| 摘要 |
The present invention relates to a novel catalyst composition for use in a nitrogen oxide removal unit (DeNOx), a diesel particulate filter (DPF) and a diesel oxidation catalyst (DOC) unit, as well as a diesel exhaust after-treatment system comprising the same. In the diesel exhaust after-treatment system, the catalyzed ceramic filter ha s a low balance point temperature, and thus it can be operated even at low temperatures without an increase in back pressure. At a lower temperature, it can be continuously regenerated by the injection of heated light oil without applying excessive load to engines. Also, it can efficiently remove carbon monoxide and hydrocarbon with a high efficiency at low temperatures. In addition, according to the present invention, the number of particulate matters of less than 1 D can be decreased by the DOC catalyst honeycomb structure positioned in the rear of the ceramic filter, and nitrogen oxide can be removed by the DeNOx catalyst honeycomb structure positioned in front of the ceramic filter. |
