The roles of Brønsted acidity in low-temperature catalytic oxidation of NO over acidic zeolites with H2O2

Cui, Rongji; Ma, Suxia; Yang, Bingchuan; Li, Shicheng; Li, Jing; Pei, Ting; Wang, Jie; Sun, Shujun; Mi, Chenfeng

doi:10.1016/j.chemosphere.2020.126561

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…The absorption bands at around 1420 and 1400 cm –1 belonged to nitrate species. , The absorption bands at around 1630 cm –1 were attributed to the O–H bending vibration of adsorbed water. The absorption bands at 3000–3600 cm –1 were caused by the stretching vibration of typical hydroxyl groups . The absorption bands of sulfates and sulfites were detected on the surface of spent catalysts, where the absorption bands at 590–600 cm –1 were assigned to the bending vibration of the SO 2 molecule and the absorption bands at around 980 cm –1 were ascribed to the stretching motion of sulfites.…”

Section: Resultsmentioning

confidence: 98%

“…The absorption bands at 3000−3600 cm −1 were caused by the stretching vibration of typical hydroxyl groups. 37 The absorption bands of sulfates and sulfites were detected on the surface of spent catalysts, where the absorption bands at 590− 600 cm −1 were assigned to the bending vibration of the SO 2 molecule and the absorption bands at around 980 cm −1 were ascribed to the stretching motion of sulfites. In addition, the absorption bands at 1140 and 1240 cm −1 were assigned to the stretching motion of sulfates.…”

Section: Resultsmentioning

confidence: 99%

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Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Jia

Xiong

et al. 2021

Ind. Eng. Chem. Res.

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1% Cu−1% Fe/TiO 2 was selected as the optimal catalyst for simultaneous removal of NO and SO 2 with vaporized H 2 O 2 . The effects of temperature, the molar ratio of H 2 O 2 and NO, gas hourly space velocity (GHSV), and SO 2 concentration on simultaneous removal efficiency were investigated. Besides, a 24 h stability test was conducted on the 1% Cu−1% Fe/TiO 2 and 2% Fe/ TiO 2 . The results showed that the excellent removal efficiency of 93.9% for NO x and 100% for SO 2 was obtained under the optimal conditions. Moreover, 1% Cu−1% Fe/TiO 2 presented excellent sulfurresistant stability. Furthermore, the fresh and spent catalysts were characterized by SO 2 -TPD, XRD, EPR, TEM, EDS, XPS, and FTIR. It was found that the generation of sulfate species on the catalysts would lead to the decrease of surface oxygen vacancies, resulting in the reduction of NO x removal. Additionally, the mechanism of Cu doping on catalytic performance was discussed. The introduction of Cu could improve the activity of the catalyst by the increase of surface oxygen vacancies and inhibit the formation of sulfates to improve the sulfur resistance of catalysts.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Jia

Xiong

et al. 2021

Ind. Eng. Chem. Res.

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“…The filtered cake was dried at 100 °C overnight and calcined at 550 °C for 5 h at a heating rate of 10 °C min –1 to remove the organic template. Finally, 1 mol/L NH 4 Cl solution was used for ion exchange at 80 °C for 2 h to convert the Na-type molecular sieve to H-type because the Na-type molecular sieve contains no B acid, while the H-type molecular sieve contains B acid, and B acid plays an important role in the catalytic process . The sample was eventually washed and dried to obtain the fly ash-based ZSM-5 powder.…”

Section: Experimental Sectionmentioning

confidence: 99%

Study on the Mechanism of Catalytic Oxidation of NO with H₂O₂ Based on Fly-Ash-Derived Fe/ZSM-5 Catalysts

Cui

et al. 2022

Energy Fuels

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Solid waste fly ash can encroach on land, contaminate the environment, and jeopardize human health. An alkali fusion method combined with a hydrothermal method was adopted to prepare fly ash-derived ZSM-5 molecular sieves, and a series of Fe/ZSM-5 catalysts were also prepared to test their catalytic performance in NO oxidation with H2O2. Moreover, the characteristics of catalysts synthesized by fly ash, as well as the relationship between the structure and the catalytic activity, were analyzed in detail through multiple characterization approaches. The results gave important insights into the active sites of catalytic oxidation. They concluded that 10% Fe/ZSM-5 had the best catalytic activity in which Fe sites and Brønsted acid sites collectively provided the catalytic functionality, and 92% NO removal efficiency was obtained achieved under optimal experimental conditions. This work provided a new way for recycling fly ash and developing low-cost catalysts for NO removal.

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Cerium modified copper-based mordenite zeolite catalyst for high-temperature selective catalytic reduction NO with NH3 of gas turbines

Sheng

Chen

Liu

et al. 2022

Reac Kinet Mech Cat

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The roles of Brønsted acidity in low-temperature catalytic oxidation of NO over acidic zeolites with H2O2

Cited by 10 publications

References 34 publications

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Study on the Mechanism of Catalytic Oxidation of NO with H₂O₂ Based on Fly-Ash-Derived Fe/ZSM-5 Catalysts

Cerium modified copper-based mordenite zeolite catalyst for high-temperature selective catalytic reduction NO with NH3 of gas turbines

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The roles of Brønsted acidity in low-temperature catalytic oxidation of NO over acidic zeolites with H2O2

Cited by 10 publications

References 34 publications

Investigation on Simultaneous Removal of SO2 and NO over a Cu–Fe/TiO2 Catalyst Using Vaporized H2O2: An Analysis on SO2 Effect

Investigation on Simultaneous Removal of SO2 and NO over a Cu–Fe/TiO2 Catalyst Using Vaporized H2O2: An Analysis on SO2 Effect

Study on the Mechanism of Catalytic Oxidation of NO with H2O2 Based on Fly-Ash-Derived Fe/ZSM-5 Catalysts

Cerium modified copper-based mordenite zeolite catalyst for high-temperature selective catalytic reduction NO with NH3 of gas turbines

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Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Investigation on Simultaneous Removal of SO₂ and NO over a Cu–Fe/TiO₂ Catalyst Using Vaporized H₂O₂: An Analysis on SO₂ Effect

Study on the Mechanism of Catalytic Oxidation of NO with H₂O₂ Based on Fly-Ash-Derived Fe/ZSM-5 Catalysts