{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "An amount of ammonia flowing out from an SCR catalyst (5) is reduced at the time of carrying out rich spike control to reduce an amount of NOx stored in an NSR catalyst (4). The NSR catalyst (4) and the SCR catalyst (5) are arranged in order in an exhaust passage (2) of an internal combustion…",
  "path": "/patents/930043",
  "publishedAt": "2017-03-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9418",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "An amount of ammonia flowing out from an SCR catalyst (5) is reduced at the time of carrying out rich spike control to reduce an amount of NOx stored in an NSR catalyst (4). The NSR catalyst (4) and the SCR catalyst (5) are arranged in order in an exhaust passage (2) of an internal combustion engine (1) which is able to be operated at a lean air fuel ratio, wherein a target air fuel ratio of exhaust gas flowing into the NSR catalyst during the rich spike control is made higher within the range of a rich air fuel ratio, in the case where the outflow of ammonia from the SCR catalyst (5) in accompany with the rich spike control is estimated or detected, than in the case where it is not estimated or detected.",
  "title": "EXHAUST GAS PURIFICATION APPARATUS FOR AN INTERNAL COMBUSTION ENGINE"
}