Process for reducing emissions of oxides of nitrogen in a medium which is super-stoichiometric in oxidizing agents
    2.
    发明授权
    Process for reducing emissions of oxides of nitrogen in a medium which is super-stoichiometric in oxidizing agents 失效
    在氧化剂中超化学计量的介质中减少氮氧化物排放的方法

    公开(公告)号:US06217838B1

    公开(公告)日:2001-04-17

    申请号:US09415236

    申请日:1999-10-12

    IPC分类号: B01J800

    摘要: The invention concerns a process for reducing emissions of oxides of nitrogen in a medium which is super-stoichiomeitric in oxidising agents, comprising: a) a step for oxidising at least a portion of the oxides of nitrogen in the presence of an oxidation material; b) a step for injecting organic compounds which comprise at least one atom selected from carbon, hydrogen, oxygen and nitrogen; c) a step for adsorbing at least a portion of the organic compounds onto an adsorption material in the form of molecular species and/or carbonaceous residues; d) a step for selective reduction of at least a portion of the oxides of nitrogen to molecular nitrogen by at least a portion of the molecular species and/or carbonaceous residues formed on the adsorption material.

    摘要翻译: 本发明涉及一种减少氧化剂中超化学计量的介质中氮氧化物排放的方法,包括:a)在氧化物质存在下氧化至少一部分氮氧化物的步骤; b )用于注入包含至少一个选自碳,氢,氧和氮的原子的有机化合物的步骤; c)将至少一部分有机化合物以分子种类和/或形式吸附到吸附材料上的步骤 碳质残渣; d)通过在吸附材料上形成的分子种类和/或碳质残渣的至少一部分,将至少一部分氮氧化物选择还原成分子氮的步骤。

    Production process for catalysts on supports including a centrifuging
step for the support after coating
    4.
    发明授权
    Production process for catalysts on supports including a centrifuging step for the support after coating 失效
    催化剂在载体上的制备方法,包括涂布后的载体的离心步骤

    公开(公告)号:US5723403A

    公开(公告)日:1998-03-03

    申请号:US282468

    申请日:1994-07-29

    摘要: A production process for supported catalysts is described comprising: (a) preparing a coating suspension containing at least one refractory inorganic oxide and at least some of the elements intended to constitute catalytically active phase (A); (b) filling at least part of the open porosity of a support with this suspension; (c) drying the filled support by centrifuging; (d) a thermal treatment of the support to obtain a support coated by a wash coat; (e) optionally impregnating the coated support with a solution containing the rest of, or elements of, catalytically active phase (A); and (f) thermally activating the catalyst. This preparation process is of particular interest in the production of catalysts for treating exhaust gases of internal combustion engines, where the wash coat deposited on a support comprises in particular a refractory inorganic oxide, iron oxide and cerium oxide and, by way of a catalytically active element, at least one noble metal such as platinum, rhodium or palladium.

    摘要翻译: 描述了负载催化剂的制备方法,其包括:(a)制备包含至少一种耐火无机氧化物和至少一些旨在构成催化活性相(A)的元素的涂料悬浮液; (b)用该悬浮液填充载体的至少部分开放孔隙; (c)通过离心干燥填充的支架; (d)对所述载体进行热处理以获得由洗衣层涂覆的载体; (e)任选地用包含催化活性相(A)的其余部分或元素的溶液浸渍涂覆的载体; 和(f)热活化催化剂。 这种制备方法在生产用于处理内燃机废气的催化剂中特别有意义,其中沉积在载体上的洗涤涂层特别包括耐火无机氧化物,氧化铁和氧化铈,并且通过催化活性 元素,至少一种贵金属如铂,铑或钯。

    Process for catalytic combustion of a fuel in the presence of a
non-selective oxidation catalyst
    5.
    发明授权
    Process for catalytic combustion of a fuel in the presence of a non-selective oxidation catalyst 失效
    在非选择性氧化催化剂存在下催化燃烧燃料的方法

    公开(公告)号:US5915951A

    公开(公告)日:1999-06-29

    申请号:US770771

    申请日:1996-12-20

    IPC分类号: B01D53/94 B01J23/89

    CPC分类号: B01J23/894 B01D53/944

    摘要: Processes for the catalytic combustion of hydrocarbons, carbon monoxide, hydrogen, or mixtures thereof (processes with one or more catalytic stages) and processes of abating the pollution produced by the exhaust gases of vehicles that run on natural gas using a non-selective oxidation catalyst. The non-selective oxidation catalyst comprises a monolithic substrate, a porous support with a refractory inorganic oxide base and an active phase that consists of cerium, zirconium, iron, and at least one metal that is selected from the group that is formed by palladium and platinum is described; with the porous support content being between 200 and 400 g per liter of catalyst; with the cerium content being between 0.3 and 20% by weight relative to the porous support; with the zirconium content being between 0.3 and 20% by weight relative to the porous support; with the iron content being between 0.01 and 3.5% of iron by weight relative to the porous support; and with the palladium and/or platinum content being higher than 3 g per liter of catalyst.

