Technical Advantages of Urea SCR for Light-Duty and Heavy-Duty Diesel Vehicle Applications

Lambert, Christine; Hammerle, R. H.; McGill, R.N.; Khair, Magdi; Sharp, Christopher

doi:10.4271/2004-01-1292

Cited by 85 publications

(36 citation statements)

References 13 publications

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“…The technical advantages of urea SCR over lean NO x traps are discussed by Lambert, Hammerle, McGill, Khair, and Sharp (2004). They include a wider operating temperature range, a lower fuel economy penalty, higher sulfur tolerance, and higher durability.…”

Section: No X Aftertreatmentmentioning

confidence: 98%

Chemical characterization of particulate emissions from diesel engines: A review

Maricq

2007

Journal of Aerosol Science

756

133

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Section: No X Aftertreatmentmentioning

confidence: 98%

Chemical characterization of particulate emissions from diesel engines: A review

Maricq

2007

Journal of Aerosol Science

756

133

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“…With a DPF a very efficient elimination of solid particles (particle counts filtration efficiency (PCFE) up to 99.99 %) and with SCR a substantial reduction of NO x (K NOx over 90 %) are possible. Intense developments are on the way by the original equipment manufacturers (OEMs), and investigations were performed [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Dpf+scrmentioning

confidence: 99%

Emission Reduction with Diesel Particle Filter with SCR Coating (SDPF)

Czerwiński

Zimmerli

Mayer³

et al. 2015

Emiss. Control Sci. Technol.

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The present paper informs about some results obtained with selective catalytic reduction (SCR) and with SDPF (a diesel particle filter (DPF) with SCR coating) on a medium duty research engine Iveco F1C. This work is a first attempt at evaluating the effects of a SDPF on non-legislated gaseous emissions and on secondary nanoparticles. Beside the limited gaseous emission components, NH 3 , NO 2 , and N 2

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“…As has been well documented elsewhere [1,2], two main technologies are currently used to reduce lean NOx emissions from mobile sources. Selective catalytic reduction (SCR) relies on the use of externally added urea which decomposes in situ to CO2 and NH3, the latter functioning as an excellent reductant for NOx in the presence of a suitable catalyst.…”

Section: Introductionmentioning

confidence: 99%

Pt/Ce Pr1−O2 (x= 1 or 0.9) NO storage–reduction (NSR) catalysts

Rico-Pérez

Bueno‐López

Kim

et al. 2015

Applied Catalysis B: Environmental

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Model Pt/Ce0.9Pr0.1O2 and Pt/CeO2 NOx storage-reduction catalysts were prepared via nitrate calcination, co-precipitation and carbon-templating routes.Raman spectroscopic data obtained on the catalysts indicated that the introduction of praseodymium into the ceria lattice increased the concentration of defect sites (vacancies), arising from the higher reducibility of the Pr 4+ cation compared to Ce 4+ . For the Pr-promoted samples, H2-TPR profiles contained high temperature bulk reduction peaks which were less pronounced compared with their ceria analogs, indicating that the presence of praseodymium enhances oxygen mobility due to the creation of lattice defects. Under lean-rich cycling conditions, the cycle-averaged NOx conversion of the Pt/Ce0.9Pr0.1O2samples was in each case substantially higher than that of the Pt/CeO2 analog, amounting to a difference of 10-15% in the absolute NOx conversion in some cases. According to DRIFTS data, a double role can be assigned to Pr doping; on the one hand, Pr accelerates the oxidation of adsorbed NOx species during the lean periods. On the other hand, Pr doping destabilizes the adsorbed NOx species during the rich periods, and the kinetics of nitrate decomposition are faster on Pt/Ce0.9Pr0.1O2, leading to improved catalyst regeneration. These results suggest that ceria-based mixed oxides incorporating Pr are promising materials for NOx storage-reduction catalysts intended for low temperature operation.

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Technical Advantages of Urea SCR for Light-Duty and Heavy-Duty Diesel Vehicle Applications

Cited by 85 publications

References 13 publications

Chemical characterization of particulate emissions from diesel engines: A review

Chemical characterization of particulate emissions from diesel engines: A review

Emission Reduction with Diesel Particle Filter with SCR Coating (SDPF)

Pt/Ce Pr1−O2 (x= 1 or 0.9) NO storage–reduction (NSR) catalysts

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