Passive NO<sub>2</sub> Regeneration and NOx Conversion for DPF with an Integrated Vanadium SCR Catalyst

Johansen, Keld; Widd, Anders; Zuther, Frank Ingo; Viecenz, Hannes

doi:10.4271/2016-01-0915

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…Other than Cu and Fe-CHA, V 2 O 5 -WO 3 /TiO 2 (VWT systems) has been suggested for SCRoF applications, noting the slight activity of V towards soot oxidation. The low thermal stability and irreversible deactivation of VWT catalysts above 450 • C due to sintering and phase transition can be cited as their main drawbacks, making their practical application questionable [41][42][43].…”

Section: Scr Catalysts For Scrofmentioning

confidence: 99%

Aftertreatment Technologies for Diesel Engines: An Overview of the Combined Systems

2021

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The abatement of the pollutants deriving from diesel engines in the vehicle sector still represents an interesting scientific and technological challenge due to increasingly limiting regulations. Meeting the stringent limits of NOx and soot emissions requires a catalytic system with great complexity, size of units, and number of units, as well as increased fuel consumption. Thus, an after-treatment device for a diesel vehicle requires the use of an integrated catalyst technology for a reduction in the individual emissions of exhaust gas. The representative technologies devoted to the reduction of NOx under lean-burn operation conditions are selective catalytic reduction (SCR) and the lean NOx trap (LNT), while soot removal is mainly performed by filters (DPF). These devices are normally used in sequence, or a combination of them has been proposed to overcome the drawbacks of the individual devices. This review summarizes the current state of NOx and soot abatement strategies. The main focus of this review is on combined technologies for NOx removal (i.e., LNT–SCR) and for the simultaneous removal of NOx and soot, like SCR-on-Filter (SCRoF), in series LNT/DPF and SCR/DPF, and LNT/DPF and SCR/DPF hybrid systems.

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Section: Scr Catalysts For Scrofmentioning

confidence: 99%

Aftertreatment Technologies for Diesel Engines: An Overview of the Combined Systems

2021

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“…A eficiência de conversão de NOx dos sistemas SCR atuais varia entre 80% e 90% quando a temperatura dos gases de exaustão à jusante do turbo-compressor é superior a 573 K [46,47]. Uma eficiência de conversão de NOx de 97% pode ser alcançada através de um controle otimizado de injeção de Arla 32 em malha fechada [14] e/ou com a introdução de um segundo SCR combinado a um filtro de material particulado [48]. Uma estimativa da eficiência mínima de conversão de NOx necessária para atingir 0,4 g/kWh foi calculada através da equação (3).…”

Section: Casounclassified

Miller cycle and wet ethanol injection for high efficiency and low NOx emissions on a HD diesel engine

Pedrozo¹,

Lanzanova²,

Zhao³

et al. 2021

Blucher Engineering Proceedings

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Costly aftertreatment systems and advanced technologies have been introduced to heavy-duty diesel engines in order to meet stringent emissions and fuel efficiency regulations. To overcome the typical trade-off between exhaust emissions and engine running costs, this study investigated the effects of Miller cycle and wet ethanol injection on a single cylinder diesel engine with a displaced volume of 2 dm 3 . The experiments were performed at 1200 rpm and 24 bar of net indicated mean effective pressure, which corresponds to maximum load of the engine. A variable valve actuation system allowed for the exploration of Miller cycle via late intake valve closing (LIVC). The results revealed that the application of Miller cycle on a diesel-only mode decreased nitrogen oxides (NOx) emissions at the expense of higher soot emissions and lower net indicated efficiency. The combination of Miller cycle and port fuel injection of wet ethanol with 35% (v/v) of water reduced NOx emissions by up to 66% to 4,5 g/kWh while increasing the net indicated efficiency in 1,1%. The relatively lower the levels of NOx emissions also helped to minimise the estimated consumption of aqueous urea solution in the aftertreatment. Overall, the proposed combustion strategy allowed for a high efficiency, low emission, and potentially cost-effective full load engine operation, depending on fuel prices.

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“…of practical SCR aftertreatment systems typically ranges between 80% and 90% [34,39]. Higher conversion of 97% is likely attained with optimised closed loop control of aqueous urea solution injection [6] or with the introduction of an additional flow-through SCR catalyst [40]. The use of low ethanol fractions of 0-30% without EGR resulted in estimated SCR-out ISNOx higher than the Euro VI standard limit of 0.4 g/kWh, independent of the NOx removal efficiency.…”

Section: Cost-benefit and Overall Emissions Analysismentioning

confidence: 99%

Exploring the mid-load potential of ethanol-diesel dual-fuel combustion with and without EGR

2017

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Highlights-Optimised diesel injection timings were identified for efficient dual-fuel combustion.-A pre-injection of diesel prior to the main injection was essential to reduce PRR.-High ethanol energy fractions effectively lowered NOx emissions.-EGR further reduced NOx emissions with negligible impact on the engine efficiency.-Operational cost savings can be achieved and are heavily dependent on fuel prices.

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Passive NO₂ Regeneration and NOx Conversion for DPF with an Integrated Vanadium SCR Catalyst

Cited by 9 publications

References 18 publications

Aftertreatment Technologies for Diesel Engines: An Overview of the Combined Systems

Aftertreatment Technologies for Diesel Engines: An Overview of the Combined Systems

Miller cycle and wet ethanol injection for high efficiency and low NOx emissions on a HD diesel engine

Exploring the mid-load potential of ethanol-diesel dual-fuel combustion with and without EGR

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Passive NO2 Regeneration and NOx Conversion for DPF with an Integrated Vanadium SCR Catalyst

Cited by 9 publications

References 18 publications

Aftertreatment Technologies for Diesel Engines: An Overview of the Combined Systems

Aftertreatment Technologies for Diesel Engines: An Overview of the Combined Systems

Miller cycle and wet ethanol injection for high efficiency and low NOx emissions on a HD diesel engine

Exploring the mid-load potential of ethanol-diesel dual-fuel combustion with and without EGR

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Passive NO₂ Regeneration and NOx Conversion for DPF with an Integrated Vanadium SCR Catalyst