摘要:
An oxidative coupling of methane (OCM) catalyst composition comprising one or more oxides doped with Ag; wherein one or more oxides comprises a single metal oxide, mixtures of single metal oxides, a mixed metal oxide, mixtures of mixed metal oxides, or combinations thereof; and wherein one or more oxides is not La2O3 alone. A method of making an OCM catalyst composition comprising calcining one or more oxides and/or oxide precursors to form one or more calcined oxides, wherein the one or more oxides comprises a single metal oxide, mixtures of single metal oxides, a mixed metal oxide, mixtures of mixed metal oxides, or combinations thereof, wherein the one or more oxides is not La2O3 alone, and wherein the oxide precursors comprise oxides, nitrates, carbonates, hydroxides, or combinations thereof; doping the one or more calcined oxides with Ag to form the OCM catalyst composition; and thermally treating the OCM catalyst composition.
摘要:
The present disclosure generally relates to a silver-based epoxidation catalyst. In certain embodiments, a method is provided for modulating the reactivity of the silver-based epoxidation catalyst, comprising the catalyst being post-treated with at least two different salt solutions. In some embodiments, the treatment results in the deposition of one or more metals onto the surface of the catalyst. In further embodiments, method is also provided of using the silver catalyst to generate an epoxide from an olefin.
摘要:
An oxidative coupling of methane (OCM) catalyst composition comprising one or more oxides doped with Ag; wherein one or more oxides comprises a single metal oxide, mixtures of single metal oxides, a mixed metal oxide, mixtures of mixed metal oxides, or combinations thereof; and wherein one or more oxides is not La2O3 alone. A method of making an OCM catalyst composition comprising calcining one or more oxides and/or oxide precursors to form one or more calcined oxides, wherein the one or more oxides comprises a single metal oxide, mixtures of single metal oxides, a mixed metal oxide, mixtures of mixed metal oxides, or combinations thereof, wherein the one or more oxides is not La2O3 alone, and wherein the oxide precursors comprise oxides, nitrates, carbonates, hydroxides, or combinations thereof; doping the one or more calcined oxides with Ag to form the OCM catalyst composition; and thermally treating the OCM catalyst composition.
摘要翻译:包含一种或多种掺杂有Ag的氧化物的甲烷(OCM)催化剂组合物的氧化偶联; 其中一种或多种氧化物包含单一金属氧化物,单一金属氧化物的混合物,混合金属氧化物,混合金属氧化物的混合物或其组合; 并且其中一种或多种氧化物不是单独的La 2 O 3。 一种制造OCM催化剂组合物的方法,包括煅烧一种或多种氧化物和/或氧化物前体以形成一种或多种煅烧氧化物,其中所述一种或多种氧化物包括单一金属氧化物,单一金属氧化物的混合物,混合金属氧化物, 混合金属氧化物的混合物或其组合,其中所述一种或多种氧化物单独不是La 2 O 3,并且其中所述氧化物前体包含氧化物,硝酸盐,碳酸盐,氢氧化物或其组合; 用Ag掺杂一种或多种煅烧氧化物以形成OCM催化剂组合物; 并热处理OCM催化剂组合物。 p>
摘要:
The present invention relates to a catalyst for the epoxidation of alkenes, comprising silver, rhe nium, cesium, lithium, tungsten and sulfur on a support. The present invention further relates to a process for producing the catalyst and the use of the catalyst for the oxidation of alkylenes to alkylene oxides. In addition, the present invention relates to a process for preparing ethylene oxide from ethylene, which comprises the oxidation of ethylene with oxygen in the presence of said catalyst.
摘要:
A presente invenção objetiva viabilizar um catalisador e processo de obtenção do mesmo que, além de possuir uma maior resistência a deposição de coque na superfície do catalisador, não introduza limitações às variáveis do processo, mantenha patamares aceitáveis de atividade durante todo o processo de reforma a vapor e que tenha um menor custo de produção. O referido objetivo é atingido por intermédio de um catalisador formado por um suporte de óxido inorgânico, uma mistura de Níquel, Lantânio e Cério e um elemento promotor.
摘要:
A method for producing epoxidation catalysts is provided. The catalyst comprises a support, a catalytic species, maganese and at least one alkali metal and/or promoter. The catalytic species may be silver. The catalyst is prepared by a method wherein at least a portion of the manganese is impregnated in a step separate from the at least one alkali metal and/or promoter. Advantageously, catalysts produced by the present method may exhibit greater efficiencies than catalysts produced by conventional methods. A method for the epoxidation of alkylenes using the catalysts so produced is provided as is a method for using the alkylene oxides for the production of 1,2-diols, 1,2-carbonates, 1,2-diol ethers, or alka-nolamines.
摘要:
A particulate filter (1) is described comprising a filtering body (5) formed by a porous substrate and provided with a plurality of gas channels (6', 6") defined by gas- permeable walls (7) of said substrate, said gas-permeable walls (7) being coated with a catalytic composition comprising: a) a metallic phase having the formula: Ag1-xPdx, wherein x is a number comprised between 0 and 0.2; and b) a cerium oxide doped with at least one rare earth group metal having the formula: Ce1-yRyO2-Y/2, wherein R is a rare earth group metal selected from Gd, Sm, Eu, La, and mixtures thereof and y is a' number comprised between 0.1 and 0.5. Catalytically active compositions useful for regenerating a filter (1) of this type, the use of these compositions as a catalytic active coating of a filtering element of an exhaust gas emitted by an internal combustion engine (4), as well as processes for preparing the filter (1) and compositions are also described.
摘要翻译:一种微粒过滤器(1)被描述为包括由多孔基底形成的过滤体(5),并且设置有由所述基底的气体可渗透壁(7)限定的多个气体通道(6',6“),所述气体 - 渗透壁(7)涂覆有催化组合物,其包括:a)具有下式的Ag1-xPdx的金属相,其中x是0和0.2之间的数字;和b)掺杂有至少一种稀有金属的氧化铈 具有式Ce 1-y R y O 2 -Y / 2的地球族金属,其中R是选自Gd,Sm,Eu,La的稀土族金属及其混合物,y是'数在0.1和0.5之间。催化活性 用于再生这种过滤器(1)的组合物,使用这些组合物作为由内燃机(4)发射的废气的过滤元件的催化活性涂层,以及制备过滤器的方法( 1)和组合物也被描述。
摘要:
Catalysts, systems and methods for abating emissions in an exhaust stream are provided. Systems comprising a transition metal oxide stabilized oxygen storage catalyst are described. The emissions treatment system is advantageously used for the treatment of exhaust streams from lean burn engines including diesel engines and lean burn gasoline engines.
摘要:
A one-step vapor phase oxidation process produces an unsaturated carboxylic acid, such as acrylic acid or methacrylic acid, from an alkane, such as propane or isobutane, with a mixed metal oxide catalyst and an excess of alkane relative to oxygen. The unreacted alkane and the byproduct alkene are recycled to the reaction zone without separation. Overall yield and productivity of the unsaturated carboxylic improves for such a process. An analogous method for the preparation of unsaturated nitrites is also disclosed.