{
  "$type": "site.standard.document",
  "description": "A catalyst (25) for lowering NOx concentration in an exhaust gas is disposed in an exhaust gas passage (22) of an engine (1). The catalyst (25) is composed of a catalyst layer (25b) formed on a substrate (25a). A NOx absorber that absorbs NOx when an oxygen concentration in the exhaust gas is high…",
  "path": "/patents/1104878",
  "publishedAt": "2002-05-02T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B01D53/9422",
    "MAZDA MOTOR [JP]"
  ],
  "textContent": "A catalyst (25) for lowering NOx concentration in an exhaust gas is disposed in an exhaust gas passage (22) of an engine (1). The catalyst (25) is composed of a catalyst layer (25b) formed on a substrate (25a). A NOx absorber that absorbs NOx when an oxygen concentration in the exhaust gas is high and releases NOx when the oxygen concentration drops, and a precious metal for reducing NOx are supported on a support material as catalyst components, and the NOx absorber includes Ba, K, Sr, and Mg. By lowering the oxygen concentration in the exhaust gas and raising a temperature of the NOx absorber when sulfur component is absorbed excessively in the NOx absorber, it is possible to regenerate the catalyst from the S poisoning.",
  "title": "EXHAUST GAS PURIFYING CATALYST AND PRODUCTION METHOD FOR EXHAUST GAS PURIFYING CATALYST"
}