Insight into the praseodymium effect on the NH3-SCR reaction pathways over W or Nb supported ceria-zirconia based catalysts

Croisé, Charlotte; Pointecouteau, Rémy; Akil, Joudia; Demourgues, Alain; Bion, Nicolas; Courtois, Xavier; Can, Fabien

doi:10.1016/j.apcatb.2021.120563

Cited by 19 publications

(6 citation statements)

References 47 publications

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“…Previous studies revealed that acidic supports could bind to alkali metal K, freeing active metal sites 13 . The WO 3 was used widely as an acid additive in NH 3 ‐SCR catalysts 1 . In our previous work, we found that the SCR activity of a Fe/ZrO 2 catalyst was greatly improved by introducing W into the ZrO 2 support 30 .…”

Section: Introductionmentioning

confidence: 96%

“…13 The WO 3 was used widely as an acid additive in NH 3 -SCR catalysts. 1 In our previous work, we found that the SCR activity of a Fe/ZrO 2 catalyst was greatly improved by introducing W into the ZrO 2 support. 30 However, the effect of W modification in the support on the K-tolerance performance of Fe/ZrO 2 catalysts has not been reported yet, and the relevant reaction mechanism also was not not clear enough.…”

Section: Introductionmentioning

confidence: 99%

“…Selective catalytic reduction (SCR) of nitrous oxides (NO x ) with ammonia (NH 3 ) as reductant is used worldwide in mobile and stationary sources to reach strict emission standards. 1 During the past decades, commercial vanadium pentoxide/titania (V 2 O 5 / TiO 2 ) catalysts modified by tungsten oxide (WO 3 ) or molybdenum oxide (MoO 3 ) have been the most widespread and effective SCR catalysts. 2,3 But V-based catalysts still have certain disadvantages, such as poor low-temperature performance, narrow activity temperature range and biological toxicity, which limits their application in some other areas.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x

Han

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND: Selective catalytic reduction (SCR) of nitrous oxides (NO x ) with ammonia (NH 3 ) as reductant is used worldwide in mobile and stationary sources to reach strict emission standards. It is a feasible strategy to modify support with acidic metal oxides to improve the alkali metal potassium (K) tolerance of SCR catalysts. Herein, a comparative investigation was conducted based on iron/zirconium dioxide (Fe/ZrO 2 )and Fe/ZrO 2 -tungsten (W) catalysts to reveal the correlation of support modification with W and K-tolerance performance. RESULTS: The NO x conversion for K-Fe/ZrO 2 catalyst was <80% across the whole temperature range, and the catalyst was completely deactivated at ≈400 °C. As expected, the Fe/ZrO 2 -W catalyst exhibited a much superior anti-K-performance in comparison to the Fe/ZrO 2 catalyst. The active temperature window for K-Fe/ZrO 2 -W catalyst was 285-485 °C (NO x conversion of >80%).CONCLUSION: According to the characterization results, it was found that K-species impose a negative impact on NH 3 adsorption on the surface of the Fe/ZrO 2 catalyst, especially drastically preventing the adsorption of NH 3 species on Brønsted acid sites, thus inhibiting the occurrence of SCR reactions via the Langmuir-Hinshelwood (L-H) mechanism. By contrast, W modification resulted in more chemisorbed oxygen, stronger redox capacity and an increased Fe 3+ /(Fe 3+ +Fe 2+ ) ratio on the surface of the Fe/ZrO 2 -W catalyst. More importantly, W modification brought about abundant Brønsted acid sites, significantly promoting NH 3 adsorption and activation. W modification also weakened the adsorption stability of NO x species to a certain extent. As a result, SCR reactions over the Fe/ZrO 2 -W catalyst could proceed via both Eley-Rideal (E-R) and L-H pathways.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x

Han

et al. 2023

J of Chemical Tech & Biotech

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“…Among these, exhaust gas after-treatment technology is currently the most widely used technology to eliminate diesel exhausts. Exhaust gas after-treatment technology mainly includes: diesel oxidation catalyst (DOC) for oxidation removal of CO, hydrocarbons and soluble organic fractions (SOF), catalyzed diesel particulate filter (CDPF) for filtration and catalytic elimination of PM, continuous regenerating trap (CRT, consists by DOC and DPF) for regeneration of particulate trap, selective catalytic reduction (SCR), and nitrogen oxide storage reduction (NSR) for elimination of NO x . However, the above-mentioned methods could not simultaneously remove PM and NO x by one technology .…”

Section: Introductionmentioning

confidence: 99%

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

Zheng

Liu

et al. 2021

J. Phys. Chem. C

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Diesel engines have been widely applied, while the pollutants emitted from diesel engines have caused serious environmental pollution and human health hazards, especially for soot and NO x . Nowadays, the design and preparation of catalysts with excellent catalytic activity for simultaneous removal of soot and NO x is a great challenge in the field of diesel exhaust abatement. In this work, a series of three-dimensional ordered macroporous (3DOM) La1–x K x MnO3 catalysts with high activity for the simultaneous elimination of soot and NO x were synthesized by the colloidal crystal template method. The physicochemical properties of the as-prepared catalysts were characterized via XRD, Raman, FT-IR, SEM, TEM, N2 adsorption–desorption, XPS, H2-TPR, O2-TPD, NH3-TPD, NO-TPD, NO-TPO, and so on. The results of catalytic performance illustrated that 3DOM La0.75K0.25MnO3 exhibited highest catalytic activity with a maximum concentration of CO2 at 357 °C (T 10 = 336 °C, T 50 = 365 °C, and T 90 = 406 °C) and 50–60% NO conversion in the temperature range of 140–260 °C. Meanwhile, the reaction mechanism of 3DOM La1–x K x MnO3 catalysts was also proposed based on the characterization results and DFT calculation. The reasons for high catalytic activity are related to the strong oxidizability of high-valence B-site ions, the abundance of active oxygen species and suitable acid sites, good reducibility, and the 3DOM structure.

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Mesoporous–optimized BaMnO3 perovskite small-scale nanocrystals in SSZ-13 to enhance activity for the selective catalytic reduction reaction of NO

Chen

et al. 2022

Applied Catalysis A: General

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Insight into the praseodymium effect on the NH3-SCR reaction pathways over W or Nb supported ceria-zirconia based catalysts

Cited by 19 publications

References 47 publications

Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x

Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

Mesoporous–optimized BaMnO3 perovskite small-scale nanocrystals in SSZ-13 to enhance activity for the selective catalytic reduction reaction of NO

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Insight into the praseodymium effect on the NH3-SCR reaction pathways over W or Nb supported ceria-zirconia based catalysts

Cited by 19 publications

References 47 publications

Comparative study on K‐tolerance performance of Fe/ZrO2 and Fe/ZrO2‐W catalysts for NH3‐SCR of NOx

Comparative study on K‐tolerance performance of Fe/ZrO2 and Fe/ZrO2‐W catalysts for NH3‐SCR of NOx

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NOx from Diesel Engines

Mesoporous–optimized BaMnO3 perovskite small-scale nanocrystals in SSZ-13 to enhance activity for the selective catalytic reduction reaction of NO

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Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x

Comparative study on K‐tolerance performance of Fe/ZrO₂ and Fe/ZrO₂‐W catalysts for NH₃‐SCR of NO_x

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines