Exhaust gas treatment device, method for processing exhaust gas, and motor vehicle

摘要

The invention relates to an exhaust-gas treatment device for processing exhaust gas from a combustion aggregate, especially a diesel engine. Moreover, the present invention relates to a method for processing exhaust gas from a combustion aggregate by means of selective catalytic reaction, and it also relates to a motor vehicle in which the method according to the invention is implemented or which has the exhaust-gas treatment device according to the invention. It is provided that the exhaust-gas treatment device comprises an exhaust-gas system and, arranged in it, an oxidation catalyst, a reduction catalyst for selective catalytic reduction, and a particle filter, whereby the oxidation catalyst is arranged upstream from the reduction catalyst and the reduction catalyst is arranged upstream from the particle filter. The reduction catalyst (50) is arranged in the exhaust-gas system (20) so far upstream in the direction of flow (23) of the exhaust gas that the heat of the exhaust gas passing the reduction catalyst (50) is sufficient to bring the reduction catalyst (50) to the operating temperature.

主权项

1. An exhaust-gas treatment device for processing exhaust gas from a combustion aggregate, the exhaust-gas treatment device comprising:
an exhaust-gas system having arranged therein an oxidation catalyst, a reduction catalyst configured for selective catalytic reduction and having a metering module configured for metered introduction of a reducing agent, and a particle filter, the metering module having a cooling unit through which a cooling medium flows, wherein the oxidation catalyst is arranged upstream from the reduction catalyst and the reduction catalyst is arranged upstream from the particle filter, wherein the reduction catalyst is arranged in the exhaust-gas system upstream in a direction of flow of the exhaust gas such that heat of the exhaust gas passing the reduction catalyst is sufficient to bring the reduction catalyst to an operating temperature, wherein the exhaust-gas treatment device further comprises a low-pressure exhaust-gas return means having a cooling element flow-connected to the cooling unit of the metering module of the reduction catalyst such that the cooling medium from the cooling element of the low-pressure exhaust-gas return means cools the metering module.