Synergistic effect of V2O5-WO3/TiO2 and H-ZSM-5 catalysts prepared by physical mixing on the selective catalytic reduction of NOx with NH3

Kang, Tae Hun; Kim, Hyun Sub; Lee, Hwangho; Kim, Do Heui

doi:10.1016/j.apsusc.2022.156159

Cited by 12 publications

(4 citation statements)

References 45 publications

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“…For the P/Z-S catalyst, the band at 3649 cm –1 was attributed to hydroxyl groups. The bands at 3333, 1607, 1196, and 1180 cm –1 were assigned to coordination NH 3 at the Lewis acid site while the bands at 1475 and 1420 cm –1 were attributed to NH 4 + at the Brønsted acid site. ,,, N 2 O 4 (1725 cm –1 ), bidentate nitrates (1530 cm –1 ), and –NH 2 (1338 cm –1 ) were also observed. , It indicated that the P/Z-S catalyst followed the i-SCR reaction mechanism in NH 3 –SCO reactions. By comparing the infrared profiles of P/Z and P/Z-S catalysts, it was concluded that sulfuric acid treatment of the ZrO 2 support could increase the number of acid sites on the surface of the P/Z-S catalyst, especially Brønsted acid sites.…”

Section: Resultsmentioning

confidence: 87%

“…The bands at 3333, 1607, 1196, and 1180 cm −1 were assigned to coordination NH 3 at the Lewis acid site while the bands at 1475 and 1420 cm −1 were attributed to NH 4 + at the Brønsted acid site. 13,61,80,81 N 2 O 4 (1725 cm −1 ), bidentate nitrates (1530 cm −1 ), and −NH 2 (1338 cm −1 ) were also observed. 71,77 It indicated that the P/Z-S catalyst followed the i-SCR reaction mechanism in NH 3 −SCO reactions.…”

Section: Interaction Between Nh 3 and Omentioning

confidence: 90%

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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: 87%

Section: Interaction Between Nh 3 and Omentioning

confidence: 90%

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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“…Except for these zeolite catalysts, scholars tried to combine metal-based catalysts (V 2 O 5 -WO 3 /TiO 2 ) with zeolite catalysts (H-ZSM-5) to prepare the composite catalyst PM. The PM catalyst exhibited higher catalytic activity than the V 2 O 5 WO 3 /TiO 2 catalyst because the PM catalyst adsorbed more NO 2 and N 2 O 4 [49]. Given the complexity of the exhaust purification system in SCR, some researchers adopted an H 2 selective catalytic reduction method using Pt/KFI molecular sieve catalysts from 150 • C to 250 • C, and the conversion rate of NO x reached 80% [50].…”

Section: Selective Catalytic Reduction (Scr) Of No Xmentioning

confidence: 99%

Research and Application Development of Catalytic Redox Technology for Zeolite-Based Catalysts

Zhang,

Fang,

Huang

et al. 2023

Catalysts

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Zeolites are porous materials with plentiful and adjustable pore structures, which are widely applied in various fields such as fossil fuel energy conversion, preparation of clean energy, chemical product conversion, CO2 capture, VOC treatment, and so on. Zeolites exhibited advantageous adsorption compared with traditional adsorbents such as activated carbon; in addition, they can also provide abundant reaction sites for various molecules. The chemical composition, structural acidity, and distribution of pore size can distinctly affect the efficiency of the reaction. The modification of zeolite structure, the development of novel and efficient preparation methods, as well as the improvement of reaction efficiency, have always been the focus of research for zeolites.

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“…3,4 Among them, the selective catalytic reduction (SCR) of NO with NH 3 as the reductant is nowadays well-established as the most effective technique to eliminate NOx. 5,6 However, typical commercial SCR technologies suffer from disadvantages such as high operating temperature (300-400 °C) of catalysts (V 2 O 5 -WO 3 /TiO 2 ) 7,8 and secondary pollution caused by ammonia slip. 9 In contrast, the direct catalytic decomposition of NO is deemed the most ideal technology given that no reductant is needed and no harmful products are formed.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature direct decomposition of NO over Rh/NC-MnFe catalyst: activity, stability and mechanism

Tan,

Qi,

Cheng

et al. 2024

Catal. Sci. Technol.

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Synergistic effect of V2O5-WO3/TiO2 and H-ZSM-5 catalysts prepared by physical mixing on the selective catalytic reduction of NOx with NH3

Cited by 12 publications

References 45 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

Research and Application Development of Catalytic Redox Technology for Zeolite-Based Catalysts

Low-temperature direct decomposition of NO over Rh/NC-MnFe catalyst: activity, stability and mechanism

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Synergistic effect of V2O5-WO3/TiO2 and H-ZSM-5 catalysts prepared by physical mixing on the selective catalytic reduction of NOx with NH3

Cited by 12 publications

References 45 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

Research and Application Development of Catalytic Redox Technology for Zeolite-Based Catalysts

Low-temperature direct decomposition of NO over Rh/NC-MnFe catalyst: activity, stability and mechanism

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Product

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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