Catalyst system and use thereof
A catalytic converter and oxidation catalytic converter technology, applied to catalytic converter systems and their application fields, can solve the problems of deterioration of conversion, premature aging of catalytic converters, etc.
Active Publication Date: 2010-01-20
UMICORE AG & CO KG
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Problems solved by technology
Here, high temperature peaks occur inside the oxidation catalytic converter, which temperature peaks can lead to premature aging of the catalytic converter
In this way, the conversion of hydrocarbons and carbon monoxide on the oxidation catalytic converter deteriorates with increasing operating hours
Method used
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Embodiment Construction
[0024] The drawing shows an exhaust system 1 of a diesel engine. The exhaust system comprises a first converter housing 2 in which two oxidation-active catalytic converters 3 and 4 are located and spaced apart from each other. The distance d between the two catalytic converters is in the range between 2-30 mm. The two catalytic converters can be of the same or different lengths. A second converter housing 5 with a soot filter 6 is located downstream of the catalytic converter system. The downstream soot filter can be actively regenerated by burning additional fuel in the catalytic converter system.
[0025] example
[0026] In a diesel vehicle with a displacement of 2.2 liters, the residual emissions of the three catalytic converter systems were compared with each other in the New European Driving Cycle (NEDC). As the catalytic converter carrier, all used is a honeycomb body made of cordierite, the honeycomb body has a cell density of 62cm-2 and a tube wall thickness of ...
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Particle filters (6) for the removal of particulates from the exhaust gas of lean burn engines become blocked with the deposit of particulates with increasing operation time and must be regularly regenerated. It has been shown that a reliable operation of the particle filter is only possible when, from time to time, an active regeneration by increasing the exhaust gas temperature to the particulate ignition temperature is carried out. For this purpose, an oxidation catalyst (2) is normally arranged before the particle filter (6) and the exhaust gas temperature increased by catalytic combustion of additional injected fuel. The oxidation catalyst (2) is thus subjected to high thermal loads and hence ages rapidly. Surprisingly it has been shown that the aging of the oxidation catalyst (2) can be delayed when the same is divided into at least two separate catalysts and the separation between them is 2 to 30mm.
Description
technical field [0001] The invention relates to a catalytic converter system comprising at least two catalytic converters in a common converter housing, the catalytic converters being located in the exhaust gas They are arranged in series and spaced apart from each other in the direction of flow, and can burn hydrocarbons and carbon monoxide in the lean exhaust gas in a catalytic reaction. Catalytic converter systems are used in the exhaust system of diesel engines to heat the exhaust gas to the ignition temperature of the soot so that the downstream soot filter can be actively refreshed. Background technique [0002] The soot produced by diesel engines must be removed from the exhaust by a soot filter to prevent polluting the air. As soot deposits in the filter increase, the exhaust back pressure created by the filter increases, reducing engine power. Therefore, the filter must be periodically regenerated by burning off the soot. [0003] This update recovery is a proble...
Claims
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IPC IPC(8): F01N3/035F01N3/20F01N3/28
CPCF01N2610/03F01N2510/0682F01N3/101F01N2430/085F01N2013/023F01N3/2803F01N2340/02F01N3/035F01N2013/026F01N3/0253Y02T10/22F01N13/0097F01N13/0093Y02T10/12F01N3/20F01N3/28
Inventor P·施普克S·弗朗茨T·勒塔莱克O·泰塞特W·米勒G·耶斯克
Owner UMICORE AG & CO KG