Regeneration of a model NOX storage/reduction catalyst using hydrocarbons as the reductant

Al‐Harbi, Meshari; Radtke, David; Epling, William S.

doi:10.1016/j.apcatb.2010.03.014

Cited by 26 publications

(24 citation statements)

References 39 publications

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“…Temperatures above 500°C may be periodically required by DPFs for regeneration purposes [13]. Furthermore, the presence of reactive species like hydrogen can enhance the performance of after-treatment devices [14,15]. However, lean-burn engines can have a wide range of exhaust gas temperatures and exhaust gas compositions which may lead to conditions which are not suitable for after-treatment devices.…”

Section: Introductionmentioning

confidence: 98%

A study of the effect of post injection on combustion and emissions with premixing enhanced fueling strategies

Jeftić

Zheng

2015

Applied Energy

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Section: Introductionmentioning

confidence: 98%

A study of the effect of post injection on combustion and emissions with premixing enhanced fueling strategies

Jeftić

Zheng

2015

Applied Energy

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“…The contribution of transportation to SO 2 emissions should be eliminated. There have already been tremendous efforts to reduce the sulfur content in diesel and gasoline fuels nowadays, along with the equipping of vehicular tailpipe technologies like NSR and SCR technologies [66][67]. Fig.…”

Section: Source Apportionmentmentioning

confidence: 99%

Spatiotemporal variations and source apportionment of NOx, SO2, and O3 emissions around heavily industrial locality

Al‐Harbi

Al-majed

Abahussain

2019

Environmental Engineering Research

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The main objective of this study is to estimate the levels of pollution to which the community is presently exposed and to model the regimes of local air quality. Diurnal, daily, and monthly variations of NO, NO2, SO2, and O3 were thoroughly investigated in three areas; namely, residential, industrial, and terminal in Ras Al-Khafji. There is obvious diurnal variation in the concentration of these pollutants that clearly follows the diurnal variation of atmospheric temperature and main anthropogenic and industrial activities. Correlation analysis showed that meteorological conditions play a vital role in shaping the pattern and transportation of air pollutants and photochemical processes affecting O3 formation and destruction. Bivariate polar plots, an effective graphical tool that utilizes air pollutant concentrations' dependence on wind speed and wind direction, were used to identify prevailing emission sources. Non-buoyant ground-level sources like domestic heating and street transport emissions, various industrial stacks, and airport-related activities were considered dominant emission sources in observatory sites. This study offers valuable and detailed information on the status of air quality, which has considerable, quantifiable, and important public health benefits.

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“…2a). Epling et al [30] attributed the inefficient low-temperature rich purge using hydrocarbon reductants to both slow kinetics of propylene reaction with the stored NOx and Pt site poisoning by hydrocarbon intermediates, limiting the regeneration extent.…”

Section: Effect Of Rapid Propylene Injectionmentioning

confidence: 99%

Rapid propylene pulsing for enhanced low temperature NO conversion on combined LNT-SCR catalysts

Zheng

Wang

et al. 2016

Catalysis Today

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Lean reduction of NOx (NO + NO 2) was conducted over combined LNT-SCR dual-layer and zoned monolithic catalysts using rapid propylene periodic pulsing into a lean feed. We investigated the effects of cycling frequency, reaction exotherm, hydrocarbon (HC) intermediates, top-layer material, LNT ceria content and catalyst configuration on the performance of dual-layer catalysts under fast propylene pulsing. High frequency propylene injection expands the operating temperature window of a conventional NOx storage and reduction (NSR) system in both low and high-temperature regions. The combination of rapid propylene pulsing and the dual-layer catalyst architecture achieves a low-temperature NOx conversion of up to 80% at a feed temperature of ca. 200 °C and relevant space velocities (~ 70k h −1). The working mechanisms of rapid propylene pulsing on both LNT and LNT-SCR catalysts are discussed. Fast cycling facilitates the generation of partially oxidized hydrocarbon intermediates over the LNT that can then either directly react with NOx or act as oxygen scavenger to maintain Pt in a reduced state for direct NO decomposition. The SCR top-layer traps partially oxygenated species that desorb from the LNT layer, enabling further production of N 2 through a LNT-assisted HC-SCR pathway. Optimization of ceria content, top-layer material and catalyst configuration like SCR and PGM zoning can improve system performance at lower cost.

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Regeneration of a model NOX storage/reduction catalyst using hydrocarbons as the reductant

Cited by 26 publications

References 39 publications

A study of the effect of post injection on combustion and emissions with premixing enhanced fueling strategies

A study of the effect of post injection on combustion and emissions with premixing enhanced fueling strategies

Spatiotemporal variations and source apportionment of NOx, SO2, and O3 emissions around heavily industrial locality

Rapid propylene pulsing for enhanced low temperature NO conversion on combined LNT-SCR catalysts

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