{
  "$type": "site.standard.document",
  "description": "A moisture trap (14), a low temperature NOx trap catalyst (13) and an ordinary NOx trap catalyst (15) are installed in an exhaust passage (12) of an engine (1). The ordinary NOx trap catalyst (15) traps NOx in the exhaust gas above 200 DEG C. The low temperature NOx trap catalyst (13) traps NOx and…",
  "path": "/patents/1101482",
  "publishedAt": "2002-09-25T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9422",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "A moisture trap (14), a low temperature NOx trap catalyst (13) and an ordinary NOx trap catalyst (15) are installed in an exhaust passage (12) of an engine (1). The ordinary NOx trap catalyst (15) traps NOx in the exhaust gas above 200 DEG C. The low temperature NOx trap catalyst (13) traps NOx and moisture in the exhaust gas at a boundary temperature below 200 DEG C, and releases NOx above the boundary temperature. The boundary temperature is higher the higher the moisture content in the exhaust gas during the NOx trapping process, but the NOx trapping capacity decreases the higher the moisture content of the exhaust gas. By causing the moisture trap (14) to reduce the moisture content of the exhaust gas to approximately 1%, the NOx trapping catalyst (13) increases the NOx trapping capacity without lowering the NOx release temperature.",
  "title": "Exhaust gas purification device of internal combustion engine"
}