Current Catalyst Technology of Selective Catalytic Reduction (SCR) for NOx Removal in South Korea

Kim, Hyo-Sik; Kasipandi, Saravanan; Kim, Jihyeon; Kang, Suk-Hwan; Kim, Jin-Ho; Ryu, Jee-Youl; Bae, Jong-Wook

doi:10.3390/catal10010052

Cited by 41 publications

(21 citation statements)

References 44 publications

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“…Current SCR processes are conducted worldwide to control both NO x and hydrocarbons (HC) pollutant emissions including the NH 3 -SCR, HC-SCR, and urea-SCR among other SCR technologies [2,[8][9][10][11][12]. Alternatively, another reaction employing SCR is the direct denitrification, 110) and (182), respectively.…”

Section: Introductionmentioning

confidence: 99%

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

et al. 2020

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Doubly promoted MeMo/Nb2O5 catalysts, in which Me = Pt, Ni, or Co oxides were prepared for the selective catalytic reduction of NOx by CO reaction (CO-SCR). Comparable chemical, textural, and structural analyses revealed similarities between NiMo and CoMo impregnated on Nb2O5, in contrast to PtMo sites, which were not homogeneously dispersed on the support surface. Both the acid function and metal dispersion gave a synergistic effect for CO-SCR at moderate temperatures. The reactivity of PtMo catalysts towards NOx and CO chemisorption was at low reaction temperatures, whereas the NOx conversion over CoMo was greatly improved at relatively high temperatures. Careful XPS, NH3-TPD, and HRTEM analyses confirmed that the large amounts of strong and moderate acid sites from PtOx entrapped on MoO3 sites induced high NOx conversions. NiMo/Nb2O5 showed poor performance in all conditions. Poisoning of the MeMo sites with water vapor or SO2 (or both) provoked the decline of the NOx conversions over NiMo and PtMo sites, whereas the structure of CoMo ones remained very active with a maximum NOx conversion of 70% at 350 °C for 24 h of reaction. This was due to the interaction of the Co3+/Co2+ and Mo6+ actives sites and the weak strength Lewis acid Nb5+ ones, as well.

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Section: Introductionmentioning

confidence: 99%

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

et al. 2020

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“…According to the flow analysis of the present application model, it is reported that the end wall effect was negligible [20]. The flow field is 2D and is not solved in the span direction.…”

Section: Computing Proceduresmentioning

confidence: 85%

“…As environmental regulations are being tightened, researchers and industrialists are seeking technologies to improve the performance of existing facilities [20]. The present study aims to improve the operating conditions of ammonia injection grids according to the inlet NO x distribution in the denitrification facilities of the SCR system in an existing large-scale coal-fired power plant using CFD tools.…”

Section: Introductionmentioning

confidence: 99%

A CFD Study on Flow Control of Ammonia Injection for Denitrification Processes of SCR Systems in Coal-Fired Power Plants

Kim

Seo²,

Chung

2021

Energies

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The selective catalytic reduction method is a useful method for the denitrification process of exhaust gas emitted from industrial facilities. The distribution of the ammonia–nitrogen oxide mixing ratio at the inlet of the catalyst layers is important in the denitrification process. In this study, a computational analysis technique was used to improve the uniformity of the NH3/NO molar ratio by controlling the flow rate of the ammonia injection nozzle according to the flow distribution of nitrogen oxides in the inlet exhaust gas of the denitrification facility. The application model was simplified to the two-dimensional array adopted from the existing selective catalytic reduction (SCR) process in the large-scaled coal-fired power plant. As the inlet conditions, four (4) types of flow pattern were simulated, i.e., parabolic, upper-skewed, lower-skewed, and random. The flow rate of the eight (8) nozzles installed in the ammonia injection grid was controlled by Design Xplorer as the optimization tool. In order to solve the two-dimensional steady, incompressible, and viscous flow fields, the commercial software named ANSYS Fluent was used with the κ-ε turbulence model. The root mean square of NH3/NO molar ratio at the inlet of the catalyst layer has been improved from 84.6% to 90.1% by controlling the flow rate of the ammonia injection nozzles. From the present numerical simulation, the operation guide could be drawn for the ammonia injection nozzles in SCR DeNOx facilities.

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“…There is world-wide increase in the regulatory control of nitrogen since the last several decades (He et al, 2018;Ji et al, 2015;. There are several methods have been introduced to deal with nitrogen pollution such as Ion Exchange (Huang et al, 2020;Leaković et al, 2000), Catalytic Reduction (Fan et al, 2020;Guan et al, 2011;Kim et al, 2020;Zhu et al, 2020), Electrodialysis (Schoeman, 2009;Vineyard et al, 2020;Zhang et al, 2020) and others (Dhamole, 2015) but research scope involves in several other suitable treatment methods, especially biological and physicochemical methods because nitrogen removal system provides a process for removing a large portion of the nitrogen concentration from wastewater effluent before it is discharged into environment.…”

Section: Introductionmentioning

confidence: 99%

A review on application of external carbon sources for denitrification for wastewater treatment

2022

Global NEST: The International Journal

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<p>With the increase in industrial and agricultural activities, huge amount of wastewater containing nitrogen is produced. Biological denitrification is currently the most widely used, sustainable and cost-effective process to remove nitrogen from wastewater. In biological denitrification, application of external carbon sources for denitrification is important because it is the way to boost the denitrification process and it is necessary for wastewater treatment plants that have to meet very stringent effluent nitrogen limits. This review study focused with treatment of wastewater using biological denitrification as advantages. This also deals with advantages of different external carbon sources with emphasis on biological denitrification as the cost of biological denitrification is controlled by the carbon source because the cost of biological denitrification is controlled by the carbon source.. Hence, use of alternative carbon sources such as agricultural wastes, and food waste is reviewed in this paper. This study recommend other waste material such as textile waste can be a part of denitrification because carbon source such as methanol, ethanol and acetic acid/acetate can be recovered from textile waste.</p>

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Current Catalyst Technology of Selective Catalytic Reduction (SCR) for NOx Removal in South Korea

Cited by 41 publications

References 44 publications

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

A CFD Study on Flow Control of Ammonia Injection for Denitrification Processes of SCR Systems in Coal-Fired Power Plants

A review on application of external carbon sources for denitrification for wastewater treatment

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