Exhaust purification device of an internal combustion engine

• Main Authors: NAKANISHI; KIYOSHI, KIHARA; TETSURO, NOHIRA; HIDETAKA, KATOH; KENJI, MURAKI; HIDEAKI, INOUE; TOKUTA, IGUCHI; SATOSHI
• Format: Patent
• Language: English
• Published: 09.05.1995
• Edition: 6
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; WEAPONS

PCT No. PCT/JP92/01710 Sec. 371 Date Aug. 26, 1993 Sec. 102(e) Date Aug. 26, 1993 PCT Filed Dec. 25, 1992 PCT Pub. No. WO93/12863 PCT Pub. Date Jul. 8, 1993.A NOx absorbent (18) which absorbs the NOx when the air-fuel ratio of the exhaust gas flowing into the NOx absorbent (18) is lean and releases the absorbed NOx when the oxygen concentration of the exhaust gas flowing into the NOx absorbent (18) is lowered, is arranged in the exhaust passage of the engine. The amount of alkali metals, alkali-earth metals or rare-earth metals contained in the NOx absorbent (18) positioned on the downstream side, is made lower than the amount of alkali metals, alkali-earth metals or rare-earth metals contained in the NOx absorbent (18) positioned on the upstream side, to increase a reducing ability of the NOx absorbent (18) positioned on the downstream side as compared to the reducing ability of the NOx absorbent (18) positioned on the upstream side.