{
  "$type": "site.standard.document",
  "description": "A decrease in an NOx removal or reduction rate at the time of filter regeneration is suppressed. To this end, provision is made for an NOx selective reduction catalyst, a filter arranged at the upstream side of the NOx selective reduction catalyst, an NH 3 generation catalyst arranged at the…",
  "path": "/patents/952627",
  "publishedAt": "2015-01-14T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9431",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "A decrease in an NOx removal or reduction rate at the time of filter regeneration is suppressed. To this end, provision is made for an NOx selective reduction catalyst, a filter arranged at the upstream side of the NOx selective reduction catalyst, an NH 3 generation catalyst arranged at the upstream side of the NOx selective reduction catalyst to generate NH 3 when the air fuel ratio of an exhaust gas is equal to or less than a stoichiometric air fuel ratio, a regeneration unit to carry out regeneration of the filter, and a generation unit to make the air fuel ratio of the exhaust gas equal to or less than the stoichiometric air fuel ratio, thereby causing NH 3 to be generated in the NH 3 generation catalyst, wherein the regeneration unit inhibits the regeneration of the filter until the generation of NH 3 by the generation unit is completed.",
  "title": "EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE"
}