NOx abatement from stationary emission sources by photo-assisted SCR: Lab-scale to pilot-scale studies

Yu, Joseph Che-Chin; Nguyen, Van‐Huy; Lasek, Janusz; Chiang, Sheng-Wei; Li, Duanxing; Wu, Jeffrey C.S.

doi:10.1016/j.apcata.2016.06.020

Cited by 22 publications

(9 citation statements)

References 34 publications

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“…(a)UV–vis spectra of CQDs, N-CQDs, PrFeO 3 /Pal, and N-CQDs/PrFeO 3 . (b) Evaluation of band gap with (A h ν) versus h ν.…”

Section: Resultsmentioning

confidence: 99%

“…The emission of nitrogen oxides (NO x ) is a worldwide concern and has become the main cause for the origination of acid rain, solid particles PM2.5, and photochemical smog, which impose serious threats to the ecological environment and human health. , Selective catalytic reduction (SCR) has been employed for NO x removal for several decades. , However, there are significant challenges remaining to be resolved for the SCR methods, including a high temperature window, risk of ammonia leakage, and excessive consumption of thermal energy. , …”

Section: Introductionmentioning

confidence: 99%

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Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Shi

Yan

et al. 2018

ACS Sustainable Chem. Eng.

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Photocatalysis-selective catalytic reduction (photo-SCR) of NO x is recognized as a potential approach for the abatement of nitrogen oxides. However, the development of an efficient photocatalyst for photo-SCR is strongly desired. In the current work, nitrogen-doped carbon quantum dots (N-CQDs)-modified PrFeO3 /palygorskite (Pal) was prepared by a sol–gel/impregnation method. Results indicate that Pal nanorod not only exhibits excellent adsorption performance for gas molecules but also behaves as an ideal support for the immobilization of perovskite particles, leading to enhanced charge separation and visible light absorption facilitated by the formation of Z-scheme heterostructure of N-CQDs/PrFeO3, as revealed by the photoluminescence spectra and Mott–Schottky characterizations. The influence of the mass fraction of N-CQDs relative to PrFeO3 (from 1 to 9 wt %) on the NO x conversion and N2 selectivity was investigated under visible light irradiation. The 5 wt % N-CQDs/PrFeO3/Pal is found to display the highest efficiency of 93% and 100% N2 selectivity favored by abundant acid sites and excellent reducibility, as indicated in NH3-TPD and H2-TPR measurements. Additionally, the tolerance to SO2 and H2O shows no obvious deactivation due to the fact that N-CQDs and Pal can benefit the adsorption of SO2 and H2O and prevent NH3 from being sulfated by SO2 and the catalyst from being eroded by H2O, respectively.

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“…(a)UV–vis spectra of CQDs, N-CQDs, PrFeO 3 /Pal, and N-CQDs/PrFeO 3 . (b) Evaluation of band gap with (A h ν) versus h ν.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Shi

Yan

et al. 2018

ACS Sustainable Chem. Eng.

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“…Nitrogen oxides (NO and NO 2 ), as a major gas pollutant, will cause acid rain, smog, and other secondary pollutants. A number of technologies have been developed to control NO emissions, such as selective non-catalytic reduction, , selective catalytic reduction (SCR), − wet scrubbing, absorption, , and so on. ,− Nowadays, NH 3 -SCR is widely used as the commercial technology to remove NO x in stationary and mobile sources. ,− The commercial catalyst used in NH 3 -SCR system is V 2 O 5 /TiO 2 -based catalyst, such as V 2 O 5 –WO 3 /TiO 2 and V 2 O 5 –MoO 3 /TiO. Current vanadium-based catalysts exhibit high deNO x activity at the temperatures above 300 °C, but their activity will rapidly drop with decreasing temperature.…”

Section: Introductionmentioning

confidence: 99%

Partial Oxidation of NO by H₂O₂ and afterward Reduction by NH₃-Selective Catalytic Reduction: An Efficient Method for NO Removal

Xue

Rac

et al. 2020

Ind. Eng. Chem. Res.

