{
  "$type": "site.standard.document",
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  "description": "An exhaust gas purifying system includes, an internal combustion engine (1), an exhaust passage of exhaust gas from the internal combustion engine (1), a hydrogen-catalyst (7) provided in the exhaust passage, an NOx purifying catalyst (8) provided on a downstream of the hydrogen-catalyst (7) of the…",
  "path": "/patents/1093899",
  "publishedAt": "2003-08-20T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9431",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "An exhaust gas purifying system includes, an internal combustion engine (1), an exhaust passage of exhaust gas from the internal combustion engine (1), a hydrogen-catalyst (7) provided in the exhaust passage, an NOx purifying catalyst (8) provided on a downstream of the hydrogen-catalyst (7) of the exhaust passage to reduce nitrogen oxides, and a control unit (11). The hydrogen-catalyst (7) has a function of transmitting or generating hydrogen. In the purifying system, the control unit (11) executes enrichment condition control for reducing an air/fuel ratio (A/F)r during enrichment to prolong a time of enrichment (tr) as a flow rate of exhaust gas emitted from the internal combustion engine (1) is lowered in intermittent enrichment of the air/fuel ratio.",
  "title": "Exhaust gas purifying catalyst"
}