    摘要翻译: 用于烃,一氧化碳,氢气或其混合物(具有一个或多个催化级的方法)的催化燃烧的方法以及减轻使用非选择性氧化催化剂在天然气上运行的车辆废气产生的污染的方法 。 非选择性氧化催化剂包括整体式底物,具有耐火无机氧化物碱的多孔载体和由铈,锆,铁和至少一种金属组成的活性相,所述金属选自钯和 铂描述; 多孔载体含量在每升催化剂200至400g之间; 铈含量相对于多孔载体为0.3至20重量%; 锆含量相对于多孔载体为0.3至20重量%; 铁含量相对于多孔载体为铁的重量的0.01%至3.5%; 并且钯和/或铂含量高于3g / l催化剂。

    Catalyst comprising an assembly of at least one wire and its use in
combustion or in post-combustion
    6.
    发明授权
    Catalyst comprising an assembly of at least one wire and its use in combustion or in post-combustion 失效
    催化剂包括至少一根电线的组件及其在燃烧或后燃烧中的用途

    公开(公告)号:US5565401A

    公开(公告)日:1996-10-15

    申请号:US274522

    申请日:1994-07-31

    摘要: The invention relates to a catalyst comprising an assembly of at least one wire that comprises, in % weight, between 60 and 90% iron, and between 10 and 25% chromium, at least one metal selected from the group formed by platinum, rhodium, palladium, ruthenium, iridium, gold and silver having been deposited on the assembly, the outside contour of the cross-section of the wire being included in a ring whose area is between a circle with a 90 .mu.m diameter and a circle with a 5 mm diameter, the length of the wire being at least equal to 20 cm, and the assembly being mechanically integral, the wire having been subjected to a prior depositing of aluminum, in a proportion going up to 10% by weight in relation to the weight of the wire, followed by a redrawing.A preferred assembly corresponds to a knitted structure (1) in the shape of a sock.

    摘要翻译: 本发明涉及一种催化剂,其包含至少一根导线的组件,该组合物以重量%计含有60%至90%的铁,以及10%至25%的铬,至少一种选自铂,铑, 已经沉积在组件上的钯,钌,铱,金和银,线的横截面的外部轮廓包括在面积为90μm直径的圆和具有5的圆之间的环中 mm直径,电线的长度至少等于20厘米,而组件是机械一体的,电线已经经历了铝的预先沉积,其比例相对于重量高达10重量% 的电线,然后重画。 优选的组件对应于袜子形状的针织结构(1)。

    Method for preparing multi-metal catalysts
    7.
    发明授权
    Method for preparing multi-metal catalysts 失效
    制备多金属催化剂的方法

    公开(公告)号:US5413984A

    公开(公告)日:1995-05-09

    申请号:US934515

    申请日:1992-10-13

    摘要: A method for preparing multi-metal catalysts including an active phase consisting of at least two metals, A and B, which are selected from groups VIII and IB of the periodic table, and a porous support. According to the method: firstly, at least a part of the porous support is impregnated with at least one precursor of metal A; secondly, activation is performed in a neutral or oxidizing atmosphere at a temperature of 120.degree.-800.degree. C. whereafter a treatment is carried out in a reduction medium at a temperature of 0.degree.-800.degree. C.; thirdly, at least a part of the support which was previously impregnated with the precursor of metal A is impregnated with at least one precursor of metal B; and fourthly, activation is performed in a neutral or oxidizing atmosphere at a temperature of 120.degree.-800.degree. C. The catalysts thereby obtained have improved stability, particularly when subjected to high temperatures, such as when they are used as post-combustion catalysts for exhaust gases from internal combustion engines, in which case metal A is platinum or palladium and metal B is platinum, palladium or rhodium, with the proviso that B is not the same as A.

    摘要翻译: PCT No.PCT / FR91 / 00969 Sec。 371日期:1992年10月13日 102(e)日期1992年10月13日PCT 1991年12月4日PCT PCT。 出版物WO92 / 11086 日期:1992年7月9日。一种制备多金属催化剂的方法,包括由至少两种选自元素周期表Ⅷ和IB的金属A和B组成的活性相和多孔载体。 根据该方法:首先,至少一部分多孔载体用至少一种金属A的前体浸渍; 其次,在中性或氧化性气氛中在120-800℃的温度下进行活化,然后在还原介质中在0-800℃的温度下进行处理。 第三,先前用金属A的前体浸渍的载体的至少一部分用至少一种金属B的前体浸渍; 第四,在中性或氧化性气氛中,在120-800℃的温度下进行活化。由此获得的催化剂具有改善的稳定性,特别是当经受高温时,例如当它们用作后燃催化剂 来自内燃机的废气,在这种情况下,金属A为铂或钯,金属B为铂,钯或铑,条件是B与A不同。

    Platinum-based, bimetallic catalyst, and a second group VIII metal used for the opening of cyclic compounds
    8.
    发明授权
    Platinum-based, bimetallic catalyst, and a second group VIII metal used for the opening of cyclic compounds 失效
    铂金双金属催化剂和用于开环的化合物的第二族Ⅷ族金属

