{
  "$type": "site.standard.document",
  "description": "An exhaust purification system of an internal combustion engine comprising an NO X holding material arranged in an engine exhaust passage, having a catalyst metal containing silver, holding NO X contained in the exhaust gas in the form of silver nitrate by the catalyst metal when an air-fuel ratio…",
  "path": "/patents/1003962",
  "publishedAt": "2012-03-28T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9481",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "An exhaust purification system of an internal combustion engine comprising an NO X holding material arranged in an engine exhaust passage, having a catalyst metal containing silver, holding NO X contained in the exhaust gas in the form of silver nitrate by the catalyst metal when an air-fuel ratio of inflowing exhaust gas is lean, and releasing the held NO X if the air-fuel ratio of the inflowing exhaust gas becomes a stoichiometric air-fuel ratio or rich. The NO X holding material has a scatter temperature at which catalyst metal scatters in the form of silver nitrate if the temperature rises. When it is time to perform control raising the temperature of the NO X holding material to the scatter temperature or above, the NO X held in the NO X holding material is released by making the air-fuel ratio of the exhaust gas flowing into the NO X holding material the stoichiometric air-fuel ratio or rich.",
  "title": "EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE"
}