Insight into the enhancing activity and stability of Ce modified V2O5/AC during cyclic desulfurization-regeneration-denitrification

Li, Qiaoyan; Liang, Meisheng; Han, Xiaojin; Hou, Yaqin; Huang, Zhanggen

doi:10.1016/j.jhazmat.2021.127397

Cited by 11 publications

(17 citation statements)

References 46 publications

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“…It is widely accepted that the SCR reaction occurs at the surface VO x sites over the V-based catalysts. − The adsorption and activation of ammonia species occur on the V 5+ O x sites, then the activated NH x species can react with NO to yield N 2 and H 2 O, and the reduced V 4+ O x sites are generated, which can be reoxidized by O 2 . To further investigate the change of surface VO x sites during the SCR process, an in situ UV–vis experiment was conducted over VTi–Cd (Figure a) and VTi–Cd&As (Figure b) at 250 °C.…”

Section: Resultsmentioning

confidence: 99%

Extraordinary Detoxification Effect of Arsenic on the Cadmium-Poisoned V₂O₅/TiO₂ Catalyst for Selective Catalytic Reduction of NO_x by NH₃

Jiang

Yin

et al. 2023

ACS EST Eng.

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Arsenic has been found as a serious toxicant for the catalysts in the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR). However, the detoxification effect of arsenic on the cadmium-poisoned V 2 O 5 /TiO 2 catalyst was found in this work. With an arsenic loading of 1.8 wt %, the NO x conversion over cadmium-poisoned V 2 O 5 /TiO 2 increased from 45.1 to 88.3% at 350 °C under a GHSV of 300,000 h −1 . Meantime, the adverse effect on N 2 selectivity caused by arsenic was reduced. The catalyst characterization manifests that the surface VO xactive sites were liberated from the restriction of cadmium due to the interaction between cadmium and arsenic. More importantly, it was found that the SCR performance of the catalysts was highly dependent on the surface VO x sites. In situ experiments proved that the released surface VO x species could not only provide the Lewis sites for the NH 3 adsorption but also dominate the redox cycle (V 5+ ↔ V 4+ ) during the NH 3 -SCR process. We believe that this study can inspire directions for the design of NH 3 -SCR catalysts with superior resistance to different poisons. KEYWORDS: NH 3 -SCR, V 2 O 5 /TiO 2 , cadmium and arsenic, VO x sites, redox cycle

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Section: Resultsmentioning

confidence: 99%

Extraordinary Detoxification Effect of Arsenic on the Cadmium-Poisoned V₂O₅/TiO₂ Catalyst for Selective Catalytic Reduction of NO_x by NH₃

Jiang

Yin

et al. 2023

ACS EST Eng.

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“…In the past few years, carbon-based catalysts for NH 3 -SCR reactions have been studied by many researchers due to their high surface area, porosity, and good support properties, 6 such as activated carbon (AC), [7][8][9] activated carbon fiber (ACF), 10 CNT catalysts 11 and so on. Among them, activated carbon supported vanadium oxide (V 2 O 5 @AC) catalysts possess high catalytic performance for the NH 3 -SCR reaction at low temperatures (180-250 °C).…”

Section: Introductionmentioning

confidence: 99%

Unveiling the role of microwave induction on V₂O₅@AC catalysts with enhanced activity for low temperature NH₃-SCR reaction: an experimental and DFT study

cheng

Song

et al. 2023

Environ. Sci.: Nano

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“…Currently, SCR technology with carbon catalysts has been applied to steel sintering through a reaction–regeneration process which consists of a catalytic reactor along with a regenerator. ,, In general, both NO x reduction and SO 2 adsorption occur over carbon catalysts in the catalytic reactor, followed by recycling sulfur from the used carbon catalysts in the regenerator. The regeneration process, in which the used carbon catalysts are thermally treated under N 2 , is critical for preserving long-term operations and decreasing operation costs.…”

Section: Introductionmentioning

confidence: 99%

Potential Risk of NH₃ Slip Arisen from Catalytic Inactive Site in Selective Catalytic Reduction of NO_x with Metal-Free Carbon Catalysts

Yuan

Wang

et al. 2022

Environ. Sci. Technol.

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Ammonia emissions from industrial processes have rapidly increased in the past years. Recent advances have used carbon-based selective catalytic reduction (SCR) technology combined with a reaction−regeneration process to reduce NO x from sintering flue gas, while NH 3 slip is seldom accounted for in this process. This study demonstrates that although the electrophilic carboxyl groups (−COOH) on metal-free carbon catalysts exhibit strong adsorption toward NH 3 , they do not participate in the SCR reaction. As a result of the competitive adsorption of NH 3 in the reaction step, these catalytic inactive carboxyl groups not only prolong the time to the SCR steady state, but also result in the potential risk of NH 3 slip. A linear relationship with the equimolar ratio between carboxyl groups and slipped NH 3 was established in the regeneration steps. The slip of NH 3 could be alleviated by the decomposition of carboxyl groups, and special attention should be paid to the presence of inactive sites with strong NH 3 adsorption on industrial-employed carbon catalysts. In addition to advancing the understanding of the NH 3 −SCR mechanism, this work also provides valuable opportunities for the control of ammonia emissions from industrial processes.

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Insight into the enhancing activity and stability of Ce modified V2O5/AC during cyclic desulfurization-regeneration-denitrification

Cited by 11 publications

References 46 publications

Extraordinary Detoxification Effect of Arsenic on the Cadmium-Poisoned V₂O₅/TiO₂ Catalyst for Selective Catalytic Reduction of NO_x by NH₃

Extraordinary Detoxification Effect of Arsenic on the Cadmium-Poisoned V₂O₅/TiO₂ Catalyst for Selective Catalytic Reduction of NO_x by NH₃

Unveiling the role of microwave induction on V₂O₅@AC catalysts with enhanced activity for low temperature NH₃-SCR reaction: an experimental and DFT study

Potential Risk of NH₃ Slip Arisen from Catalytic Inactive Site in Selective Catalytic Reduction of NO_x with Metal-Free Carbon Catalysts

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Insight into the enhancing activity and stability of Ce modified V2O5/AC during cyclic desulfurization-regeneration-denitrification

Cited by 11 publications

References 46 publications

Extraordinary Detoxification Effect of Arsenic on the Cadmium-Poisoned V2O5/TiO2 Catalyst for Selective Catalytic Reduction of NOx by NH3

Extraordinary Detoxification Effect of Arsenic on the Cadmium-Poisoned V2O5/TiO2 Catalyst for Selective Catalytic Reduction of NOx by NH3

Unveiling the role of microwave induction on V2O5@AC catalysts with enhanced activity for low temperature NH3-SCR reaction: an experimental and DFT study

Potential Risk of NH3 Slip Arisen from Catalytic Inactive Site in Selective Catalytic Reduction of NOx with Metal-Free Carbon Catalysts

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Extraordinary Detoxification Effect of Arsenic on the Cadmium-Poisoned V₂O₅/TiO₂ Catalyst for Selective Catalytic Reduction of NO_x by NH₃

Extraordinary Detoxification Effect of Arsenic on the Cadmium-Poisoned V₂O₅/TiO₂ Catalyst for Selective Catalytic Reduction of NO_x by NH₃

Unveiling the role of microwave induction on V₂O₅@AC catalysts with enhanced activity for low temperature NH₃-SCR reaction: an experimental and DFT study

Potential Risk of NH₃ Slip Arisen from Catalytic Inactive Site in Selective Catalytic Reduction of NO_x with Metal-Free Carbon Catalysts