Mechanistic study of Ce-modified MnO
                x
            /TiO2 catalysts with high NH3-SCR performance and SO2 resistance at low temperatures

Li, Fengxiang; Xie, Jun; Fang, De; He, Feng; Qi, Kai; Gong, Pijun

doi:10.1007/s11164-017-2937-0

Cited by 32 publications

(9 citation statements)

References 47 publications

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“…Finally, NH 2 NO (ads) was degraded into N 2 (g) and H 2 O (g) following the Eley−Rideal mechanism (Reaction 11 to 13). 187,189 As a whole, the Langmuir−Hinshelwood mechanism and Eley−Rideal mechanism were both the pathway of the NH 3 -SCR reaction on the above catalysts.…”

Section: Scr + Catalytic Oxidation Of Cpm Organic Componentsmentioning

confidence: 85%

“…NO 2 – (ads) conducted a combination with NH 4 + (ads) adsorbed on Brønsted acid sites to form NH 4 NO 2 (ads), which was subsequently decomposed into N 2 (g) and H 2 O (g) . The above analysis declared that the denitrification was chiefly consistent with the Langmuir–Hinshelwood mechanism (Reaction –). − But for the Ni 0.1 -V-W/Ti catalyst, NO 3 – (ads) oxidized from NO 2 (ads) could interact with NH 4 + (ads) to form intermediate product NH 4 NO 3 (ads), which was dissolved into H 2 O (g) and undesired N 2 O (g) (Reaction and ) NH 3 false( normalg false) → NH 3 false( normalads false) on the Lewis acid sites NH 3 false( normalg false) → NH 4 + false( normalads false) on the Brønsted acid sites 2 NO false( normalg false) + O 2 false( normalg false) → 2 NO 2 false( normalads false) NO false( normalg false) + NO 2 false( normalads false) + 2 NH<...…”

Section: Catalytic Oxidation Of Cpm Organic Componentsmentioning

confidence: 97%

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Potential Strategy to Control the Organic Components of Condensable Particulate Matter: A Critical Review

Peng,

Liu,

Zhang

et al. 2024

Environ. Sci. Technol.

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More and more attention has been paid to condensable particulate matter (CPM) since its emissions have surpassed that of filterable particulate matter (FPM) with the largescale application of ultralow-emission reform. CPM is a gaseous material in the flue stack but instantly turns into particles after leaving the stack. It is composed of inorganic and organic components. Organic components are an important part of CPM, and they are an irritant, teratogenic, and carcinogenic, which triggers photochemical smog, urban haze, and acid deposition. CPM organic components can aggravate air pollution and climate change; therefore, consideration should be given to them. Based on existing methods for removing atmospheric organic pollutants and combined with the characteristics of CPM organic components, we provide a critical overview from the aspects of (i) fundamental cognition of CPM, (ii) common methods to control CPM organic components, and (iii) catalytic oxidation of CPM organic components. As one of the most encouraging methods, catalytic oxidation is discussed in detail, especially in combination with selective catalytic reduction (SCR) technology, to meet the growing demands for multipollutant control (MPC). We believe that this review is inspiring for a fuller understanding and deeper exploration of promising approaches to control CPM organic components.

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Section: Scr + Catalytic Oxidation Of Cpm Organic Componentsmentioning

confidence: 85%

Section: Catalytic Oxidation Of Cpm Organic Componentsmentioning

confidence: 97%

Potential Strategy to Control the Organic Components of Condensable Particulate Matter: A Critical Review

Peng,

Liu,

Zhang

et al. 2024

Environ. Sci. Technol.

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“…63 In the DTG curve, a weak peak appeared at 560 °C for the Cr/MnO 2 catalyst, while the Ag/Cr/MnO 2 catalyst showed strong peaks at 530 °C and 600 °C. The final mass loss of the Cr/MnO 2 and Ag/Cr/MnO 2 catalysts occurred at 670–1000 °C, which belonged to the decomposition of Mn 2 O 3 to Mn 3 O 4 , 64 with weight losses of 2.95% and 1.71% and significant endothermic peaks at 760 °C and 720 °C, respectively. According to the comparative analysis, the weight loss of the Ag/Cr/MnO 2 catalyst is smaller, indicating that the incorporation of Ag can improve the thermal stability of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

Ag-promoted Cr/MnO₂ catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature

Duan

Meng

Huang³

et al. 2023

Phys. Chem. Chem. Phys.

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“…Thus, all the catalyst samples are quite stable, indicating the good dispersity for V 2 O 5 and WO 3 on the catalyst surface or in the amorphous state. 32,33 It implies that V 2 O 5 forms polymerized or dispersed vanadium oxide species on the surface of supporting oxide (TiO 2 ). 34 There might be interactions between the dispersed active component and the supporting oxide.…”

Section: Methodsmentioning

confidence: 99%

Deactivation Influence of HF on the V₂O₅–WO₃–TiO₂ SCR Catalyst

et al. 2021

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The electrolytic aluminum waste contains harmful components, such as fluorides. Sending it to coal-fired boilers seems to be a prospective scheme to achieve the harmless treatment of waste. However, the negative influence of F on the SCR catalyst should be examined. In this study, a fixed-bed reactor system is built up to study the deactivation of the V2O5–WO3–TiO2 SCR catalyst by HF when the electrolytic aluminum waste is co-fired with coal in boilers. The activity of the catalyst is evaluated by the NH3-SCR reaction. The deactivation mechanism is investigated through tests of NH3 temperature-programmed desorption, H2 temperature-programmed reduction, X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller (BET), in situ diffuse reflectance infrared Fourier transform spectroscopy, and Raman spectroscopy. The results show that for deactivated catalyst samples, the SCR catalytic activity drops obviously, especially when they work at lower temperatures. Although HF could enhance Brønsted acid sites, increase the Oα (adsorbed oxygen) concentration, and facilitate the Lewis acid site formation, it would not compensate for decreases of V5+ on the catalyst surface and BET surface area, which results in an activity reduction of the catalyst sample.

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Mechanistic study of Ce-modified MnO x /TiO2 catalysts with high NH3-SCR performance and SO2 resistance at low temperatures

Cited by 32 publications

References 47 publications

Potential Strategy to Control the Organic Components of Condensable Particulate Matter: A Critical Review

Potential Strategy to Control the Organic Components of Condensable Particulate Matter: A Critical Review

Ag-promoted Cr/MnO₂ catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature

Deactivation Influence of HF on the V₂O₅–WO₃–TiO₂ SCR Catalyst

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Mechanistic study of Ce-modified MnO x /TiO2 catalysts with high NH3-SCR performance and SO2 resistance at low temperatures

Cited by 32 publications

References 47 publications

Potential Strategy to Control the Organic Components of Condensable Particulate Matter: A Critical Review

Potential Strategy to Control the Organic Components of Condensable Particulate Matter: A Critical Review

Ag-promoted Cr/MnO2 catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature

Deactivation Influence of HF on the V2O5–WO3–TiO2 SCR Catalyst

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Product

Resources

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Ag-promoted Cr/MnO₂ catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature

Deactivation Influence of HF on the V₂O₅–WO₃–TiO₂ SCR Catalyst