Revealing the crystal facet effect on N2O formation during the NH3-SCR over α-MnO2 catalysts

Guo, Jundong; Gan, Fengli; Zhao, Yi-Fan; He, Jinglin; Wang, Bangda; Gao, Tao; Jiang, Xia; Ma, Shenggui

doi:10.1039/d2ra06744g

Cited by 8 publications

(1 citation statement)

References 57 publications

(70 reference statements)

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“…Then, the N 2 O formation for different crystal phases 2 of 15 of manganese oxide (α-MnO 2 , β-MnO 2 , γ-MnO 2 and σ-MnO 2 ) catalysts during a lowtemperature NH 3 -SCR reaction was investigated in our study using DRIFT measurement, which generated a higher content of N 2 O even at a low temperature [11]. Guo et al [12] investigated the atomic-level mechanism of N 2 O formation on the α-MnO 2 catalyst via DFT calculations and thermodynamics/kinetic analysis and pointed out that the (310) plane of α-MnO 2 owned the highest N 2 selectivity by avoiding NH 3 dissociation. Some studies have attempted to enhance the catalyst activity and N 2 selectivity at the same times.…”

Section: Introductionmentioning

confidence: 94%

Low-Temperature NH3-SCR Performance and In Situ DRIFTS Study on Zeolite X-Supported Different Crystal Phases of MnO2 Catalysts

et al. 2023

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In this study, a series of zeolite-X-supported different crystal phases of MnO2 (α-MnO2, β-MnO2, γ-MnO2, and σ-MnO2) catalysts were prepared via a solid-state diffusion method and high-heat treatment method to explore their low-temperature NH3-SCR performance. All of the catalysts featured typical octahedral zeolite X structures and manganese dioxides species of various crystal types dispersed across the support surface. Throughout the entire temperature range of the reaction, γ-MnO2/X catalyst had the highest NO conversion. Additionally, β-MnO2/X, γ-MnO2/X, and σ-MnO2/X catalysts had nearly 100% of N2 selectivity, whereas the α-MnO2/X catalyst had the lowest N2 selectivity (about 90%) below 125 °C. Moreover, the γ-MnO2/X catalyst demonstrated superior acidity capacity and reduction ability compared with the other three catalysts. All the catalysts contained the essential intermediates NH2NO and NH4NO3 species, which are essential to the SCR reaction. More acid sites and nitrate species existed on the γ-MnO2/X catalyst than on the other catalysts, thereby boosting the SCR reaction.

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Section: Introductionmentioning

confidence: 94%

Low-Temperature NH3-SCR Performance and In Situ DRIFTS Study on Zeolite X-Supported Different Crystal Phases of MnO2 Catalysts

et al. 2023

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Mechanistic Analysis of Urea Electrooxidation Pathways: Key to Rational Catalyst Design

Medvedev,

Delva,

Klinkova

2024

ChemPlusChem

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Urea electrolysis is an emerging approach to treating urea‐enriched wastewater and an attractive alternative anodic process to the oxygen evolution reaction (OER) in electrochemical clean energy conversion and storage technologies (e.g., hydrogen production and CO2 electroreduction). While the thermodynamic potential for urea oxidation to dinitrogen is quite low compared to that of the OER, the catalysts reported to date require high overpotentials that far exceed those for the OER. Consequently, there is much room for improvement and rational catalyst design for the urea oxidation reaction (UOR). At the same time, due to the urea molecule having a more complex structure than water, UOR can lead to the formation of various products beyond the commonly assumed N2 and CO2. This concept article will critically assess recent efforts of the research community to decipher the formation mechanisms of UOR products focusing on the systematic analysis of the reaction selectivity. This work aims to analyze the current state of the art and identify existing gaps, providing an outlook for the future design of UOR catalysts with superior activity and selectivity by applying the knowledge of the molecular transformation mechanisms.

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Promoting the NH3-SCR performance of Fe2O3-TiO2 catalyst through regulation of the exposed crystal facets of Fe2O3

Teng,

Li,

Dai

et al. 2024

Applied Surface Science

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Revealing the crystal facet effect on N₂O formation during the NH₃-SCR over α-MnO₂ catalysts

Abstract: High-index facet of α-MnO2 (310) exhibits the best NH3-SCR catalytic performance and highest N2 selectivity compared to the (100) and (110) facets.

Cited by 8 publications

References 57 publications

Low-Temperature NH3-SCR Performance and In Situ DRIFTS Study on Zeolite X-Supported Different Crystal Phases of MnO2 Catalysts

Low-Temperature NH3-SCR Performance and In Situ DRIFTS Study on Zeolite X-Supported Different Crystal Phases of MnO2 Catalysts

Mechanistic Analysis of Urea Electrooxidation Pathways: Key to Rational Catalyst Design

Promoting the NH3-SCR performance of Fe2O3-TiO2 catalyst through regulation of the exposed crystal facets of Fe2O3

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