Exhaust-gas purification device, method for exhaust-gas purification, catalytic converter and pyrolysis reactor
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsRobert Szolak, Alexander Susdorf, Thomas Aicher
Life of this patent
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Abstract
The present invention relates to an exhaust gas purification device with which combustion gases originating from combustion devices, in particular diesel engines, can be purified. With the exhaust gas purification device, at least one regeneration of the particulate filters and/or of the NOx catalyst can be achieved.
Claims21
An exhaust gas purification device, comprising
- a) at least one pyrolysis reactor which has a catalyst and which, by means of intermittently progressing anaerobic catalytic pyrolysis of combustibles, selected from the group consisting of liquid or gaseous hydrocarbons, oxygen-comprising combustibles (e.g. alcohols, biooils, biodiesels, pyrolysis oils), liquid or gaseous hydrocarbon mixtures or gas mixtures which comprise hydrocarbons, preferably fuels, in particular diesel fuel, and aerobic regeneration of the catalyst, enables the production of a hydrogen-comprising gas mixture and a hydrogen-comprising gas mixture with cracked products from the material used, and
- b) connected subsequent to the pyrolysis reactor
- i. at least one oxidation catalyst and/or a soot particulate filter and/or
- ii. at least one catalyst for reducing the content of nitrous gases (NOx catalyst) and/or
- iii. at least one “Lean NOx Trap (LNT)” and/or a particulate filter,
- the oxidation catalyst and/or the soot particulate filter and/or the NOx storage catalyst and/or LNT and soot particulate filter being disposed in the exhaust gas flow of a combustion device, preferably of an internal combustion engine, in particular of a diesel engine.
A method for exhaust gas purification of exhaust gases originating from a combustion device by soot particulate filter regeneration and/or at least partial removal of soot particulates and/or nitrous gases from the exhaust gases, in which, in the exhaust gas flow of the combustion device, at least one oxidation catalyst and/or one particulate filter and/or at least one catalyst for reducing the content of nitrous gases (NOx catalyst) is arranged, wherein
- the at least one soot particulate filter and/or at least one NOx catalyst is supplied at least temporarily during the combustion process with hydrogen-rich gas mixtures or synthesis gases which are produced by intermittently progressing anaerobic catalytic pyrolysis of combustibles, selected from the group consisting of liquid or gaseous hydrocarbons, liquid or gaseous hydrocarbon mixtures, oxygen-comprising combustibles (e.g. alcohols, biooils, biodiesels, pyrolysis oils) or gas mixtures which comprise hydrocarbons, preferably fuels, in particular diesel fuels, and with carbon monoxide-comprising gas mixtures or synthesis gases which are produced by aerobic regeneration of the catalyst.
A catalyst including a ceramic carrier which is coated at least partially with an alloy, comprising iron and nickel.
Dependencies are inferred from the claim text.