EXHAUST GAS PURIFYING CATALYST

• Main Authors: HOUSHITO, OHKI, HORIMURA, HIROYUKI, KIMURA, TOSHIAKI, IIMURO, AKIHIRO, NAKAHARA, YUNOSUKE, OSHIMA, RYOICHI, YAMAGUCHI, TAKUMI, ENDO, TAKESHI
• Format: Patent
• Language: English; French
• Published: 16.06.2016
• 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

To reduce an OSC material, while maintaining necessary OSC capacity; and to improve heat resistance and reactivity of a noble metal. Proposed is an exhaust gas purifying catalyst which comprises: a first catalyst layer that is formed on the surface of a base that is formed of a ceramic or a metal; and a second catalyst layer that is formed on top of the first catalyst layer. The first catalyst layer contains a noble metal, while containing an OSC material and alumina at a mass ratio of from 1:7 to 1:3. The second catalyst layer contains a noble metal, while containing an OSC material and alumina at a mass ratio of from 1:1 to 10:0.