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 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 invention relates to a gas-tight multilayer composite tube which has a heat transfer coefficient of > 500 W/m 2 /K and contains at least two layers, one layer made of a nonporous monolithic oxide ceramic and one layer made of an oxide fiber composite ceramic, and relates to a connection piece containing at least one gas-conducting metal line, some regions of which overlap at least two ceramic layers in the longitudinal direction of the composite tube, wherein one ceramic layer contains a nonporous monolithic ceramic, and the other ceramic layer contains a fiber composite ceramic. The invention also relates to the use of the multilayer composite tube as a reaction tube for endothermic reactions, jet tubes, flame tubes, or rotary tubes.