| 摘要 |
<p>A catalyst converter of a lean oxides of nitrogen (NOx) trap (281) comprising a catalyst substrate coated with a wash-coat with at least two active zones, wherein a rear zone comprises two active components; an oxidation catalyst and an adsorbent, and a minimized oxygen storage capacity (OSC) and wherein a zone immediately before the rear zone comprises an oxidation catalyst, a reduction catalyst, an adsorbent and an oxygen storage capacity. Advantageously the zone immediately before the rear zone has the active components of a standard LNT and therefore is able to produce ammonia by the NOx oxidation during rich combustion mode, and the rear zone is able to maintain ammonia since the low oxygen storage capacity reduces NH3 oxidation and the absence of a reduction catalyst minimises the competitive NH3 consumption reaction in reducing NOx.</p> |
