{
  "$type": "site.standard.document",
  "description": "A NOx catalyst (10) traps nitrogen oxides in the exhaust gas of a diesel engine (40), and particulate matter is trapped by a filter (20). The sulfur poisoning of the NOx catalyst (10) is eliminated using exhaust gas corresponding to a rich air-fuel ratio. The exhaust gas composition is changed over…",
  "path": "/patents/1085889",
  "publishedAt": "2004-06-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N13/009",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "A NOx catalyst (10) traps nitrogen oxides in the exhaust gas of a diesel engine (40), and particulate matter is trapped by a filter (20). The sulfur poisoning of the NOx catalyst (10) is eliminated using exhaust gas corresponding to a rich air-fuel ratio. The exhaust gas composition is changed over to a lean air-fuel ratio according to an increase of a particulate matter collection amount during the elimination of sulfur poisoning so that the particulate matter collection amount in the filter (20) does not increase. As a result, when the particulate matter collection amount decreases due to combustion of collected particulate matter, elimination of sulfur poisoning again proceeds using exhaust gas corresponding to a rich air-fuel ratio.",
  "title": "Device and method for freeing the catalyst of a diesel engine from the effect of sulfur poisoning"
}