Abstract:
The present invention relates to a ferrous zeolite, wherein the number of iron centers, relative to the zeolite, is greater than the number of cation positions of the zeolite. The present invention further relates to a ferrous zeolite that can be produced by gas phase reaction with iron pentacarbonyl, comprising a greater specific surface area than analogous ferrous zeolites produced by ion exchange and/or more hydrothermally stable than analogous ferrous zeolites produced by ion exchange. The present invention further relates to a ferrous zeolite of BETA structure that can be produced by gas phase reaction with iron pentacarbonyl, wherein the number of iron clusters greater than 10 nm is less than 15 wt%, relative to the total amount of iron. The present invention further relates to a method for producing ferrous zeolithic material, characterized in that doping with iron takes place by means of a gas phase reaction using iron pentacarbonyl. The present invention further relates to a method for catalytically reducing nitrogen oxides by adding ammoniac and using catalysts comprising said ferrous zeolithic material.
Abstract:
The present invention relates to an electrically heatable packed pressure-bearing device for performing endothermic reactions having an upper (3), middle (1) and lower (3) device section, wherein at least one vertically disposed electrode pair (4, 5) is fitted in the middle section (1) and all electrodes are arranged in an electrically conducting solid packing (26), the upper and lower device sections have a specific conductivity of 10
Abstract:
The invention relates to a process for the parallel preparation of hydrogen, carbon monoxide and a carbon-comprising product, wherein one or more hydrocarbons are thermally decomposed and at least part of the pyrolysis gas formed is taken off from the reaction zone of the decomposition reactor at a temperature of from 800 to 1400°C and reacted with carbon dioxide to form a gas mixture comprising carbon monoxide and hydrogen (synthesis gas).
Abstract:
The invention relates to a process for the parallel preparation of hydrogen, carbon monoxide and a carbon-comprising product, wherein one or more hydrocarbons are thermally decomposed and at least part of the pyrolysis gas formed is taken off from the reaction zone of the decomposition reactor at a temperature of from 800 to 1400°C and reacted with carbon dioxide to form a gas mixture comprising carbon monoxide and hydrogen (synthesis gas).
Abstract:
The present invention relates to a method for operating a descending moving bed reactor with flowable granular material, said method comprising the steps of (i) Filling a upper lock-hopper with granular material and/or emptying a lower lock-hopper, (ii) Purging the lock-hoppers with purging gas, (iii) Filling the reaction chamber comprising a descending moving bed from the upper lock-hopper and/or emptying the reaction chamber into the lower lock-hopper, wherein the pressure equalization between the reaction chamber and lock-hopper is achieved with product gas, (iv) optionally Relieving the lock-hoppers and conveying the product gas flow into the product line and (v) Purging the lock-hoppers with purging gas.
Abstract:
Tubo compuesto multicapa con un coeficiente de transición térmica de > 1.000 W/m2/K, que comprende al menos dos capas, una capa interior de cerámica oxidada monolítica no porosa y una capa exterior de cerámica compuesta de fibras oxídica, siendo el grosor de la capa de cerámica compuesta de fibras oxídica de 0,5 mm a 3 mm, en donde el grosor de la capa de cerámica oxidada monolítica es de 0,5 mm a 45 mm, siendo el grosor total de las paredes formado por al menos dos capas de 1 mm a 50 mm, en donde el grosor de la capa de cerámica compuesta de fibras oxídica es inferior al 90% del grosor total de la pared, en donde el diámetro interior de tubo del tubo compuesto es de 20 mm a 1.000 mm, en donde las dos capas están unidas entre sí por fuerza externa o por aportación de material y forman un componente, y en donde por "cerámica compuesta de fibras oxídica" se entiende una matriz de partículas cerámicas oxídicas que contiene fibras cerámicas, oxídicas y/o no oxídicas.
Abstract:
Procedimiento para la preparación de un material zeolítico que contiene hierro con las topologías CHA o LEV, caracterizado porque el dopaje con hierro se realiza a través de una reacción en fase gaseosa usando pentacarbonilo de hierro y el dopaje con hierro se realiza en dos etapas parciales (i) carga en fase gaseosa y (ii) descomposición térmica, caracterizado porque en otra etapa parcial (iii) se hace fluir a través del material zeolítico un gas portante con temperaturas de 500 a 1000 ºC a una presión de 10 a 1.000 kPa, en el que se usa como gas portante vapor de agua.