GAS DIFFUSION ELECTRODE AND CATALYST FOR ELECTROCHEMICAL OXYGEN REDUCTION AND METHOD OF DISPERSING THE CATALYST
    46.
    发明申请
    GAS DIFFUSION ELECTRODE AND CATALYST FOR ELECTROCHEMICAL OXYGEN REDUCTION AND METHOD OF DISPERSING THE CATALYST 有权
    用于电化学氧化还原的气体扩散电极和催化剂以及分散催化剂的方法

    公开(公告)号:US20050201918A1

    公开(公告)日:2005-09-15

    申请号:US10708565

    申请日:2004-03-11

    摘要: An improved gas diffusion electrode composed of a perovskite-type oxide dispersed in a mixture of carbon black and a hydrophobic binder polymer. An improved catalyst for use in the electrochemical reduction of oxygen comprising a perovskite-type compound having alpha and beta sites, and having a greater molar ratio of cations at the beta site. A particularly good reduction catalyst is a neodymium calcium manganite. An improved method of dispersing the catalysts with carbon in a reaction layer of the electrode improves performance of the electrode and the oxygen reduction process. This is provided by adding carbon black to an aqueous solution of metal salts before it is heated to a gel and then to a char and then calcined. Optionally, a quantity of the desired oxide catalyst can be premixed with a portion the carbon before adding the carbon to an aqueous solution of the metal salts to be heated. The amount of premixed metal oxide is chosen in conjunction with the amount of metal salts to provide the desired molar ratio after heating and calcining of the aqueous solution.

    摘要翻译: 改进的气体扩散电极,其由分散在炭黑和疏水性粘合剂聚合物的混合物中的钙钛矿型氧化物组成。 用于电化学还原氧的改进的催化剂包括具有α和β位点的钙钛矿型化合物,并且在β位具有更大的阳离子摩尔比。 特别好的还原催化剂是钕钙锰矿。 将电催化剂用碳分散在电极的反应层中的改进方法提高了电极的性能和氧还原过程。 这是通过在金属盐的水溶液加热至凝胶然后加入炭然后煅烧之前将炭黑加入到水溶液中而提供的。 任选地,一定量的所需氧化物催化剂可以在将碳添加到待加热的金属盐的水溶液中之前与碳的一部分预混合。 联合金属盐的量选择预混合金属氧化物的量,以便在加热和煅烧水溶液之后提供所需的摩尔比。

    Perovskite-type metal oxide compounds
    49.
    发明授权
    Perovskite-type metal oxide compounds 失效
    钙钛矿型金属氧化物

    公开(公告)号:US5977017A

    公开(公告)日:1999-11-02

    申请号:US797578

    申请日:1997-02-07

    申请人: Stephen J. Golden

    发明人: Stephen J. Golden

    摘要: A perovskite-type catalyst consists essentially of a metal oxide composition. The metal oxide composition is represented by the general formula A.sub.1-x B.sub.x MO.sub.3, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0.ltoreq.x

    摘要翻译: 钙钛矿型催化剂基本上由金属氧化物组合物组成。 金属氧化物组合物由通式A1-xBxMO3表示,其中A是原始以从bastnasite收集的单相混合镧系元素形式的元素的混合物; B是二价或一价阳离子; M为选自23至30,40至51和73至80的原子序数的元素中的至少一种元素; a是1或2; 当a为1时,b为3,当a为2时,b为4; 并且x是由0

    Catalyst for purifying automobile exhausts and method of manufacturing
the catalyst
    50.
    发明授权
    Catalyst for purifying automobile exhausts and method of manufacturing the catalyst 失效
    用于净化汽车排气的催化剂及其制造方法

    公开(公告)号:US5906958A

    公开(公告)日:1999-05-25

    申请号:US731241

    申请日:1996-10-11

    摘要: A catalyst for purifying exhaust gases of an automobile engine including a carrier coprecipitated with a material absorbing oxides of nitrogen (NO.sub.x) and an active noble metal wherein the material absorbing oxides of nitrogen is at least one of barium manganese oxide (BaMnO.sub.3) and calcium manganese oxide (CaMnO.sub.3). The carrier coprecipitated with BaMnO.sub.3 or CaMnO.sub.3 shows superior capacity for absorbing oxides of nitrogen. Consequently, a catalyst according to the present invention can effectively purify engine exhaust, even in a lean burn environment.

    摘要翻译: 一种用于净化汽车发动机废气的催化剂,其包括与吸收氮氧化物(NOx)和活性贵金属的材料共沉淀的载体,其中吸收氮的氧化物的材料是钡锰氧化物(BaMnO 3)和钙锰 氧化物(CaMnO3)。 与BaMnO3或CaMnO3共沉淀的载体显示出优异的吸收氮氧化物的能力。 因此,根据本发明的催化剂即使在贫燃环境中也能有效地净化发动机排气。