EXHAUST EMISSION CONTROL CATALYST DEVICE AND EXHAUST EMISSION CONTROL METHOD

• Main Authors: MATSUMURA MASUHIRO, KAWABATA HISAYA, SHIGETSU MASAHIKO, YAMADA KEIJI
• Format: Patent
• Language: English; Japanese
• Published: 13.10.2016
• Subjects: BLASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; 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; 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; THEIR RELEVANT APPARATUS; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To improve NOx purification performance in a prescribed time after switching to SI combustion mode from HCCI combustion mode where NOx is hardly generated in an exhaust emission control catalyst device including a three-way catalyst and an oxidation catalyst.SOLUTION: In the exhaust emission control catalyst device 27 including a first catalyst 41 and a second catalyst 42, an NOx trap material 71 free from a catalyst metal is disposed upstream relative to the first catalyst 41.SELECTED DRAWING: Figure 1 【課題】三元触媒と酸化触媒とを備えた排気ガス浄化触媒装置において、ＮＯｘが殆ど発生しないＨＣＣＩ燃焼モードからＳＩ燃焼モードに切替わった後の所定時間内におけるＮＯｘ浄化性能を向上させる。【解決手段】第１触媒４１と第２触媒４２とを備えた排気ガス浄化触媒装置２７において、第１触媒４１よりも上流側に触媒金属を含有しないＮＯｘトラップ材７１を配置するようにした。【選択図】図１