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A system for NO removal from flue gas comprising partial oxidation by H 2 O 2 and selective catalytic reduction (SCR) process is proposed in this study. This hybrid system is found to be extremely efficient for deNO x at 200−290 °C. In this system, H 2 O 2 partially oxidizes the NO molecules to NO 2 . The NO/NO 2 mixture reacts fast with NH 3 on the surface of a V 2 O 5 −WO 3 /TiO 2 catalyst. The reaction kinetics was studied by varying reaction temperatures and the H 2 O 2 /NO molar ratio. A V 2 O 5 −WO 3 /TiO 2 SCR catalyst was also filled in the oxidation reactor, but it hardly changes the oxidation rate. The downstream SCR reaction was found to be significantly upgraded by the preoxidation process, which elevates the NO x reduction rate from 20% (without preoxidation) to more than 60% (with preoxidation).

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“…The NOx itself is not only harmful to the human body but also causes various environmental problems, such as acid rain, global warming, and smog. The NOx is highly mobile as it is readily carried over long distances by the wind, causing worldwide problems [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Recent trends in vanadium-based SCR catalysts for NOx reduction in industrial applications: stationary sources

Jeong

Lee

et al. 2022

Nano Convergence

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Vanadium-based catalysts have been used for several decades in ammonia-based selective catalytic reduction (NH3-SCR) processes for reducing NOx emissions from various stationary sources (power plants, chemical plants, incinerators, steel mills, etc.) and mobile sources (large ships, automobiles, etc.). Vanadium-based catalysts containing various vanadium species have a high NOx reduction efficiency at temperatures of 350–400 °C, even if the vanadium species are added in small amounts. However, the strengthening of NOx emission regulations has necessitated the development of catalysts with higher NOx reduction efficiencies. Furthermore, there are several different requirements for the catalysts depending on the target industry and application. In general, the composition of SCR catalyst is determined by the components of the fuel and flue gas for a particular application. It is necessary to optimize the catalyst with regard to the reaction temperature, thermal and chemical durability, shape, and other relevant factors. This review comprehensively analyzes the properties that are required for SCR catalysts in different industries and the development strategies of high-performance and low-temperature vanadium-based catalysts. To analyze the recent research trends, the catalysts employed in power plants, incinerators, as well as cement and steel industries, that emit the highest amount of nitrogen oxides, are presented in detail along with their limitations. The recent developments in catalyst composition, structure, dispersion, and side reaction suppression technology to develop a high-efficiency catalyst are also summarized. As the composition of the vanadium-based catalyst depends mostly on the usage in stationary sources, various promoters and supports that improve the catalyst activity and suppress side reactions, along with the studies on the oxidation state of vanadium, are presented. Furthermore, the research trends related to the nano-dispersion of catalytically active materials using various supports, and controlling the side reactions using the structure of shaped catalysts are summarized. The review concludes with a discussion of the development direction and future prospects for high-efficiency SCR catalysts in different industrial fields.

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NOx abatement from stationary emission sources by photo-assisted SCR: Lab-scale to pilot-scale studies

Cited by 22 publications

References 34 publications

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Partial Oxidation of NO by H₂O₂ and afterward Reduction by NH₃-Selective Catalytic Reduction: An Efficient Method for NO Removal

Recent trends in vanadium-based SCR catalysts for NOx reduction in industrial applications: stationary sources

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NOx abatement from stationary emission sources by photo-assisted SCR: Lab-scale to pilot-scale studies

Cited by 22 publications

References 34 publications

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO3 for Photo-SCR Removal of NOx

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO3 for Photo-SCR Removal of NOx

Partial Oxidation of NO by H2O2 and afterward Reduction by NH3-Selective Catalytic Reduction: An Efficient Method for NO Removal

Recent trends in vanadium-based SCR catalysts for NOx reduction in industrial applications: stationary sources

Contact Info

Product

Resources

About

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Partial Oxidation of NO by H₂O₂ and afterward Reduction by NH₃-Selective Catalytic Reduction: An Efficient Method for NO Removal