Reduction process of nitrogen oxides and catalyst for use in this process
Process for reducing nitrogen oxides contained in a lean exhaust gas of an IC engine comprises selectively reducing the nitrogen oxides using ammonia on a reduction catalyst containing a zeolite exchanged with transition metals. A part of the nitrogen monoxide is reduced to nitrogen dioxide before t...
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Main Authors | , , , , , |
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Format | Patent |
Language | Czech English |
Published |
17.04.2002
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Summary: | Process for reducing nitrogen oxides contained in a lean exhaust gas of an IC engine comprises selectively reducing the nitrogen oxides using ammonia on a reduction catalyst containing a zeolite exchanged with transition metals. A part of the nitrogen monoxide is reduced to nitrogen dioxide before the gas is fed together with the ammonia over a reduction catalyst. Oxidation of the nitrogen monoxide is carried out so that the exhaust gas contains 30-70 vol.% nitrogen dioxide before contact with the reduction catalyst. An Independent claim is also included or the process for the production of a reduction catalyst comprising forming an iron-exchanged zeolite, suspending with zirconyl nitrate in water, applying as a coating to a honeycomb body, and calcining the coating. |
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Bibliography: | Application Number: CZ20010001396 |