Mechanistic aspects of NH3-SCR reaction over CeO2/TiO2-ZrO2-SO42− catalyst: In situ DRIFTS investigation

Fan, Jie; Ning, Ping; Song, Zhongxian; Liu, Xin; Wang, Lanying; Wang, Jing; Wang, Huimin; Long, Kaixian; Zhang, Qiulin

doi:10.1016/j.cej.2017.10.011

Cited by 153 publications

(74 citation statements)

References 53 publications

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“…This facilitated the oxidation of NO to NO 2 and consequently, increased the NH 3 -SCR performance. 48,49 Moreover, there is a shi to higher binding energies for Mn/Ti-Zr samples, which could be ascribed to the interaction between the manganese oxide and Ti-Zr support.…”

Section: 44mentioning

confidence: 99%

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

Zhang

Liu

et al. 2018

RSC Adv.

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Section: 44mentioning

confidence: 99%

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

Zhang

Liu

et al. 2018

RSC Adv.

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“…Sample blank displayed a main peak at 633 °C with a small peak at 135 °C, meanwhile, Mo possessed a main peak at 645 °C and two smaller peaks at 110, 438 °C. NH 3 ‐desoprtion peaks shifted to higher temperature for Mo sample, indicating more and stronger acid sites . This could be owing to the interaction between Mo and MnCe, which led to the increase of the metal–oxygen coordination bond length and surface acidity .…”

Section: Resultsmentioning

confidence: 94%

“…ZrO 2 has been previously used as SCR catalyst carrier due to its excellent thermal stability, surface acidity, although its redox ability should be neglected in the low temperature SCR because Zr 4+ ions were unreducible below 800 °C. ZrO 2 can interact with the metallic active components which lead to the change of electronic structure and oxidative states of the metallic components and promote NO x conversion …”

Section: Introductionmentioning

confidence: 99%

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

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Background Selective catalytic reduction of nitrogen oxides with ammonia (NH3‐SCR) is an effective method for the nitrogen oxides (NOx) removal. This study aimed to develop a highly efficient NH3‐SCR catalyst using the naturally available Montmonrillonite (Mt) clay as the catalyst support. Results Mt was processed into PILC by Al/Zr intercalations, impregnated with MnCe mixed active components and loaded with transition metals to achieve X‐AlZr‐PILC‐MnCe (X = V, W, Co or Mo) catalysts. The optimized Mo‐AlZr‐PILC‐MnCe showed the best NH3‐SCR performance with a NO conversion rate of nearly 100% in the temperature range of 240–300 °C, and N2 selectivity of above 85% in the range of 140–300 °C. Conclusions The catalysts were characterized by SEM, BET, XRD, XPS, H2‐TPR, NH3‐TPD to define the relationships between structure, chemical properties and catalytic activity. The enhanced catalytic performance of Mo‐AlZr‐PILC‐MnCe was mainly owing to the increased acidity and better redox ability. In situ DRIFT studies indicated the deposition of Mo changed the reaction from the E‐R to the L‐H mechanism. © 2020 Society of Chemical Industry

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“…Then, the fourth peak was associated to the interaction between bulk CeO 2 and Fe species (777 °C). Thereby, the broad peak around 777 °C were mainly regarded as the redox reaction between Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ , which was driven by the generation of Fe‐O‐Ce . However, with the addition of HSiW, a shift of reduction peaks toward higher temperature was observed on the rest of four catalysts, demonstrated the existence of the synergetic reactions among HSiW and Ce‐Fe‐O x and oxygen species .…”

Section: Resultsmentioning

confidence: 99%

Silicotungstic acid modified Ce‐Fe‐O_x catalyst for selective catalytic reduction of NO_x with NH₃: Effect of the amount of HSiW

Song

Xing

Zhang

et al. 2019

Applied Organom Chemis

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The HSiW(x)/Ce‐Fe catalysts were used to research the effect of silicotungstic acid contents on the catalytic activity in the selective catalytic reduction of NOx with NH3. Doping different contents of silicotungstic acid affected surface species and redox property as well as the catalytic activity. With the increasing amount of HSiW (x = 5%, 10% and 20%), the redox reaction between Fe3+/Fe2+ and Ce4+/Ce3+ enhanced, which could improve the ratio of Ce3+ and Fe3+. And then, more Ce3+ increased the ratio of chemisorbed oxygen (Oα). Besides, the type and strength of acid sites over HSiW(x)/Ce‐Fe was affected by the HSiW contents. These factors facilitated the catalytic performance. Thus, the NOx conversion of HSiW(x)/Ce‐Fe(x = 20%) was higher than 90%, which maintained in a wide temperature range between 200 and 400 °C.

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Mechanistic aspects of NH3-SCR reaction over CeO2/TiO2-ZrO2-SO42− catalyst: In situ DRIFTS investigation

Cited by 153 publications

References 53 publications

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Silicotungstic acid modified Ce‐Fe‐O_x catalyst for selective catalytic reduction of NO_x with NH₃: Effect of the amount of HSiW

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Mechanistic aspects of NH3-SCR reaction over CeO2/TiO2-ZrO2-SO42− catalyst: In situ DRIFTS investigation

Cited by 153 publications

References 53 publications

High N2 selectivity in selective catalytic reduction of NO with NH3 over Mn/Ti–Zr catalysts

High N2 selectivity in selective catalytic reduction of NO with NH3 over Mn/Ti–Zr catalysts

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

Silicotungstic acid modified Ce‐Fe‐Ox catalyst for selective catalytic reduction of NOx with NH3: Effect of the amount of HSiW

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High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Silicotungstic acid modified Ce‐Fe‐O_x catalyst for selective catalytic reduction of NO_x with NH₃: Effect of the amount of HSiW