Effects of SO2 on the low temperature selective catalytic reduction of NO by NH3 over CeO2-V2O5-WO3/TiO2 catalysts

Qiang, Liang; Li, Jian; He, Hong; Liang, Wenjun; Zhang, Tiejun; Fan, Xing

doi:10.1007/s11783-017-0926-6

Cited by 13 publications

(5 citation statements)

References 23 publications

(23 reference statements)

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“…+ [33,51] were observed in the spectra of the used catalysts. In both cases, the catalysts used at 200°C exhibited peaks at 975, 1042, and 1136 cm À 1 with a shoulder peak at 1220 cm À 1 .…”

Section: Ft-ir Analysis Of Accumulated Sulfur Compoundsmentioning

confidence: 95%

Deactivation Mechanism and Enhanced Durability of V₂O₅/TiO₂–SiO₂–MoO₃ Catalysts for NH₃−SCR in the Presence of SO₂

et al. 2020

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V 2 O 5 /TiO 2-type catalysts are widely applied for selective catalytic NO reduction by NH 3 (NH 3-SCR), but enhanced sulfur tolerance and low-temperature activity are required. Herein, V 2 O 5 / TiO 2 À SiO 2 À MoO 3 (V/TSM) was demonstrated to have excellent catalytic activity and durability for NH 3-SCR in the presence of SO 2 at temperatures lower than 200°C. The deactivation mechanism and factors influencing SO 2 durability were investigated using catalytic durability tests, Fourier-transform infrared spectroscopy, and temperature-programmed desorption/ decomposition. Our results revealed that (NH 4) 2 S 2 O 3 and NH 4 HSO 4 form on catalyst surfaces by NH 3 À SO 2 À H 2 O reactions at low temperatures, resulting in catalyst deactivation via pore blockage. However, V/TSM was found to possess an increased number of active sites for decomposing deposited ammonium sulfate salts. The decomposition activity was related to the solid acidity, which enhanced SO 2 desorption and reactions between ammonium sulfate salts and NO. These findings will contribute to the development of catalysts with improved lifetimes for NH 3 À SCR.

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Section: Ft-ir Analysis Of Accumulated Sulfur Compoundsmentioning

confidence: 95%

Deactivation Mechanism and Enhanced Durability of V₂O₅/TiO₂–SiO₂–MoO₃ Catalysts for NH₃−SCR in the Presence of SO₂

et al. 2020

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“…The specific role of ceria on the sulfur resistance of V 2 O 5 -WO 3 /TiO 2 catalysts was investigated by Liang et al [205]. Ceria helps to improve DeNO x activity and sulfur resistance.…”

Section: Cerium-promoted Wo 3 Catalysts For Nh 3 -Scrmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).

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“…In consideration of the simple and convenient principles, the one-step method is more appropriate. 109 In addition, pre-sulfurizing cerium-based catalysts can be regarded as a different preparation approach. 69,99,110 After presulfating the cerium-based catalyst samples, the newly formed Brønsted acid sites would facilitate the NH 3 -SCR activity and SO 2 resistance.…”

Section: Improvements In So 2 Tolerance Of Cerium-based Catalysts For Selective Catalytic Reduction With Nhmentioning

confidence: 99%

Recent advances and perspectives in the resistance of SO₂ and H₂O of cerium-based catalysts for NO_x selective catalytic reduction with ammonia

Zhang

Zou

et al. 2022

New J. Chem.

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Effects of SO2 on the low temperature selective catalytic reduction of NO by NH3 over CeO2-V2O5-WO3/TiO2 catalysts

Cited by 13 publications

References 23 publications

Deactivation Mechanism and Enhanced Durability of V₂O₅/TiO₂–SiO₂–MoO₃ Catalysts for NH₃−SCR in the Presence of SO₂

Deactivation Mechanism and Enhanced Durability of V₂O₅/TiO₂–SiO₂–MoO₃ Catalysts for NH₃−SCR in the Presence of SO₂

Tungsten-Based Catalysts for Environmental Applications

Recent advances and perspectives in the resistance of SO₂ and H₂O of cerium-based catalysts for NO_x selective catalytic reduction with ammonia

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Effects of SO2 on the low temperature selective catalytic reduction of NO by NH3 over CeO2-V2O5-WO3/TiO2 catalysts

Cited by 13 publications

References 23 publications

Deactivation Mechanism and Enhanced Durability of V2O5/TiO2–SiO2–MoO3 Catalysts for NH3−SCR in the Presence of SO2

Deactivation Mechanism and Enhanced Durability of V2O5/TiO2–SiO2–MoO3 Catalysts for NH3−SCR in the Presence of SO2

Tungsten-Based Catalysts for Environmental Applications

Recent advances and perspectives in the resistance of SO2 and H2O of cerium-based catalysts for NOx selective catalytic reduction with ammonia

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Product

Resources

About

Deactivation Mechanism and Enhanced Durability of V₂O₅/TiO₂–SiO₂–MoO₃ Catalysts for NH₃−SCR in the Presence of SO₂

Deactivation Mechanism and Enhanced Durability of V₂O₅/TiO₂–SiO₂–MoO₃ Catalysts for NH₃−SCR in the Presence of SO₂

Recent advances and perspectives in the resistance of SO₂ and H₂O of cerium-based catalysts for NO_x selective catalytic reduction with ammonia