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1.发明授权Three-way catalyst for treating emissions from compressed natural gas fueled engines 失效用于处理压缩天然气燃油发动机排放的三元催化剂
公开(公告)号：US5208204A
公开(公告)日：1993-05-04
申请号：US772318
申请日：1991-10-07
IPC分类号： B01D53/94 , B01J23/63 , B01J23/652 , B01J37/02
CPC分类号： B01D53/945 , B01J23/63 , B01J23/652 , B01J37/0205 , Y02T10/22
摘要： A three-way catalyst system for treating the exhaust stream of a compressed natural gas (CNG) fueled engine operating slightly rich of stoichiometry, the said catalyst system providing high conversions and low light-off temperature for the removal of HC, CO, and NO.sub.x. A high surface area gamma alumina support is impregnated with an intimate mixture of 0.2-30% Pd and 0.5-20% La.sub.2 O.sub.3, the Pd being in crystalline form with particle size in the range of 5-500 angstroms.A method of making such catalyst system comprising sequentially impregnating a high surface area gamma alumina support with lanthana and palladium by incipient wetness techniques, such techniques comprising the procedure of contacting alumina first with a lanthanum nitrate solution of desired concentration to obtain 0.5-20% lanthana, contacting the lanthana impregnated alumina with a palladium nitrate solution of desired concentration to obtain a 0.2-30% palladium content in the catalyst, each of said steps being separated by drying and calcination.A method of treating exhaust gas from a CNG fueled engine with the catalyst system described above, comprising: (a) operating said engine at slightly rich of stoichiometry; (b) exposing such catalyst to the exhaust gases in the range of 400.degree.-750.degree. C. and at a space velocity in the range of 0-100K hr.sup.-1, said exhaust gas being converted at an efficiency greater than 90% for each of NO, CO, and CH.sub.4.
摘要翻译： 一种用于处理压缩天然气（CNG）燃料发动机的排气流的三元催化剂系统，该发动机运行略微浓度化学计量，所述催化剂体系提供高转化率和低的熄灭温度以除去HC，CO和NOx 。 用0.2-30％Pd和0.5-20％La2O3的紧密混合物浸渍高表面积γ氧化铝载体，Pd为粒度在5-500埃范围内的结晶形式。 一种制备这种催化剂体系的方法，其包括通过初始润湿技术顺序地将高表面积γ氧化铝载体浸渍到镧和钯中，这种技术包括使氧化铝首先与所需浓度的硝酸镧溶液接触以获得0.5-20％的氧化镧 使所述浸渍了氧化镧的氧化铝与所需浓度的硝酸钯溶液接触以在催化剂中获得0.2-30％的钯含量，每个步骤通过干燥和煅烧分离。 一种利用上述催化剂系统处理来自CNG燃料发动机的废气的方法，包括：（a）以稍浓的化学计量运行所述发动机; （b）将这种催化剂暴露于400℃-750℃范围内的废气中，并且在0-100Khr -1的空间速度下，所述废气以大于90％的效率转化为 每个NO，CO和CH4。
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公开(公告)号：US5176887A
公开(公告)日：1993-01-05
申请号：US772317
申请日：1991-10-07
CPC分类号： B01D53/945 , B01J23/63 , Y02T10/22
摘要： A three-way catalyst system for treating the exhaust stream of a compressed natural gas (CNG) fueled engine operating slightly rich of stoichiometry, the said catalyst system providing high conversions and low light-off temperature for the remnoval of HC, CO, and NO.sub.x. A high surface area gamma alumina support is impregnated with an intimate mixture of 0.2-30% Pd and 0.5-20% La.sub.2 O.sub.3, the Pd being in crystalline form with a particle size in the range of 5.500 angstroms.A method of making such catalyst system comprising sequentially impregnating a high surface area gamma alumina support with lanthana and palladium by incipient wetness techniques, such techniques comprising the procedure of contacting alumina first with a lanthanum nitrate solution of desired concentration to obtain 0.5-20% lanthana, contacting the lanthana impregnated alumina with a palladium nitrate solution of desired concentration to obtain a 0.2-30% palladium content in the catalyst, each of said steps being separated by drying and calcination.A method of treating exhaust gas from a CNG fueled engine with the catalyst system described above, comprising: (a) operating said engine at slightly rich of stoichiometry; (b) exposing such catalyst to the exhaust gases in the range of 400.degree.-750.degree. C. and at a space velocity in the range of 0-100 K hr.sup.-1, said exhaust gas being converted at an efficiency greater than 90% for each of NO, CO, and CH.sub.4.
