Abstract:
The invention discloses a method for producing acetaldehyde and/or acetic acid, according to which method a gaseous flow, containing molecular oxygen, ethanol and at least one impurity selected from sulphur compounds, is brought into contact at a high temperature with a sulphur-resistant oxidation catalyst. The ethanol is preferably obtained from a biomass. Said sulphur-resistant oxidation catalyst comprises, for example, vanadium oxide and at least one oxide of zirconium, titanium and aluminium. In one embodiment, the gaseous flow is converted, on the sulphur-resistant oxidation catalyst, into a first oxidation mixture, acetaldehyde being the predominant oxidation product, and said first oxidation mixture is converted, on another oxidation catalyst, into a second oxidation mixture, acetic acid being the predominant oxidation product. Said other oxidation catalyst comprises, for example, a multi-metal oxide containing at least molybdenum and vanadium.
Abstract:
La presente invención se refiere a un procedimiento para preparar 3-metil-2-butenol (prenol) y 3-metil-2-butenal (prenal) a partir de 3-metil-3-butenol (isoprenol), en el que el 3-metil-3-butenol es sometido a una isomerización catalítica por medio de un catalizador de Pd con soporte de carbono en presencia de una mezcla de gases que contiene 1% a 15% en volumen de oxígeno, con lo cual se obtiene una primera mezcla de productos, y esa primera mezcla de productos es sometida a una deshidrogenación oxidativa por medio de un catalizador de Pd que contiene SiO2 y/o Al2O3 como material de soporte, o por medio de un catalizador de Pd/Au con soporte de carbono en presencia de una mezcla de gases que contiene de 5% a 25% en volumen de oxígeno.
Abstract:
Processes for preparing a xylylenediamine by continuous hydrogenation, wherein the processes comprise: introducing a liquid circulation stream comprising a phthalonitrile and ammonia into a reactor to continuously hydrogenate the phthalonitrile in the presence of a heterogenous catalyst and the ammonia such that a reactor effluent comprising the xylylenediamine is formed; drawing off a portion of the reactor effluent to provide a first recycle stream; mixing at least a portion of the first recycle stream in a mixing unit with liquid ammonia and fresh phthalonitrile in solid or molten form to provide a second recycle stream; and recycling the second recycle stream to the liquid circulation stream, or wherein the second recycle stream and any remaining unmixed portion of the first recycle stream are both recycled to the liquid circulation stream.
Abstract:
A catalyst composition comprising-a support comprising TiO2,-a composite oxide containing vanadium and antimony, which has a rutile-type structure different from VSbO4 and V0.92Sb0.92O4 as determined by X-ray diffraction (XRD) analysis with CuKα radiation, and-optionally, one or more selected from the group consisting of oxides of silicon, oxides of vanadium and oxides of antimony, for selective catalytic reduction of nitrogen oxides; to a process for preparing the catalyst composition, to the catalyst composition obtained/obtainable by the process and to use of the same for selective catalytic reduction of nitrogen oxides.
Abstract:
Supported noble metal-comprising catalysts which can be obtained by a1) application of a noble metal compound, optionally in admixture with additives acting as promoters, to a support material, then drying, and a2) application of a reducing agent to a support material, then drying, wherein steps a1) and a2) are repeated simultaneously or in alternating turns, or wherein either of the compounds is applied entirely and then the other one is applied entirely, b) optionally afterwards drying of the resulting product, and c) subsequent calclnation, its use, especially for oxidative dehydrogenation and a process for producing it.
Abstract:
processo para a preparação de ácido acético. a invenção expõe um método para a produção de acetaldeído e/ou ácido acético, de acordo com cujo método, um fluxo gasoso, contendo oxigênio molecular, etanol e pelo menos uma impureza, selecionada a partir de compostos de enxofre, é colocado em contato, em alta temperatura, com um catalisador de oxidação resistente a enxofre. o etanol é, de um modo preferido, obtido a partir de uma biomassa. o referido catalisador de oxidação resistente a enxofre compreende, por exemplo, o óxido de vanádio e pelo menos um óxido de zircônio, titânio e alumínio. em uma modalidade, o fluxo gasoso é convertido, no catalisador de oxidação resistente a enxofre, a uma primeira mistura de oxidação, o acetaldeído sendo o produto de oxidação predominante, e a referida primeira mistura de oxidação sendo convertida em um outro calatalisador de oxidação, a uma segunda mistura de oxidação, ácido acético sendo o produto de oxidação predominante. o referido outro catalisador de oxidação compreende, por exemplo, um óxido multimetálico contendo, pelo menos, molibdênio e vanádio.
Abstract:
Los catalizadores que comprenden metal noble soportado que se pueden obtener mediante a1) aplicación de un compuesto de metal noble, opcionalmente en mezcla con aditivos actuando como promotores, a un material de apoyo, luego secar y a2) aplicación de un agente reductor a un material de apoyo, luego secar, donde los pasos a1) y a2) se repiten simultáneamente o en turnos alternados, o donde cualquiera de los compuestos se aplica totalmente y luego el otro se aplica en su totalidad, b) opcionalmente después del secado del producto resultante, y c) posterior calcinación, su uso, especialmente para la deshidrogenación oxidativa y un proceso para producirla.
Abstract:
Preparation of a catalyst molded body whose active mass is a multi-element oxide, comprises molding a finely-divided precursor mixture to a desired geometry by adding a graphite having a specific surface of 0.5-5 m 2>/g and an average particle diameter (d 5 0) of 40-200 mu m; and thermally treating the obtained catalyst precursor molded body at increased temperature. An independent claim is included for the catalyst molded body, obtained from the above process.
Abstract:
A catalyst composition comprising -a support comprising TiO 2, -a composite oxide containing vanadium and antimony, which has a rutile-type structure different from VSbO 4 and V 0.92Sb 0.92O 4 as determined by X-ray diffraction (XRD) analysis with Cu K a radiation, and -optionally, one or more selected from the group consisting of oxides of silicon, oxides of vanadium and oxides of antimony, for selective catalytic reduction of nitrogen oxides; to a process for preparing the catalyst composition, to the catalyst composition obtained/obtainable by the process and to use of the same for selective catalytic reduction of nitrogen oxides.
Abstract:
Electrodes comprise: (A) a solid medium through which gas can diffuse, (B) at least one electrically conductive, carbonaceous material, (C) at least one organic polymer, (D) at least one compound of the general formula (I) M1 aM2 bM3 cM4 dHeOf, in particulate form, where the variables are each defined as follows: M1 is selected from Mo, W, V, Nb and Sb, M2 is selected from Fe, Ag, Cu, Ni, Mn and lanthanoids, M3 is selected from B, C, N, Al, Si, P and Sn, M4 is selected from Li, Na, K, Rb, Cs, NH4, Mg, Ca and Sr, a is in the range from 1 to 3, b is in the range from 0.1 to 10, c is in the range from 0 to 1, d is in the range from 0 to 1, e is in the range from 0 to 0.5, f is in the range from 1 to 28, and wherein the compound of the general formula (I) has a BET surface area in the range from 1 to 300 m2/g.