Diesel NOx-Storage Catalyst Systems for Tier 2 BIN5 Legislation

Rohr, F.; Grißtede, I.; Sundararajan, Aditya; Müller, W.

doi:10.4271/2008-01-0766

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…The reverse zoning protected the high loaded zone in the rear from sintering via the exothermic heat generated by hydrocarbons and CO oxidation, thus preserving the low temperature performance of the LNT . Other work evaluated staging LNT bricks upstream and downstream of the DPF . In this way, NO x generated from DPF regeneration was reduced.…”

Section: Selective Catalytic Reduction (Scr) and Lean Nox Trap (Lnt) mentioning

confidence: 99%

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Hazlett

Epling

2018

Can J Chem Eng

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There have been ongoing research efforts focused on layering or zoning different washcoats/active metals on the catalysts constituting diesel aftertreatment systems: the diesel oxidation catalyst (DOC), the selective catalytic reduction (SCR) catalyst, the lean NOX trap (LNT), the ammonia slip catalyst (ASC), and the diesel particulate filter (DPF). This review paper aims to shed insight into the state‐of‐the‐art research on catalyst design in this area and how these catalyst designs may evolve to tackle engine emission reductions in the future. First, we discuss the motivation for zoning or layering catalysts and pioneering work on three‐way catalyst (TWC) design for reducing gasoline engine emissions; then, we focus on the catalytic systems used for diesel exhaust aftertreatment. The configuration of the aftertreatment systems for diesel engines generally consist of an oxidation catalyst for hydrocarbon (HC), CO, and NO oxidation (over the DOC), a NOX reduction catalyst (over one or combined SCR/LNT/ASC catalysts), and a particulate matter (PM) filter (using a DPF). The research to date consistently demonstrates that zoning and layering catalyst regions leads to improved performance and/or smaller system volumes required.

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Section: Selective Catalytic Reduction (Scr) and Lean Nox Trap (Lnt) mentioning

confidence: 99%

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Hazlett

Epling

2018

Can J Chem Eng

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“…4 To satisfy the current NO x emission regulations on diesel vehicles, advanced in-cylinder combustion control strategies, such as exhaust gas recirculation (EGR) 5,6 and the use of alternate fuels, 7,8 have been developed and used in production engines. Nevertheless, after-treatment solutions [9][10][11][12] are inevitable to meet the EPA NO x emission regulations for heavy duty on-highway diesel at all engine load levels.…”

Section: Introductionmentioning

confidence: 99%

Lean NO_x trap supplemental energy savings with a long breathing strategy

Jeftić

Zheng

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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Current and upcoming diesel engine emission regulations in the USA and in Europe stipulate significant reductions of nitrogen oxide emissions. To satisfy these emission regulations and to maintain high fuel efficiency, energy efficient diesel after-treatment to remove nitrogen oxides is required. In this study, a long breathing (long adsorption) strategy was investigated for the reduction of supplemental energy consumption of a diesel lean nitrogen oxide trap. The long breathing strategy would be enabled by moderate exhaust gas recirculation to reduce the engine-out nitrogen oxide levels. With reduced feed gas nitrogen oxide levels, the adsorption time of the lean nitrogen oxide trap could be extended, leading to less frequent fuel-rich regeneration of the lean nitrogen oxide trap. Proof of concept studies were undertaken on a diesel engine to demonstrate the enabling of the long breathing lean nitrogen oxide trap strategy, while further tests were undertaken on a flow bench set-up to demonstrate the potential energy savings with the long breathing lean nitrogen oxide trap strategy. The test results indicated that, at the selected operating conditions, the long breathing strategy could be enabled by reducing the engine-out nitrogen oxide from 110 ppm to 50 ppm via moderate exhaust gas recirculation. The flow bench test results indicated that the adsorption time of the lean nitrogen oxide trap increased exponentially when the feed gas nitrogen oxide level was reduced. The longer adsorption led to supplemental energy savings in excess of 60% when the feed gas nitrogen oxide level was reduced from 110 ppm to 50 ppm. Furthermore, it was calculated that the long breathing lean nitrogen oxide trap strategy enabled a higher overall indicated efficiency of 36.4% compared to 35.9% with a conventional lean nitrogen oxide trap strategy.

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Emissions from premixed charge compression ignition (PCCI) combustion and affect on emission control devices

et al. 2010

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Diesel NOx-Storage Catalyst Systems for Tier 2 BIN5 Legislation

Cited by 10 publications

References 5 publications

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Lean NO_x trap supplemental energy savings with a long breathing strategy

Emissions from premixed charge compression ignition (PCCI) combustion and affect on emission control devices

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Diesel NOx-Storage Catalyst Systems for Tier 2 BIN5 Legislation

Cited by 10 publications

References 5 publications

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Heterogeneous catalyst design: Zoned and layered catalysts in diesel vehicle aftertreatment monolith reactors

Lean NOx trap supplemental energy savings with a long breathing strategy

Emissions from premixed charge compression ignition (PCCI) combustion and affect on emission control devices

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Product

Resources

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Lean NO_x trap supplemental energy savings with a long breathing strategy