Intensification of Catalytic Aftertreatments Systems for Mobile Applications

Format:

Conference/Event

Author/Creator:

Maunula, Maunula, author.

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:

Stricter emission limitations for NOx andparticulates in mobile applications will require the use of activeaftertreatment methods like Diesel Particulate Filters (DPF),Selective Catalytic Reduction (SCR) with urea and LeanNOx Trap (LNT) as combinations in the 2010's. Due tothe significant total space and required investments, a lot ofefforts have been focused recently on the optimization of thecombinatory aftertreatment systems (ATS).In this study the possibilities to intensify the catalytic ATSwere analyzed and reviewed by the examples and studies withengines, laboratory reactors and simulations. The focus was ondiesel applications, where the number of needed ATS units is thewidest. The diesel engine modifications on SCR or EGR engines haveto be also designed together with ATS. The intensification includesthe principles of down-sizing and the integration of ATS units withcontrol systems. The reaction engineering of catalytic reaction andregenerations (DPF, LNT) was also analyzed. The intensificationcovered the examples about the integration of DOC, LNT and SCR onDPF, high cell density substrates (metallic) and the integration ofhydrolysis and ammonia slip catalysis on the SCR unit. Theintensification cases were analyzed by the observed catalyticactivities, pressure drop, the volume of systems and costs. The LNTcoating on DPF gave a promising possibility to integrate PM,nitrate and sulfate regeneration methods and OBD. The integrationof control units and their functions is also a modern way to keepemissions, complexity and costs low.The use of natural gas as fuel results in low PM emissions andno DPF is needed in Euro 6. However, the intensification of ATS mayresult in a stoichiometric engine with a three-way catalyst insteadof a lean combustion engine with oxidation and SCR catalysts inheavy-duty natural gas applications

Notes:

Vendor supplied data

Publisher Number:

2013-01-0530

Access Restriction:

Restricted for use by site license