A novel bifunctional Pt/Ce/WZrO  catalyst for efficient selective oxidation of high-concentration NH3

Cheng, Shaosi; Han, Zhitao; Zhao, Hongzhe; Li, Yeshan; Lu, Shijian

doi:10.1016/j.cej.2023.147876

Cited by 13 publications

(2 citation statements)

References 63 publications

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“…As shown in Table , the introduction of Ce species to the P/Z catalyst significantly increased the proportion of Pt 2+ /(Pt 2+ + Pt 4+ ), indicating that the presence of CeO 2 favors the formation of more Pt 2+ species. Moreover, the electron transfer between Pt 2+ /Pt 4+ and Ce 3+ /Ce 4+ cycles facilitated the creation of more oxygen defects on the catalyst surface, which was mainly attributed to the transfer of lattice oxygen and charge imbalance induced by electron transfer during the formation of Pt–O–Ce, suggesting that the introduction of Ce could form a strong interaction with Pt species, where sulfuric acid treatment of ZrO 2 support obviously reduced the ratio, which might be attributed to the polarization of Pt atoms near SO 4 2– , resulting in more positively charged Pt atoms. , It suggested that the introduced S species interacted with the Pt species. Figure (B) shows the Ce 3d profile of P/C/Z and P/C/Z-S catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…The modified catalysts exhibited a stronger NH 3 adsorption capacity, which helped to suppress NH 3 overoxidation, thus improving N 2 selectivity. Cheng et al adopted the impregnation-precipitation method to synthesize Pt/Ce/WZrO x bifunctional catalysts, which exhibited 96.4% NH 3 conversion and 94.2% N 2 selectivity at 310 °C. It was ascribed to a strong interaction between Pt and Ce species.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Pt/Ce/ZrO₂–S Bifunctional Catalyst for Ammonia Removal via Tuning Acidic and Redox Sites

Tian,

Han,

Zeng

et al. 2024

Energy Fuels

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Ammonia selective catalytic oxidation (NH 3 −SCO) is currently the most effective method for removing NH 3 . However, existing noble-metal catalysts still suffer from poor N 2 selectivity in NH 3 −SCO reactions. Based on Pt/ZrO 2 (P/Z), ZrO 2 support was first treated with sulfuric acid, and then Ce species were introduced to prepare Pt/Ce/ZrO 2 −S (P/C/Z-S) bifunctional catalyst. The catalytic test result showed that the P/C/Z-S catalyst possessed excellent NH 3 removal performance with a T 90 temperature of 273 °C, which was lower by 22 °C than the P/Z catalyst. The introduction of Ce species led to a significant shift of the reduction peak toward low temperatures, which greatly improved the low-temperature redox capability of the catalyst. Notably, the P/C/Z-S catalyst exhibited a much better N 2 selectivity (>90%) in a wide temperature range (320−450 °C). The introduction of S species significantly enhanced the number of acid sites (especially Brønsted acid sites) at the catalyst surface. It promoted the NH 3 adsorption capacity of the P/C/Z-S catalyst obviously. On the other hand, the introduced Ce species provided more redox active sites, which would accelerate the activation and reaction of adsorbed NH 3 species. The sulfuric acid treatment of the ZrO 2 support and the introduction of Ce species resulted in abundant adsorbed oxygen at the catalyst surface. It was beneficial to dihydrogen adsorbed NH 3 to amide (−NH 2 ) species, which subsequently underwent ammonia selective catalytic reduction (NH 3 −SCR) reactions with NO over Ce sites. This study can enrich the insights into the design of efficient NH 3 −SCO catalysts by tuning acidic and redox active sites.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Pt/Ce/ZrO₂–S Bifunctional Catalyst for Ammonia Removal via Tuning Acidic and Redox Sites

Tian,

Han,

Zeng

et al. 2024

Energy Fuels

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Catalytic Advancements in NH₃ Selective Catalytic Oxidation: The Impact of Cu‐Induced Lattice Distortion in TiO₂ Crystal Structure

Liu,

Long,

et al. 2024

Chemistry An Asian Journal

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A series of xCu ‐TiO2 obtained from the sol‐gel method were tested for NH3 selective catalytic oxidation (NH3‐SCO). Its performance was higher than that of supported Cu/TiO2‐Im and solvent‐free Cu/TiO2‐SF. The catalyst exhibits better water resistance at 300 ℃. XRD, Raman, and H2‐TPR proved that the crystal lattice of TiO2 was deformed by Cu doping, which increased the specific surface area of the catalyst. The dispersion of the Cu component is further enhanced. The enhancement of redox potential was the key to improving catalytic activity. The NH3‐TPD results prove that more acidic sites promote more active NH3 species being adsorbed and dissociated on the catalyst surface. The in‐situ DRIFTs results certify that the NH3 species adsorbed on the Lewis acid sites were easier to consume than those on the Brønsted acid sites. The DFT theoretical calculation demonstrates that the doped Cu promotes the TiO2 conduction band to move closer to the Fermi level and enhances the redox performance of the catalyst. The results suggest that the Cu‐TiO2 catalyst was a potential catalyst under actual working conditions, which would provide a technological reserve for the development and diffusion of ammonia slip for both mobile and fixed sources.

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Promotional Catalytic Activity of Bifunctional Ru-Ce-Zr Catalysts forNH3-SCO by Deposition Order of Dual Active Components

Jiang

2024

Catal Lett

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A novel bifunctional Pt/Ce/WZrO catalyst for efficient selective oxidation of high-concentration NH3

Cited by 13 publications

References 63 publications

Synthesis of Pt/Ce/ZrO₂–S Bifunctional Catalyst for Ammonia Removal via Tuning Acidic and Redox Sites

Synthesis of Pt/Ce/ZrO₂–S Bifunctional Catalyst for Ammonia Removal via Tuning Acidic and Redox Sites

Catalytic Advancements in NH₃ Selective Catalytic Oxidation: The Impact of Cu‐Induced Lattice Distortion in TiO₂ Crystal Structure

Promotional Catalytic Activity of Bifunctional Ru-Ce-Zr Catalysts forNH3-SCO by Deposition Order of Dual Active Components

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A novel bifunctional Pt/Ce/WZrO catalyst for efficient selective oxidation of high-concentration NH3

Cited by 13 publications

References 63 publications

Synthesis of Pt/Ce/ZrO2–S Bifunctional Catalyst for Ammonia Removal via Tuning Acidic and Redox Sites

Synthesis of Pt/Ce/ZrO2–S Bifunctional Catalyst for Ammonia Removal via Tuning Acidic and Redox Sites

Catalytic Advancements in NH3 Selective Catalytic Oxidation: The Impact of Cu‐Induced Lattice Distortion in TiO2 Crystal Structure

Promotional Catalytic Activity of Bifunctional Ru-Ce-Zr Catalysts forNH3-SCO by Deposition Order of Dual Active Components

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Product

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About

Synthesis of Pt/Ce/ZrO₂–S Bifunctional Catalyst for Ammonia Removal via Tuning Acidic and Redox Sites

Synthesis of Pt/Ce/ZrO₂–S Bifunctional Catalyst for Ammonia Removal via Tuning Acidic and Redox Sites

Catalytic Advancements in NH₃ Selective Catalytic Oxidation: The Impact of Cu‐Induced Lattice Distortion in TiO₂ Crystal Structure