Promotional effect of surface treated N-TiO2 as support for VOx-based catalysts on the selective catalytic reduction of NO using NH3

Ye, Bora; Lee, Myeung-jin; Chun, Seung-Yeop; Lee, Geumyeon; Kim, Jin-Woo; Jeong, Bora; Kim, Tae-Wook; Kim, Hong-Dae

doi:10.1016/j.apsusc.2021.149934

Cited by 11 publications

(2 citation statements)

References 24 publications

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“…In addition to graphene, studies related to a catalyst containing vanadium and tungsten active materials dispersed using an oxygenated carbon nanotube (O-CNT) support on which an oxygen group is formed through surface acid treatment and having dispersibility and thermal stability of a TiO 2 support with nitrogen functional group were conducted [ 88 , 96 ]. In addition, a study was conducted using hexagonal boron nitride, which has a high melting point of 3000 °C and excellent thermal stability, as a support synthesized h-BN with a porous structure on the surface due to catalytic etching by the transition metal.…”

Section: Dispersion Of Active Catalytic Materialsmentioning

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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Section: Dispersion Of Active Catalytic Materialsmentioning

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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“…According to Ye et al, when the dispersibility of the active material is low, the activity decreases due to aggregation and crystallization as the catalyst active species increases. 13 In their study, they used N-doped TiO 2 to improve dispersion, and reported an increase in both the dispersion and catalytic activity of the catalyst material. Zhang et al improved the dispersibility of active species Cu and Ce by ultrasonic-assisted impregnation method during the preparation of CuCe/TiO 2 -ZrO 2 catalyst, and reported that NO conversion was significantly increased.…”

Section: Introductionmentioning

confidence: 99%

The effect of dispersant characteristics on the De-NOx efficiency of SCR catalyst

Jung

Cha

Lim

et al. 2022

Energy & Environment

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In this study, we analyzed the effect of dispersant characteristics on the selective catalytic reduction (SCR) catalyst properties and de-NOx efficiency. For this, we measured the zeta potential and pH value of each dispersant, and compared the thermal properties of the dispersant through TG-DTA analysis. Also, the Py-GC/MS analysis results and the MSDS contents of the product were used to compare the components and molecular weight types of the dispersant. As a result, the higher the zeta potential, pH, and molecular weight of the dispersant, the more improved the dispersibility of the TiO2 slurry. Characteristics such as the rheology, sedimentation, and pH change, were studied to compare the dispersibility of the catalyst slurries, and the dispersion characteristics of the TiO2 slurries were confirmed by TEM. The SCR catalysts prepared varied based on the dispersant added, with the varying factor being the de-NOx efficiency between (250 to 450) °C depending on the dispersibility. The dispersant with the excellent dispersibility gave the highest efficiency of 84% or more at 250°C and 300°C, and the highest de-NOx efficiency of more than 92% at 350°C and 400°C.

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V2O5-WO3 catalysts treated with titanium isopropoxide using a one-step co-precipitation method for selective catalytic reduction with NH3

Lee

Kim

et al. 2023

Catalysis Today

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Promotional effect of surface treated N-TiO2 as support for VOx-based catalysts on the selective catalytic reduction of NO using NH3

Cited by 11 publications

References 24 publications

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

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

The effect of dispersant characteristics on the De-NOx efficiency of SCR catalyst

V2O5-WO3 catalysts treated with titanium isopropoxide using a one-step co-precipitation method for selective catalytic reduction with NH3

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