摘要翻译： 用于处理稍微浓度化学计量的压缩天然气（CNG）燃料发动机的排气流的三元催化剂系统，所述催化剂体系为HC，CO和NOx的残留提供高转化率和低的起燃温度 。 用0.2-30％Pd和0.5-20％La2O3的紧密混合物浸渍高表面积γ氧化铝载体，Pd为粒度在5-500埃范围内的结晶形式。 一种制备这种催化剂体系的方法，其包括通过初始润湿技术顺序地将高表面积γ氧化铝载体浸渍到镧和钯中，这种技术包括使氧化铝首先与所需浓度的硝酸镧溶液接触以获得0.5-20％的氧化镧 使所述浸渍了氧化镧的氧化铝与所需浓度的硝酸钯溶液接触以在催化剂中获得0.2-30％的钯含量，每个步骤通过干燥和煅烧分离。 一种利用上述催化剂系统处理来自CNG燃料发动机的废气的方法，包括：（a）以稍浓的化学计量运行所述发动机; （b）将这种催化剂暴露于400〜750℃范围内的废气中，并且在0-100Khr -1的空间速度下，所述废气的转化效率大于90％ 对于NO，CO和CH4中的每一个。
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公开(公告)号：US5196175A
公开(公告)日：1993-03-23
申请号：US803825
申请日：1991-12-09
CPC分类号： B01D53/945 , B01J23/40 , B01J37/0203 , Y02T10/22
摘要： A method of making a three-way catalyst based on platinum group metals, comprising: (a) impregnating an alumina substrate with a platinum group metal ion by contacting such substrate with an aqueous solution containing the platinum group metal in an amount of 0.1-5% by weight of alumina substrate and a water soluble acid that forms RCOOH with R being an alkyl or equivalent, said acid being present in an amount of 10-120% by weight of the alumina substrate, the pH of said solution being less than 4.0; and (b) drying and calcining the wetted substrate without sintering said substrate.The three-way catalyst construction based on platinum group metals has enhanced catalytic activity. It comprises an alumina substrate and a platinum group metal impregnation layer thereover, said impregnation layer being comprised of raft-like particle structures, each having increased metal density resulting from the nesting of both small and large metal particles within a given volume.
摘要翻译： 一种制备基于铂族金属的三元催化剂的方法，包括：（a）使铂基金属离子通过使含有铂族金属的水溶液与含有铂族金属的水溶液接触而使铂基金属离子浸渍， 氧化铝底物的重量百分数和形成RCOOH的水溶性酸，其中R为烷基或等同物，所述酸的存在量为氧化铝底物的10-120重量％，所述溶液的pH小于4.0 ; 和（b）在不烧结所述基底的情况下干燥和煅烧湿润的基底。 基于铂族金属的三元催化剂结构具有增强的催化活性。 其包括氧化铝基底和其上的铂族金属浸渍层，所述浸渍层由筏状颗粒结构组成，每个具有由给定体积内的小和大金属颗粒嵌套产生的金属密度增加。
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4.发明授权Dispersion enhanced PT group metal catalysts and method of making the catalysts 失效分散增强PT组金属催化剂和制备催化剂的方法
公开(公告)号：US5179060A
公开(公告)日：1993-01-12
申请号：US620514
申请日：1990-11-28
CPC分类号： B01D53/945 , B01J23/40 , B01J37/0203 , Y02T10/22 , Y10S502/506 , Y10S502/512
摘要： A method of making a three-way catalyst based on platinum group metals, comprisng: (a) impregnating an alumina substrate with a platinum group metal ion by contacting such substrate with an aqueous solution containing the platinum group metal in an amount of 0.1-5% by weight of alumina substrate and a water soluble acid that forms RCOOH with R being an alkyl or equivalent, said acid being present in an amount of 10-120% by weight of the alumina substrate, the pH of said solution being less than 4.0; and (b) drying and calcining the wetted substrate without sintering said substrate.The three-way catalyst construction based on platinum group metals has enhanced catalytic activity. It comprises an alumina substrate and a platinum group metal impregnation layer thereover, said impregnation layer being comprised of raft-like particle structures, each having increased metal density resulting from the nesting of both small and large metal particles within a given volume.
