System Approach for NOx Reduction: Double LNT Diesel After-Treatment Architecture

A detailed study of the sulfation and desulfation phenomena of a NOx storage reduction catalyst using synthetic gas bench is presented. The experimental observations and results were put together, in order to develop a model, which can simulate the NOx storage reduction catalyst behavior during the sulfation and desulfation conditions. The target is to use the model for simulation of the lean/rich desulfation strategies, in order to comprehend the complicated phenomena and ultimately predict the sulfur speciation at the outlet of the NOx storage reduction catalyst. Sulfation tests in the presence and in the absence of O2 at different temperatures were conducted, in order to identify the different sulfation sites. Desulfation tests with constantly rich conditions and lean/rich oscillation, using H2 as the reducing gas, were performed in order to investigate the reaction pathways of the decomposition of the sulfates. Additionally, some preliminary investigation was performed using CO and decane in the reducing gas mixture, in order to evaluate the NOx storage reduction behavior under more realistic gas composition for diesel exhaust gas. The important role of the accurate prediction of sulfur axial distribution at the desulfation onset was identified. It was found that cerium oxides play a critical role in the sulfation process by increasing the sulfur capacity of the NOx storage reduction catalyst. Finally, it was clarified that the oxygen stored on cerium oxides strongly affects the selectivity of the desulfation products by oxidizing H2S and controlling H2 availability.

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“…Therefore, the NSR catalyst technology is being investigated and implemented by the automotive industry. 2–5…”

Section: Introductionmentioning

confidence: 99%

Sulfation and lean/rich desulfation of a NO_x storage reduction catalyst: Experimental and simulation study

Lafossas

Manetas

Mohammadi

et al. 2014

International Journal of Engine Research

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“…As significant reduction of mobile source air toxic (MSAT) emissions has been achieved by the installation of a three-way catalyst (TWC) in a spark ignition engine (Cho et al, 2011;Hassaneen et al, 2009;Kwak et al, 2007;Peckham et al, 2011a;Samuel et al,;Takeda et al, 1995) as well as a diesel particulate filter (DPF) and a deNOx catalyst in common rail direct injection (CRDI) engines (Andrew et al, 2009;Austin et al, 2010;Brück et al, 2009;Czerwinski et al, 2011;Di-Penta et al, 2011;Paule et al, 2011). The introduction of higher fuel injection pressures, resulting in smaller fuel droplets, in combination with an improved engine control strategy and a DPF has greatly reduced particulate emissions from diesel engines, whereas gasoline direct injection (GDI) engines produce considerably more particles than conventional port fuel injection (PFI) ones (Basshuysen, 2009;Eastwood, 2008;Peckham et al, 2011b;Sabathil et al, 2011;Zhao, 1999).…”

Section: Introductionmentioning

confidence: 99%

Exhaust nanoparticle emissions from internal combustion engines: A review

Myung

Park

2011

Int.J Automot. Technol.

205

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This paper reviews the particle emissions formed during the combustion process in spark ignition and diesel engine. Proposed legislation in Europe and California will impose a particle number requirement for GDI (gasoline direct injection) vehicles and will introduce the Euro 6 and LEV-III emission standards. More careful optimization for reducing particulate emission on engine hardware, fuel system, and control strategy to reduce particulate emissions will be required during cold start and warm-up phases. Because The diesel combustion inherently produces significant amounts of PM as a result of incomplete combustion around individual fuel droplets in the combustion zone, much attention has been paid to reducing particle emissions through electronic engine control, high pressure injection systems, combustion chamber design, and exhaust after-treatment technologies. In this paper, recent research and development trends to reduce the particle emissions from internal combustion engines are summarized, with a focus on PMP activity in EU, CARB and SAE papers and including both state-of-the-art light-duty vehicles and heavy-duty engines.

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Emissions from DME combustion in diesel engines and their implications on meeting future emission norms: A review

Thomas

Feng

Veeraragavan

et al. 2014

Fuel Processing Technology

121

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System Approach for NOx Reduction: Double LNT Diesel After-Treatment Architecture

Cited by 6 publications

References 9 publications

Sulfation and lean/rich desulfation of a NO_x storage reduction catalyst: Experimental and simulation study

Sulfation and lean/rich desulfation of a NO_x storage reduction catalyst: Experimental and simulation study

Exhaust nanoparticle emissions from internal combustion engines: A review

Emissions from DME combustion in diesel engines and their implications on meeting future emission norms: A review

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System Approach for NOx Reduction: Double LNT Diesel After-Treatment Architecture

Cited by 6 publications

References 9 publications

Sulfation and lean/rich desulfation of a NOx storage reduction catalyst: Experimental and simulation study

Sulfation and lean/rich desulfation of a NOx storage reduction catalyst: Experimental and simulation study

Exhaust nanoparticle emissions from internal combustion engines: A review

Emissions from DME combustion in diesel engines and their implications on meeting future emission norms: A review

Contact Info

Product

Resources

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Sulfation and lean/rich desulfation of a NO_x storage reduction catalyst: Experimental and simulation study

Sulfation and lean/rich desulfation of a NO_x storage reduction catalyst: Experimental and simulation study