaust gas under the condition of so-called lean atmosphere in which oxygen concentration in the exhaust gas is higher than that corresponding to theoretical air-fuel ratio, without using so much amount of expansive materials.