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公开(公告)号：US5139994A
公开(公告)日：1992-08-18
申请号：US621134
申请日：1990-11-28
CPC分类号： B01D53/944 , B01J23/42 , B01J37/0205 , B01J37/086
摘要： A method of making an oxidation catalyst for use in automotive exhaust gas treatment by impregnating with platinum a mechanical carrier having a support comprised substantially of alumina to produce a composite having, by weight, 1-5% platinum, and impregnating (by incipient wetness) the composite with an organo-titanium compound (titanium butoxide) and decomposing such compound to form a discontinuous titanium oxide phase on or adjacent the exposed portions of the composite.A method of treating automotive exhaust gases carrying hydrocarbons is also disclosed, comprising initiating combustion in an internal combustion engine fueled with fossil fuel, placing an oxidation catalyst at a location in close proximity to the source of such emissions, and exposing at such location the exhaust gases to a catalyst consisting of an Al.sub.2 O.sub.3 substrate, a continuous coating of platinum in an amount of 0.1-5% by weight, and a complexing discontinuous phase of titania thereover in an amount of 0.1-2.5%.
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公开(公告)号：US5866498A
公开(公告)日：1999-02-02
申请号：US952060
申请日：1992-09-28
CPC分类号： B01D53/945 , B01J23/30 , B01J23/6527 , Y02T10/22
摘要： The present invention broadly relates to a catalyst for promoting the oxidation-reduction reactions of the exhaust gases produced by an internal combustion engine wherein the catalyst comprises; tungsten oxide, a basic metal oxide, and a noble metal. More narrowly, the present invention relates to a catalyst for promoting oxidation-reduction reactions with the exhaust gases produced by internal combustion engine wherein the catalyst comprises; a composite oxide comprised of a refractory oxide, tungsten oxide in juxtaposed relation with the refractory oxide, and a basic metal oxide in juxtaposed relation with the tungsten oxide; and arrayed on the composite oxide a noble metal.
摘要翻译： 本发明广泛地涉及用于促进由内燃机生产的废气的氧化还原反应的催化剂，其中催化剂包括： 氧化钨，碱性金属氧化物和贵金属。 更狭义地说，本发明涉及一种用于促进与内燃机产生的废气的氧化还原反应的催化剂，其中催化剂包括： 由耐火氧化物，与耐火氧化物并置的氧化钨和与氧化钨并列的碱性金属氧化物构成的复合氧化物; 并在复合氧化物上排列贵金属。
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公开(公告)号：US5234881A
公开(公告)日：1993-08-10
申请号：US894703
申请日：1992-06-05
CPC分类号： B01J23/63 , B01J37/024
摘要： A catalyst having high temperature (800.degree.-1050.degree. C.) stability and improved three-way automotive exhaust gas catalyst activity at high temperatures, comprising an outer catalytic coating of binary La-Pd oxide (La.sub.2 Pd.sub.2 O.sub.5 or La.sub.4 PdO.sub.7) calcined and supported on a catalyst-supporting substrate, the oxide being present in an amount to provide 15-150 g of Pd per cubic foot of the substrateA method of making binary La-Pd oxides useful as an automotive exhaust catalyst operative at high temperatures, comprising heating in an oxidizing atmosphere a mixture containing La compounds and Pd compounds in a La:Pd ratio of 1:1 or 4:1, the heating being staged to first heat slowly from about 50.degree. C. to start decomposition of the compounds and thereafter retaining the residue at an elevated temperature to stimulate growth of crystalline binary La-Pd oxides and to calcine the crystalline oxides.A method of making an automotive catalyst by suspending binary La-Pd oxides in a sol (preferably alumina sol) and depositing and fixing such sol suspension on a substrate coated with conventional washcoats.
