Physicochemical characteristics according to aging of Fe-zeolite and V2O5–WO3–TiO2 SCR for diesel engines

Seo, Choong-Kil; Choi, Byungchul

doi:10.1016/j.jiec.2014.10.040

Cited by 19 publications

(3 citation statements)

References 28 publications

(31 reference statements)

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“…Some researchers have compared V 2 O 5 -WO 3 -TiO 2 catalysts [19] with two kinds of Fe-zeolite (Fe-zeolite (1) and ( 2)). Their physicochemical characteristics were examined according to hydrothermal aging, sulfur poisoning and HCs co-existence.…”

Section: Introductionmentioning

confidence: 99%

Insights of Selective Catalytic Reduction Technology for Nitrogen Oxides Control in Marine Engine Applications

Napolitano¹,

Liotta

Guido³

et al. 2022

Catalysts

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The international shipping industry is facing increasingly stringent limitations on nitrogen oxide (NOx) emissions. New solutions for reducing NOx emitted by marine engines need to be investigated to find the best technology. Selective Catalytic Reduction (SCR) is an advanced active emissions control technology successfully used in automotive diesel engines; it could be applied to marine engines with ad-hoc solutions to integrate it in the exhaust of large engines. In this study, a commercial SCR was tested at the exhaust of a diesel engine in inlet gas conditions typical of a marine engine. The SCR system consisted of a custom monolith (provided by Hug-Engineering AG) that enabled seamless integration for a broad range of engine sizes; the active phases were V2O5 (3 wt%)-WO3 (7 wt%)-TiO2 (75 wt%). The monolith was studied at the laboratory scale for its in-depth chemical/physical characterization and by means of an intermediate-scale engine, reproducing the exhaust gas conditions of a full-scale marine engine. The system’s effectiveness in terms of NOx removal for the selected engine operating conditions was evaluated in a wide range of temperature and NOx emissions values and for different quantities of the reduction agent (AdBlue or ammonia) added to exhaust gases. The investigated technological solution resulted in efficient NOx emission control from a marine engine.

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Section: Introductionmentioning

confidence: 99%

Insights of Selective Catalytic Reduction Technology for Nitrogen Oxides Control in Marine Engine Applications

Napolitano¹,

Liotta

Guido³

et al. 2022

Catalysts

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show abstract

“…There is no doubt that the NO x reduction activity of the SCR catalyst will significantly decrease after hydrothermal treatment [16][17][18][19][20]. NO x reduction activity of the SCR catalyst is a crucial index that can evaluate the degree of hydrothermal aging of the SCR catalyst.…”

Section: Scr Modelingmentioning

confidence: 99%

Improving the Diagnosis Accuracy of Hydrothermal Aging Degree of V2O5/WO3–TiO2 Catalyst in SCR Control System Using an GS–PSO–SVM Algorithm

Zeng

et al. 2017

Sustainability

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Selective catalytic reduction (SCR) is one of the most effective technologies used for eliminating NO x from diesel engines. This paper presents a novel method based on a support vector machine (SVM) and particle swarm optimization (PSO) with grid search (GS) to diagnose the degree of aging of the V 2 O 5 /WO 3 -TiO 2 catalyst in the SCR system. This study shows the aging effect on the performance of a NH 3 slip based closed-loop SCR control system under different aging factors (α), which are defined by the SCR reaction rate (R scr ). A diagnosis of the performance of GS-PSO-SVM has been presented as compared to SVM, GS-SVM and PSO-SVM to get reliable results. The results show that the average prediction diagnosis accuracy of the degree of catalytic aging is up to 93.8%, 93.1%, 92.9% and 92.0% for GS-PSO-SVM, PSO-SVM, GS-SVM and SVM respectively. It is demonstrated that GS-PSO-SVM is able to identify the SCR catalyst's degree of aging, to ultimately assist with fault tolerance in the aging of the SCR catalyst.

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“…Among these methods, NSR usually requires a large amount of fuel to create a reductive atmosphere. LNT is relatively simple and efficient, but it needs expensive platinum group metal (PGM) (Herreros et al, 2014;Gu et al, 2015;Raptotasios et al, 2015;Seo et al, 2015;Wang et al, 2015;). SCR is considered to be the most efficient technology due to its high efficiency, selectivity and economy, and becomes the leading NOx control strategy for decades (Shakya et al, 2015;.…”

Section: Introductionmentioning

confidence: 99%

Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for SCR of NO with NH3

2017

Global NEST Journal

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V2O5-WO3/TiO2 catalysts were fabricated by a simple impregnation method. Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for selective catalytic reduction (SCR) of NO with NH3 were investigated. Morphology and structure of the V2O5-WO3/TiO2 catalysts were characterised by XRD, SEM, XPS, and N2 adsorption techniques. The XRD patterns of the V2O5-WO3/TiO2 catalyst are indexed to anatase-TiO2. XPS spectra analysis confirms that V, Ti, W and O species exist on the surface of V2O5-WO3/TiO2 catalyst. V2O5 species are the main active sites in the process of SCR reaction. Increasing V2O5 loading in the V2O5-WO3/TiO2 catalysts can improve their catalytic performance. Exceeding 2 wt%, the catalytic performance of V2O5-WO3/TiO2 catalyst begins to decline because high V2O5 loading on TiO2 speeds up the growth of anatase grains, which leads to the loss of catalytic activity. Appropriate WO3 species can significantly improve the catalytic performance of V2O5-WO3/TiO2 catalysts. However, as the WO3 loadings reaches 6 wt%, NO conversion decreases instead.

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Physicochemical characteristics according to aging of Fe-zeolite and V2O5–WO3–TiO2 SCR for diesel engines

Cited by 19 publications

References 28 publications

Insights of Selective Catalytic Reduction Technology for Nitrogen Oxides Control in Marine Engine Applications

Insights of Selective Catalytic Reduction Technology for Nitrogen Oxides Control in Marine Engine Applications

Improving the Diagnosis Accuracy of Hydrothermal Aging Degree of V2O5/WO3–TiO2 Catalyst in SCR Control System Using an GS–PSO–SVM Algorithm

Effects of V2O5 and WO3 loadings on the catalytic performance of V2O5-WO3/TiO2 catalyst for SCR of NO with NH3

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