{
  "$type": "site.standard.document",
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  "description": "In an exhaust purification device of an internal combustion engine, a pair of upstream side NO x storage catalysts 15a 15b storing NO x contained in the exhaust gas when the air-fuel ratio of the inflowing exhaust gas is lean and releasing the stored NO x when the air-fuel ratio of the inflowing…",
  "path": "/patents/1007242",
  "publishedAt": "2011-12-14T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9477",
    "TOYOTA MOTOR CO LTD [JP]"
  ],
  "textContent": "In an exhaust purification device of an internal combustion engine, a pair of upstream side NO x storage catalysts 15a 15b storing NO x contained in the exhaust gas when the air-fuel ratio of the inflowing exhaust gas is lean and releasing the stored NO x when the air-fuel ratio of the inflowing exhaust gas becomes the stoichiometric air-fuel ratio or rich are arranged inside an engine exhaust passage. At the downstream side of the upstream side NO x storage catalysts 15a 15b, a downstream side NO x storage catalyst 17 is arranged. The upstream side NO x storage catalysts 15a 15b and downstream side NO x storage catalyst 17 are formed so that the spatial velocity in the downstream side NO x storage catalyst 17 becomes larger than the spatial velocities in the upstream side storage catalysts 15a 15b.",
  "title": "EXHAUST CLEANING DEVICE FOR INTERNAL COMBUSTION ENGINE"
}