摘要翻译： 在高温下具有高温（800-105℃）稳定性和改进的三元汽车尾气催化剂活性的催化剂，其包含在二氧化碳上煅烧和负载的二元La-Pd氧化物（La2Pd2O5或La4PdO7）的外部催化涂层 催化剂负载底物，氧化物的存在量为每立方英尺底物提供15-150g Pd。制备用作在高温下操作的汽车尾气催化剂的二元La-Pd氧化物的方法，包括在 氧化气氛中含有La化合物和Pd化合物的La：Pd比为1:1或4:1的混合物，分级加热，首先从约50℃缓慢加热，开始分解化合物，然后保留残余物 在升高的温度下刺激结晶二元La-Pd氧化物的生长并煅烧结晶氧化物。 通过将二元La-Pd氧化物悬浮在溶胶（优选氧化铝溶胶）中并将这种溶胶悬浮液沉积并固定在涂有常规洗面涂层的基材上来制备汽车催化剂的方法。
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公开(公告)号：US5376344A
公开(公告)日：1994-12-27
申请号：US649409
申请日：1991-01-28
IPC分类号： F01N3/28 , B01D53/94 , B01J23/44 , B01J23/56 , B01J23/63 , B01J23/89 , B01J35/04 , B01J37/02 , B01J21/06 , B01D53/46
CPC分类号： B01D53/945 , B01J23/44 , B01J37/024 , Y02T10/22
摘要： A three-way catalyst for automotive emission control having a mechanical carrier having a support comprised substantially of alumina, a catalytic compound supported on said carrier having a major constituent of palladium, and a discontinuous phase of titanium oxide on or adjacent substantially each exposed particle of the catalytic compound. A method of making a three-way catalyst for automotive emission control, comprising: impregnating with palladium a mechanical carrier having a support comprised substantially of alumina to produce a composite having 0.05-5.0% palladium; and impregnating the composite with an organo-titanium compound and decomposing such impregnated compound to form a discontinuous titanium oxide phase on or adjacent the exposed portions of said composite.
摘要翻译： 一种用于汽车排放控制的三元催化剂，其具有机械载体，其具有基本上由氧化铝组成的载体，负载在所述载体上的催化化合物具有钯的主要成分，以及基本上每个暴露的 催化剂。 一种制备用于汽车排放控制的三元催化剂的方法，包括：用钯浸渍具有基本上由氧化铝组成的载体的机械载体，以制备具有0.05-5.0％钯的复合物; 并用有机钛化合物浸渍复合物并分解这种浸渍的化合物以在所述复合材料的暴露部分上或其附近形成不连续的氧化钛相。
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公开(公告)号：US5086026A
公开(公告)日：1992-02-04
申请号：US461947
申请日：1990-01-08
CPC分类号： B01J37/0219 , B01J23/464 , B01D2255/1025 , B01D53/9413
摘要： Method of enhancing the catalytic effectiveness of rhodium to reduce nitric oxides: (a) preparing a polymer modifier (molecular weight of 500-50,000) by controllably reacting amine [mono-2-hydroxyl ethyl amine and di-2-hydroxy ethyl amine] with epoxy resin (two or more epoxide groups per molecule) to form a soluble adduct and adding to the adduct a solvent to form a homogeneous amino polymer solution; (b) coating a granular support material (gamma alumina) with rhodium chloride and/or rhodium nitrate compounds; and (c) mixing the coated support material with added amino polymer solution to the support material either prior to or subsequent to step (b) and heating the mixture of polymer solution, support material, and rhodium chloride and/or rhodium nitrate compounds to evaporate the solvent and to decompose and eliminate the polymer, leaving the coated support material with rhodium in a morphologically changed condition devoid of amino polymer but having enhanced catalytic effectiveness for promoting reduction of nitric oxide.
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10.发明授权Three-way catalyst for automotive emission control and method of making the catalyst 失效用于汽车排放控制的三元催化剂和催化剂的制备方法
公开(公告)号：US5021389A
公开(公告)日：1991-06-04
申请号：US440578
申请日：1989-11-22
CPC分类号： B01D53/945 , B01J23/63 , B01J37/024 , Y02T10/22
摘要： A three-way catalyst for automotive emission control having a mechanical carrier having a support comprised substantially of alumina, a lanthanum oxide coating decorated onto the support, a catalytic compound discontinuously supported on the decorated support having a major constituent of palladium, and a discontinuous phase of titanium oxide on the alumina, lanthana, and catalytic compound composite.The method of making such three-way catalyst for automotive emission control, comprises coating an alumina support with lanthana, impregnating the coated support with a palladium compound to form a discontinuous phase on the lanthana, and impregnating the coated support and catalytic compound with an organo-titania compound to form a discontinuous phase on the lanthana and palladium compound.
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