发明名称 EXHAUST GAS PURIFICATION SYSTEM AND METHOD FOR PURIFYING EXHAUST GAS
摘要 A previous-stage oxidation catalyst device, a Diesel Particulate Filter (DPF) device, a turbine of a turbocharger, a previous-stage NOx selective reduction catalyst device, and a subsequent-stage NOx selective reduction catalyst device in an exhaust system of an internal combustion engine in this order from an exhaust port side. An ammonia-based solution feeder is on an inlet side or outlet side of the DPF device. The previous-stage NOx selective reduction catalyst device is a rare earth composite oxide catalyst, and the subsequent-stage NOx selective reduction catalyst device is a zeolite catalyst. The NOx removal rate is improved in wide ranges from low to high temperatures and to high flow rates, and the temperature of the DPF device is kept high to increase the time and frequency of continuous regeneration, thereby reducing the frequency of forced regeneration and an amount of discharge of CO2 during the forced regeneration.
申请公布号 US2015128566(A1) 申请公布日期 2015.05.14
申请号 US201314395546 申请日期 2013.05.07
申请人 ISUZU MOTORS LIMITED 发明人 Osumi Kazuo
分类号 F01N3/20;F01N3/021;B01D53/94 主分类号 F01N3/20
代理机构 代理人
主权项 1. An exhaust gas purification system for removing particulate matter and nitrogen oxides in an exhaust gas of an internal combustion engine, comprising: a previous-stage oxidation catalyst device, a diesel particulate filter device, a turbine of a turbocharger, a previous-stage NOx selective reduction catalyst device, and a subsequent-stage NOx selective reduction catalyst device disposed in an exhaust system of the internal combustion engine in this order from an exhaust port side, an ammonia-based solution feeder disposed between the previous-stage oxidation catalyst device and the diesel particulate filter device or between the diesel particulate filter device and the turbine, and a NOx selective reduction catalyst of the previous-stage NOx selective reduction catalyst device made of a catalyst containing a rare earth composite oxide, and a NOx selective reduction catalyst of the subsequent-stage NOx selective reduction catalyst device made of a zeolite catalyst.
地址 Tokyo JP
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