Application of a global kinetic model on an SCR coated on Filter (SCR-F) catalyst for automotive applications

Millo, Federico; Rafigh, Mahsa; Fino, Debora; Miceli, Paolo

doi:10.1016/j.fuel.2016.11.082

Cited by 28 publications

(14 citation statements)

References 24 publications

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“…NH 3 was employed as a reducing agent to reduce harmful NOx to harmless N 2 and H 2 O under the synergetic action with O 2 . There were three general reactions, which were called standard SCR, fast SCR, and NO 2 SCR reactions [7,32]. The catalyst performance was found to be a dominant factor for the above-mentioned reactions [11,33].…”

Section: Denitration Mechanism and Performancementioning

confidence: 99%

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Chen

et al. 2020

Polymers

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Development of a novel filter material is urgently required for replacing the high-cost flue gas purification technology in the simultaneous removal of both fine dust and Nitrogen oxides (NOx). In this study; polyphenylene sulfide (PPS) needle-punching fibrous felts (NPFF) were employed as the filter material to remove the fine dust; and in the meanwhile; Mn and Ce oxides were loaded onto the PPS NPFF as the catalyst for selective catalytic reduction of NOx with NH3. Two different pretreatment methods; i.e., sodium alginate (SA) deposition and plasma treatment; were employed to modify the PPS NPFF before the traditional impregnation and thermal treatment processes during the catalyst loading. The results showed that these two pretreatment methods both afforded the PPS NPFF with the enhanced loading rate and stability of Mn/Ce oxides compared to those without any pretreatments; which were significantly beneficial for the denitration application. Moreover; we found that both SA deposition and plasma pre-treated samples presented excellent dust-removal properties; and the filtration efficiency could reach 100% when the particle size of the fine particulates was above 4 μm. This study demonstrated that our Mn/Ce oxides decorated PPS NPFF have great potential to be applied in the fuel gas purification field; due to their stable structure; handling convenience; and excellent filtration efficiency; as well as high denitration performance.

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Section: Denitration Mechanism and Performancementioning

confidence: 99%

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Chen

et al. 2020

Polymers

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“…Only internal purification measures have not been to meet the new emission regulation requirements for NO X emission. Selective Catalytic Reduction (SCR) catalyst is one of the most promising technologies for controlling NOx emissions by using ammonia as an active intermediate for NOx reduction [3]. Based on the national condition, Urea-SCR technology will be the main technical direction of diesel engine emission in the future, because of its high efficiency, high selectivity, high economy and sulfur tolerance [4].…”

Section: Introductionmentioning

confidence: 99%

Urea Injection and Uniformity of Ammonia Distribution in SCR System of Diesel Engine

Jiao

Zheng

2020

Applied Mathematics and Nonlinear Sciences

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The kinetic mechanism of chemical reaction was used to calculate the coupling of the fluid kinetics with the urea decomposition reaction and the SCR reaction kinetics. Combined with the engine test and simulation, the distribution uniformity of the urea injection and ammonia gas was studied. Through numerical simulation on urea spray and exhaust flow in Urea-SCR system, the flow field characteristics in whole after-treatment system are gotten. By using numerical calculation in different urea injection angle and orifice sizes, the urea-crystallization and ammonia distribution have been studied and the optimal urea spray angle and nozzle size are given.

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“…Thus, three ammonia oxidation reactions are assumed. Duffy et al [6], using V 2 O 5 /TiO 2 catalysts with varying vanadia contents, also used isotopic labelling studies to conclude that below 300°C 14 N 15 N is always the first product from 15 NO and 14 NH 3 . At higher temperatures, the product distribution is susceptible to the vanadia content of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Simulating the Effects of Poisoning on the Rate of the Oxidation of Ammonia over a V2O5/TiO2 Monolithic Diesel SCR Catalyst Using a Multichannel Model

Odenbrand¹

2020

AJCHE

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The background to this study is the need to find out if some reactions of O 2 oxidation of ammonia oxidation are important in the Selective Catalytic Reduction (SCR) of NO by NH 3 . The objective of the study was to shed light on the influence of poisoning on these reactions over a diesel SCR catalyst by compounds in the exhaust gases. The method used was to experimentally determine the amounts of products formed at several temperatures and compared them to simulated values. About 700 ppm NH 3 was oxidized by 2% O 2 in helium yielding N 2 , N 2 O, and NO at increasing temperatures. Comparisons are given for a 4.56% vanadia on titania fresh catalyst and the ones used for 890 and 2299 h. The kinetics was simulated using a multichannel model of the monolithic catalyst. The experimental values of the products were nicely fitted by the kinetic model where all three ammonia oxidation reaction rates were of the first order in the concentration of ammonia. The fit was somewhat better for the non-isothermal case than the isothermal one. The deactivation reduces the activation energies for the formation of all products. Effects of flow and concentration maldistribution are shown to be present but are quite small. The temperature increase is 1.30 K for the most active catalyst at the highest temperature (733 K). The use of the multichannel model shows that quite considerable deviations in inlet ammonia concentrations are obtained over the catalyst cross section. This means that the catalyst is not used to its full potential.

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Application of a global kinetic model on an SCR coated on Filter (SCR-F) catalyst for automotive applications

Cited by 28 publications

References 24 publications

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Urea Injection and Uniformity of Ammonia Distribution in SCR System of Diesel Engine

Simulating the Effects of Poisoning on the Rate of the Oxidation of Ammonia over a V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> Monolithic Diesel SCR Catalyst Using a Multichannel Model

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Application of a global kinetic model on an SCR coated on Filter (SCR-F) catalyst for automotive applications

Cited by 28 publications

References 24 publications

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Mn/Ce Oxides Decorated Polyphenylene Sulfide Needle-Punching Fibrous Felts for Dust Removal and Denitration Application

Urea Injection and Uniformity of Ammonia Distribution in SCR System of Diesel Engine

Simulating the Effects of Poisoning on the Rate of the Oxidation of Ammonia over a V&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;/TiO&lt;sub&gt;2&lt;/sub&gt; Monolithic Diesel SCR Catalyst Using a Multichannel Model

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Simulating the Effects of Poisoning on the Rate of the Oxidation of Ammonia over a V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> Monolithic Diesel SCR Catalyst Using a Multichannel Model