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    Catalyst support and catalyst and process for producing the same
    8.
    发明授权
    Catalyst support and catalyst and process for producing the same 失效
    催化剂载体和催化剂及其制备方法

    公开(公告)号：US06221805B1

    公开(公告)日：2001-04-24

    申请号：US09256234

    申请日：1999-02-24

    申请人： Koichi Yamashita ,  Shinji Tsuji ,  Naoto Miyoshi ,  Oji Kuno ,  Masahiko Sugiyama ,  Kazumasa Takatori ,  Takao Tani ,  Nobuo Kamiya

    发明人： Koichi Yamashita ,  Shinji Tsuji ,  Naoto Miyoshi ,  Oji Kuno ,  Masahiko Sugiyama ,  Kazumasa Takatori ,  Takao Tani ,  Nobuo Kamiya

    IPC分类号： B01J2304

    CPC分类号： B01D53/945 ,  B01J21/04 ,  B01J37/0045 ,  B01J37/0236 ,  Y02T10/22

    摘要： A catalyst support, a catalyst using the catalyst support and a process for producing the same are disclosed. For instance, the catalyst support includes a composite oxide powder produced by spraying and burning a W/O type emulsion, the W/O type emulsion including an aqueous solution dispersed in an organic solvent, the aqueous solution containing aluminum as a major component and at least one co-metallic element in addition to the aluminum. Thus, the catalyst support can be produced less expensively without using any expensive alkoxide. Further, due to the spraying and burning, the composite oxide powder is composed of porous hollow particles which have a very thin shell thickness of dozens of nanometers, and makes the catalyst support which is amorphous and exhibits a large specific surface area. Hence, the catalyst support can maintain the large specific surface area even after a high-temperature durability test. Furthermore, the composite oxide powder includes the co-metallic element which is composited in such a highly dispersed manner that the agglomerated sulfates are less likely to be produced. Therefore, the catalyst support is inhibited from being poisoned by sulfur.

    摘要翻译： 公开了催化剂载体，使用催化剂载体的催化剂及其制备方法。 例如，催化剂载体包括通过喷雾和燃烧W / O型乳液而制备的复合氧化物粉末，W / O型乳液包括分散在有机溶剂中的水溶液，含有铝作为主要成分的水溶液， 除了铝之外还有至少一种共金属元素。 因此，不用任何昂贵的醇盐就可以不昂贵地生产催化剂载体。 此外，由于喷涂和燃烧，复合氧化物粉末由具有非常薄的几十纳米的壳厚度的多孔中空颗粒组成，并使催化剂载体是无定形的并且具有大的比表面积。 因此，即使在高温耐久试验之后，催化剂载体也能保持较大的比表面积。 此外，复合氧化物粉末包括以非常分散的方式复合的共金属元素，使得不太可能生产聚集的硫酸盐。 因此，抑制催化剂载体被硫中毒。

    Catalyst for purifying exhaust gases
    9.
    发明授权
    Catalyst for purifying exhaust gases 失效
    废气净化催化剂

    公开(公告)号：US06217831B1

    公开(公告)日：2001-04-17

    申请号：US08909049

    申请日：1997-08-11

    申请人： Hiromasa Suzuki ,  Naoto Miyoshi

    发明人： Hiromasa Suzuki ,  Naoto Miyoshi

    IPC分类号： B01D5360

    CPC分类号： B01D53/945 ,  B01D2255/2042 ,  B01D2255/2073 ,  B01D2255/20738 ,  B01D2255/20746 ,  B01D2255/20753 ,  B01D2255/20761 ,  B01D2255/91 ,  Y02T10/22

    摘要： A catalyst for purifying exhaust gases which aims to efficiently purify NOx in exhaust gases in oxygen-rich atmospheres whose oxygen concentrations are more than required for oxidizing CO and HC, and to attain improved NOx purifying performance after used for a long time. The catalyst includes, being arranged in an order from the upstream to the downstream of exhaust gas flow, a first catalyst 1 in which a noble metal catalyst 12 is loaded on a porous acidic support, a second catalyst 2 in which at least one kind of metal 22 selected from the group consisting of alkali metals, alkaline-earth metals, and rare earth metals is loaded on a porous support, and a third catalyst 3 in which a noble metal catalyst 32 is loaded on a porous support. Since SO2 is not adsorbed or oxidized by the first catalyst 1, SO2 is discharged downstream from the second catalyst 2 without generating sulfate. Therefore, since the NOx absorber is free from degradation even after used for a long time, the second catalyst 2 maintains high NOx adsorbing performance on the fuel-lean side, and the third catalyst 3 reduces NOx which are emitted from the second catalyst 2 on the stoichiometric point or on the fuel-rich side.