    公开(公告)号:US07700514B2

    公开(公告)日:2010-04-20

    申请号:US11979637

    申请日:2007-11-06

    摘要: A catalyst comprising at least one porous support, at least some platinum, and at least a second group VIII metal which is different from platinum and iridium, said catalyst having been prepared in accordance with a process comprising a) impregnation of the support with at least one solution containing a platinum precursor, b) activation in a neutral or oxidizing atmosphere, at a temperature of between 120 and 800° C., c) activation in a reducing medium, at a temperature of between 0 and 800° C., d1) impregnation with an aqueous solution and d2) treatment with at least one hydrogen donor compound, at a temperature of less than 200° C., e) the impregnation of the support, which has already been impregnated with the platinum, with at least one solution containing a precursor of said second group VIII metal, and f) activation in a neutral, reducing, or oxidizing atmosphere, at a temperature of between 100 and 800° C.

    摘要翻译: 一种催化剂,其包含至少一种多孔载体,至少一些铂和至少一种不同于铂和铱的第Ⅷ族金属,所述催化剂是根据以下方法制备的,所述方法包括:a)至少浸渍载体 一种含有铂前体的溶液,b)在中性或氧化性气氛中在120-800℃的温度下活化,c)在还原介质中,在0和800℃之间的温度下,d1 )用水溶液浸渍,和d2)在低于200℃的温度下用至少一种氢供体化合物进行处理,e)将已经用铂浸渍的载体浸渍至少一个 含有所述第二族VIII族金属的前体的溶液,和f)在中性,还原性或氧化性气氛中在100〜800℃的温度下进行活化。

    Process for adsorbing and desording oxides of nitrogen
    9.
    发明授权
    Process for adsorbing and desording oxides of nitrogen 失效
    吸附和去除氮氧化物的方法

    公开(公告)号:US06471923B1

    公开(公告)日:2002-10-29

    申请号:US09631990

    申请日:2000-08-03

    IPC分类号: C01G3000

    摘要: The invention concerns materials for adsorbing and desorbing oxides of nitrogen NO and NO2 present in exhaust gases, in particular from the internal combustion engines of automotive vehicles operating in a medium which is super-stoichiometric in oxidizing agents, which can desorb the oxides of nitrogen by elevating the temperature, with respect to an adsorption temperature, the structure of the materials being composed of phosphate tetrahedra and containing at least one element (A) from groups IVB, VB, VIB, VIIB, IVA, optionally at least one element (B) selected from the group formed by alkali elements IA, alkaline-earth elements IIA, rare earths IIIB and transition metals, and optionally at least one metal (C) selected from the group formed by the precious metals of the platinum family (group VIII). These materials are insensitive to the oxides of sulphur and carbon contained in the gas.

    摘要翻译: 本发明涉及用于吸附和解吸废气中NO,NO2的氧化物的材料,特别是在氧化剂中超化学计量的介质中运行的机动车辆的内燃机,其可以通过以下方式解吸氮氧化物: 提高相对于吸附温度的温度,材料的结构由磷酸四面体组成并且包含至少一种元素(A),IVB,VB,VIB,VIIB,IVA族,任选的至少一种元素(B) 选自由碱元素IA,碱土元素IIA,稀土IIIB和过渡金属形成的基团,以及任选的至少一种选自铂族(VIII族)的贵金属形成的金属(C)。 这些材料对气体中所含的硫和碳的氧化物不敏感。

    Combustion catalyst and combustion process using such a catalyst
    10.
    发明授权
    Combustion catalyst and combustion process using such a catalyst 失效
    燃烧催化剂和使用这种催化剂的燃烧过程

    公开(公告)号:US06284210B1

    公开(公告)日:2001-09-04

    申请号:US08857072

    申请日:1997-05-15

    IPC分类号: B01J802

    CPC分类号: F23C13/00 B01J23/894

    摘要: A combustion catalyst comprising a monolithic substrate, a porous support based on refractory inorganic oxide and an active phase formed by cerium, iron and at least one metal selected from the group formed by palladium and platinum, the content of porous support being between 100 and 400 g per liter of catalyst; the content of cerium being between 0.3 and 20% by weight with respect to the porous support; the content of iron being between 0.01 and 3.5% of iron by weight with respect to the porous support; and the content of palladium and/or platinum being between 3 and 20 g per liter of catalyst. The catalyst of the invention is used in particular in processes for the catalytic combustion of hydrocarbons, carbon monoxide, hydrogen or mixtures thereof, in processes involving one or more catalytic stages.

    摘要翻译: 一种燃烧催化剂,其包含整体式基体,基于耐火无机氧化物的多孔载体和由铈,铁和选自钯和铂形成的基团中的至少一种金属形成的活性相,多孔载体的含量为100-400 g每升催化剂; 相对于多孔载体,铈的含量为0.3〜20重量% 铁的含量相对于多孔载体为铁的重量的0.01%至3.5%; 钯和/或铂的含量为3至20克/升催化剂。本发明的催化剂特别用于烃,一氧化碳,氢气或其混合物的催化燃烧方法中,涉及一种 或更多的催化阶段。