EXHAUST GAS PURIFYING CATALYST FOR SADDLE TYPE VEHICLE

• Main Authors: MITSUKAWA MAKOTO, MIYATA HIROAKI, OHNO DAIGO, ITO SADAAKI, CHAI MAORONG, TSUJI MASATERU, KAWASAKI MUTSURO, MASATANI TADAHISA, HORIMURA HIROYUKI
• Format: Patent
• Language: English; French; German
• Published: 30.10.2013
• Subjects: BLASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; THEIR RELEVANT APPARATUS; TRANSPORTING; WEAPONS

An exhaust gas cleaning catalyst for a saddle-type vehicle, the catalyst including a support; a first catalyst layer formed on a surface of the support; and a second catalyst layer formed on the first catalyst layer, wherein the first catalyst layer includes a carrier formed of a composite oxide having a CeO 2 content of 45 to 70 mass%, a ZrO 2 content of 20 to 45 mass%, an Nd 2 O 3 content of 2 to 20 mass%, and an La 2 O 3 content of 1 to 10 mass%, and a catalyst component which is supported on the carrier and contains metallic Pd or Pd oxide; and the second catalyst layer includes a carrier formed of a composite oxide having a zrO 2 content of 50 to 95 mass%, a CeO 2 content of 0 to 40 mass%, an Nd 2 O 3 content of 2 to 20 mass%, and an La 2 O 3 content of 1 to 10 mass%, and a catalyst component which is supported on the carrier and contains metallic Rh or Rh oxide, or both metallic Rh or Rh oxide and metallic Pt or Pt oxide.