Tailoring the mechanochemical interaction between vanadium oxides and zeolite for sulfur-resistant DeNO  catalysts

Song, In Kyu; Jeon, Se Won; Lee, Hwangho; Kim, Do Heui

doi:10.1016/j.apcatb.2022.121672

Cited by 11 publications

(2 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The deposition of S species on the catalyst surface undergoes a process from physical to chemisorption. (NH 4 ) 2 SO 4 (AS) and/or NH 4 HSO 4 (ABS) are formed below 200 °C, covering the surface active site . At elevated temperatures, AS and ABS react with NO x , resulting in NH 3 species consumed and S species deposition.…”

Section: Introductionmentioning

confidence: 99%

“…(NH 4 ) 2 SO 4 (AS) and/or NH 4 HSO 4 (ABS) are formed below 200 °C, covering the surface active site. 11 At elevated temperatures, AS and ABS react with NO x , resulting in NH 3 species consumed and S species deposition. Continuous sulfation accumulates crystals to form large amounts of sulfate, resulting in reduced NH 3 −SCR performance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unlocking Mixed-Metal Oxides Active Centers via Acidity Regulation for K&SO₂ Poisoning Resistance: Self-Detoxification Mechanism of Zeolite-Confined deNO_x Catalysts

Li,

Liao

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

Selective catalytic reduction of nitrogen oxides (NO x ) with ammonia (NH3–SCR) is an efficient NO x reduction strategy, while the denitrification (deNO x ) catalysts suffer from serious deactivation due to the coexistence of multiple poisoning substances, such as alkali metal (e.g., K), SO2, etc., in industrial flue gases. It is essential to understand the interaction among various poisons and their effects on the deNO x process. Herein, the ZSM-5 zeolite-confined MnSmO x mixed (MnSmO x @ZSM-5) catalyst exhibited better deNO x performance after the poisoning of K, SO2, and/or K&SO2 than the MnSmO x and MnSmO x /ZSM-5 catalysts, the deNO x activity of which at high temperature (H-T) increased significantly (>90% NO x conversion in the range of 220–480 °C). It has been demonstrated that K would occupy both redox and acidic sites, which severely reduced the reactivity of MnSmO x /ZSM-5 catalysts. The most important, K element is preferentially deposited at −OH on the surface of ZSM-5 carrier due to the electrostatic attraction (−O–K). As for the K&SO2 poisoning catalyst, SO2 preferred to be combined with the surface-deposited K (−O–K–SO2ads) according to XPS and density functional theory (DFT) results, the poisoned active sites by K would be released. The K migration behavior was induced by SO2 over K-poisoned MnSmO x @ZSM-5 catalysts, and the balance of surface redox and acidic site was regulated, like a synergistic promoter, which led to K-poisoning buffering and activity recovery. This work contributes to the understanding of the self-detoxification interaction between alkali metals (e.g., K) and SO2 on deNO x catalysts and provides a novel strategy for the adaptive use of one poisoning substance to counter another for practical NO x reduction.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unlocking Mixed-Metal Oxides Active Centers via Acidity Regulation for K&SO₂ Poisoning Resistance: Self-Detoxification Mechanism of Zeolite-Confined deNO_x Catalysts

Li,

Liao

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Mechanochemical localization of vanadia on titania to prepare a highly sulfur-resistant catalyst for low-temperature NH3-SCR

Hwang

Park

Lee

et al. 2023

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

Prominent difference in the deactivation rate and mechanism of V2O5/TiO2 under H2S or SO2 during selective catalytic reduction of NOx with NH3

Yin

Chen

Liang

et al. 2023

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

Tailoring the mechanochemical interaction between vanadium oxides and zeolite for sulfur-resistant DeNO catalysts

Cited by 11 publications

References 47 publications

Unlocking Mixed-Metal Oxides Active Centers via Acidity Regulation for K&SO₂ Poisoning Resistance: Self-Detoxification Mechanism of Zeolite-Confined deNO_x Catalysts

Unlocking Mixed-Metal Oxides Active Centers via Acidity Regulation for K&SO₂ Poisoning Resistance: Self-Detoxification Mechanism of Zeolite-Confined deNO_x Catalysts

Mechanochemical localization of vanadia on titania to prepare a highly sulfur-resistant catalyst for low-temperature NH3-SCR

Prominent difference in the deactivation rate and mechanism of V2O5/TiO2 under H2S or SO2 during selective catalytic reduction of NOx with NH3

Contact Info

Product

Resources

About

Tailoring the mechanochemical interaction between vanadium oxides and zeolite for sulfur-resistant DeNO catalysts

Cited by 11 publications

References 47 publications

Unlocking Mixed-Metal Oxides Active Centers via Acidity Regulation for K&SO2 Poisoning Resistance: Self-Detoxification Mechanism of Zeolite-Confined deNOx Catalysts

Unlocking Mixed-Metal Oxides Active Centers via Acidity Regulation for K&SO2 Poisoning Resistance: Self-Detoxification Mechanism of Zeolite-Confined deNOx Catalysts

Mechanochemical localization of vanadia on titania to prepare a highly sulfur-resistant catalyst for low-temperature NH3-SCR

Prominent difference in the deactivation rate and mechanism of V2O5/TiO2 under H2S or SO2 during selective catalytic reduction of NOx with NH3

Contact Info

Product

Resources

About

Unlocking Mixed-Metal Oxides Active Centers via Acidity Regulation for K&SO₂ Poisoning Resistance: Self-Detoxification Mechanism of Zeolite-Confined deNO_x Catalysts

Unlocking Mixed-Metal Oxides Active Centers via Acidity Regulation for K&SO₂ Poisoning Resistance: Self-Detoxification Mechanism of Zeolite-Confined deNO_x Catalysts