Improvement of Low-Temperature Performance of The NOx Reduction Efficiency on the Urea-SCR Catalysts Hino Motors, Limited

Format:

Conference/Event

Author/Creator:

Sato, Sato, author.

Contributor:

Hosoya, Mitsuru

Sato, Shinya

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

Diesel engine has a good fuel economy and high durability andused widely for power source such as heavy duty in the world. Onthe other hand, it is required to reduce NOx (Nitrogen Oxides) andPM (Particulate Matter) emissions further from diesel exhaust gasesto preserve atmosphere. The urea-SCR (Selective CatalyticReduction) system is the most promising measures to reduce NOxemissions. DPF (Diesel Particulate Filter) system is commercializedfor PM reduction. However, in case that a vehicle has a slow speedas an urban area driving, a diesel exhaust temperature is too lowto activate SCR catalyst for NOx reduction in diesel emissions.Moreover, the diesel exhaust temperature becomes lower as a futureengine has less fuel consumption.The purpose of this study is reduction of NOx emission from aheavy-duty diesel engine using the Urea SCR system at the lowtemperature. The performance of NOx reduction especially at lowtemperature was investigated to the influence of NOx/NO ratio atthe inlet of Urea-SCR catalyst and the effect of NH₃ adsorption onthe Urea-SCR catalyst. The SCR catalysts were coated by the zeolitewith different active metals. The performance of NOx reduction atlow temperature was observed by the effect of NOx/NO ratio at theinlet gas of Urea-SCR catalyst and the NH₃ adsorption on theUrea-SCR catalysts.The NOx reduction efficiency was tested using simulated gasexperiment. In this study, the improvement of NOx reductioncatalyst at the low temperature is discussed about tested newmaterial catalysts. These catalysts were selected from theviewpoints of NH₃ and NO adsorption amounts. Drastic NOx reductionefficiency improvement at low temperature (around 200 degree C)would be achieved using copper zeolite catalyst. The next step,emissions reduction effect was discussed from the results of theengine experiments under steady-state and transient conditions. Thelatest results and problems were reported with the results from thesimulated gas experiments and engine experiments

Notes:

Vendor supplied data

Publisher Number:

2013-01-1076

Access Restriction:

Restricted for use by site license