SCR CATALYST AND EXHAUST GAS PURIFICATION CATALYST SYSTEM

• Main Authors: YAMASHITA YOSHINORI, TRAN MAI HUONG, AONO NORIHIKO
• Format: Patent
• Language: English; Japanese
• Published: 09.11.2015
• 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

PROBLEM TO BE SOLVED: To provide an SCR catalyst that has a high purification capability, and to provide an exhaust gas purification catalyst system that includes said SCR catalyst.SOLUTION: A exhaust gas purification catalyst system 1 includes an internal combustion engine 2 for discharging exhaust gas, a DOC3, a DPF4, a urea addition valve 6 for adding urea water into exhaust gas flow passage (exhaust pipe 5), an SCR catalyst 7, and an ASC catalyst 8; the SCR catalyst comprises an iron ion exchange zeolite and a solid acid; said SCR catalyst has an acid amount determined from the desorption amount at 300 to 700°C which is measured by an ammonia temperature-programmed desorption method (NH-TPD), of 112 mmol or more and 160 mmol or less per catalyst volume of 1 L. 【課題】 高い浄化性能を有するＳＣＲ用触媒、及び当該ＳＣＲ用触媒を備える排ガス浄化触媒システムを提供する。【解決手段】 排ガス浄化触媒システム１は、排気ガスを排出する内燃機関２、ＤＯＣ３、ＤＰＦ４、尿素水を排気流路（排気管５）中に添加する尿素添加弁６、ＳＣＲ用触媒７、およびＡＳＣ触媒８を含む。ＳＣＲ用触媒は、鉄イオン交換ゼオライトと、固体酸と、を含む。上述したＳＣＲ用触媒は、アンモニア昇温脱離法（ＮＨ3−ＴＰＤ）により測定される３００〜７００℃における脱離量から求められる酸量が、触媒容積１Ｌあたり１１２ｍｍｏｌ以上１６０ｍｍｏｌ以下である。【選択図】図１