Enhanced NOx removal efficiency for SCR catalyst of well-dispersed Mn-Ce nanoparticles on hexagonal boron nitride

Lee, Myeung-jin; Kim, Dohyun; Lee, Minwoo; Ye, Bora; Jeong, Bora; Lee, DuckHyun; Kim, Hong-Dae; Lee, Heesoo

doi:10.1007/s11356-019-04619-y

Cited by 14 publications

(10 citation statements)

References 47 publications

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“…Air pollution has recently become a critical, global issue [1]. In response, environmental regulations have been tightened to reduce the emissions of chemical impurities (such as NO X , SO x , CO, volatile organic compounds (VOCs), and particulate matter (PM)) from power plants, boilers, and mobile sources [2,3]. Among the numerous air pollutants, nitrogen oxides (NO X : NO, NO 2 , and N 2 O) are extremely dangerous as they can easily disperse over long distances and form secondary PM 2.5 by reacting with water vapor, which causes acid rain and smog, contributes to global warming [4,5], and can deeply penetrate human lungs, causing adverse health effects such as increased cardiovascular and respiratory morbidity [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Catalyst Crystallinity on V-Based Selective Catalytic Reduction with Ammonia

et al. 2021

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In this study, we synthesized V2O5-WO3/TiO2 catalysts with different crystallinities via one-sided and isotropic heating methods. We then investigated the effects of the catalysts’ crystallinity on their acidity, surface species, and catalytic performance through various analysis techniques and a fixed-bed reactor experiment. The isotropic heating method produced crystalline V2O5 and WO3, increasing the availability of both Brønsted and Lewis acid sites, while the one-sided method produced amorphous V2O5 and WO3. The crystalline structure of the two species significantly enhanced NO2 formation, causing more rapid selective catalytic reduction (SCR) reactions and greater catalyst reducibility for NOX decomposition. This improved NOX removal efficiency and N2 selectivity for a wider temperature range of 200 °C–450 °C. Additionally, the synthesized, crystalline catalysts exhibited good resistance to SO2, which is common in industrial flue gases. Through the results reported herein, this study may contribute to future studies on SCR catalysts and other catalyst systems.

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Section: Introductionmentioning

confidence: 99%

Effect of Catalyst Crystallinity on V-Based Selective Catalytic Reduction with Ammonia

et al. 2021

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“…Most energy is generated through the combustion of fossil fuels, which causes air pollution by emitting toxic pollutants, such as NO X , particulate matter, SO X , and CO [1,2]. Nitrogen oxides (NO, NO 2 , and N 2 O) are the most representative air pollutants because they are major causes of acid rain, photochemical smog, ozone depletion, and global warming [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

et al. 2021

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Selective catalytic reduction (SCR) is the most efficient NOX removal technology, and the vanadium-based catalyst is mainly used in SCR technology. The vanadium-based catalyst showed higher NOX removal performance in the high-temperature range but catalytic efficiency decreased at lower temperatures, following exposure to SOX because of the generation of ammonium sulfate on the catalyst surface. To overcome these limitations, we coated an NH4+ layer on a vanadium-based catalyst. After silane coating the V2O5-WO3/TiO2 catalyst by vapor evaporation, the silanized catalyst was heat treated under NH3 gas. By decomposing the silane on the surface, an NH4+ layer was formed on the catalyst surface through a substitution reaction. We observed high NOX removal efficiency over a wide temperature range by coating an NH4+ layer on a vanadium-based catalyst. This layer shows high proton conductivity, which leads to the reduction of vanadium oxides and tungsten oxide; additionally, the NOX removal performance was improved over a wide temperature range. These findings provide a new mothed to develop SCR catalyst with high efficiency at a wide temperature range.

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“…However, they still exhibit some major shortcomings, such as a narrow working temperature range (300-400°C), toxic effects of vanadium on the ecological environment and human health, high toxicity of active vanadium substances, and low N 2 selectivity at higher temperatures (Jiang et al 2019). Cerium is frequently utilized due to its excellent oxygen-storage capacity and high redox capacity via the reduction of Ce 4+ to Ce 3+ (Lee et al 2019, Lei et al 2020). In addition, cerium dioxide can be used as the active ingredient in the SCR reaction; hence, it has been extensively investigated (Chen et al 2015).…”

Section: Introductonmentioning

confidence: 99%

Remarkable Enhancement In The N2- Selectivity of NH3-SCR Over The CeNb3Fe0.3/TiO2 Catalyst In The Presence of Chlorobenzene

Zang

Liu

et al. 2021

Preprint

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The simultaneous removal of NOx and dioxins is the frontier of environmental catalysis, which is still in the initial stage and poses several challenges. In this study, a series of CeNb3Fex/TiO2 (x = 0, 0.3, 0.6, and 1.0) catalysts were prepared by the sol-gel method and examined for the synergistic removal of NOx and chlorobenzene. The CeNb3Fe0.3/TiO2 catalyst exhibits an optimum catalytic performance, with an NOx conversion greater than 95 % at 260-380 °C. It also exhibited an optimal CB oxidation activity, in which CB promoted both the NOx conversion and N2 selectivity below 250 °C. Moreover, the more favourable ratios of Ce4+ to Ce3+, and plentiful surface adsorbed oxygen species are the reasons why CeNb3Fe0.3/TiO2 catalyst has better catalytic activity than other catalysts at lower temperature. Simultaneously, owing to the modulation of Fe to the redox properties of Ce and Nb, the large number of oxygen vacancies and acid sites, the CeNb3Fe0.3/TiO2 catalyst is is beneficial to NOx reduction and CB oxidation. Further, the results of in situ DRIFTS study reveal the NH3-SCR reactions over CeNb3Fex/TiO2 catalysts are mainly controlled by the L-H mechanism (< 200 °C) and E-R mechanism (> 200 °C), respectively.

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Enhanced NOx removal efficiency for SCR catalyst of well-dispersed Mn-Ce nanoparticles on hexagonal boron nitride

Cited by 14 publications

References 47 publications

Effect of Catalyst Crystallinity on V-Based Selective Catalytic Reduction with Ammonia

Effect of Catalyst Crystallinity on V-Based Selective Catalytic Reduction with Ammonia

Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

Remarkable Enhancement In The N2- Selectivity of NH3-SCR Over The CeNb3Fe0.3/TiO2 Catalyst In The Presence of Chlorobenzene

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