    摘要翻译： 一种用于净化废气的催化剂，其目的是有效地净化氧浓度超过氧化CO和HC所需氧浓度的富氧气氛中的废气中的NOx，并且在长时间使用后获得改善的NOx净化性能。 催化剂包括从排气流的上游到下游的顺序排列有第一催化剂1，其中贵金属催化剂12负载在多孔酸性载体上，第二催化剂2，其中至少一种 将由碱金属，碱土金属和稀土类金属组成的组中选择的金属22负载在多孔载体上，在其上添加贵金属催化剂32的第三催化剂3。 由于SO 2不被第一催化剂1吸附或氧化，所以在不产生硫酸盐的情况下将SO 2从第二催化剂2的下游排出。 因此，即使长时间使用NOx吸收剂也不会劣化，所以第二催化剂2在燃料贫乏侧保持高NOx吸附性能，第三催化剂3将从第二催化剂2排出的NOx还原 化学计量点或富燃料侧。

    Alloy catalyst and process for producing the same
    10.
    发明授权
    Alloy catalyst and process for producing the same 失效
    合金催化剂及其制备方法

    公开(公告)号：US6147027A

    公开(公告)日：2000-11-14

    申请号：US114968

    申请日：1998-07-14

    申请人： Yoshiharu Miyake ,  Naoto Miyoshi ,  Shinji Tsuji

    发明人： Yoshiharu Miyake ,  Naoto Miyoshi ,  Shinji Tsuji

    IPC分类号： B01D53/94 ,  B01J23/38 ,  B01J23/40 ,  B01J37/02 ,  B01J37/03 ,  B01J37/16 ,  B01J23/00

    CPC分类号： B01D53/945 ,  B01J23/38 ,  B01J23/40 ,  B01J37/0221 ,  B01J37/031 ,  Y02T10/22

    摘要： The present invention relates to an alloy catalyst for purifying an exhaust gas, and particularly provides an alloy catalyst excellent in nitrogen oxide purification characteristics in the lean region by improving the catalytic activity by coating first catalytic metal particles with a second metal coagulated phase, and a process for producing the same, the alloy catalyst for purifying an exhaust gas having a structure in which metal coagulated phases being applied to and supported by a metal oxide, and comprising first catalytic metal particles having an average particle size of up to 30 nm, and a second metal coagulated phase containing at least one metal, differing from the catalytic metal particles, and applying to the first catalytic metal particles at a coating ratio of at least 45%, and the process for producing an alloy catalyst for purifying an exhaust gas, comprising the steps of allowing first catalytic metal particles having an average particle size of up to 30 nm to adhere onto a metal oxide, and reduction precipitating a second metal coagulated phase containing at least one metal differing from the first catalytic metal particles thereon, and comprising at least one metal selected from the group consisting of Pt, Pd, Au, Rh, Ag and Ir.

    摘要翻译： 本发明涉及一种用于净化废气的合金催化剂，特别是通过用第二金属凝固相涂覆第一催化金属颗粒来提高催化活性，从而提供贫区中氮氧化物净化特性优异的合金催化剂， 制造该金属氧化物的金属凝固相的金属凝固相的结构的排气净化用合金催化剂，其平均粒径为30nm以下的第一催化剂金属粒子，以及 第二金属凝固相，其含有至少一种与催化金属颗粒不同的金属，并以至少45％的涂布比施加到第一催化金属颗粒，以及用于制备用于净化废气的合金催化剂的方法， 包括允许平均粒度高达30nm的第一催化金属颗粒粘附的步骤 并且还原沉淀含有与第一催化金属颗粒不同的至少一种金属的第二金属凝固相，并且包含选自Pt，Pd，Au，Rh，Ag和Ir中的至少一种金属 。