A bifunctional MnO @PTFE catalytic membrane for efficient low temperature NO -SCR and dust removal

Feng, Shasha; Zhou, Mengdi; Han, Feng; Zhong, Zhaoxiang; Xing, Weihong

doi:10.1016/j.cjche.2019.11.014

Cited by 16 publications

(5 citation statements)

References 44 publications

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“…For PCDD, after C–O breaking, chlorinated benzenes or chlorinated phenols are formed. For PCDF, after C–O breaking, chlorinated biphenyls or chlorinated biphenyl phenols are formed. , (2) The C–Cl bond was abstracted via nucleophilic substitution, then formed phenyl radical and phenyl radical species, then attacked by hydroxyl radical and active oxygen and generated phenoxy radical and oxygenated hydrocarbons and then decomposed to aldehydes or ketones. , (3) The product contains a variety of long-chain hydrocarbons, indicating that the C–C bond was broken, undergo further oxidization to the final products, namely, CO 2 , H 2 O, HCl, and so on.…”

Section: Resultsmentioning

confidence: 99%

“…Feng et al found that the MnOx-wrapped PTFE membrane does not allow particles that are smaller than 1.0 μm to pass through and has the best NO conversion efficiency at 160−210 °C. 5 Kang et al studied the preparation of catalyst MnOx by the co-precipitation method and loaded it onto a fabric bag to test its performance in removing particulate and NOx simultaneously in a pilot experiment. When the temperature was 150 °C and the catalyst loading was 420 mg/m 3 , the REs of particulate and NOx reached 99 and 92.6%, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…However, the research of CF bags mainly focuses on the removal of NOx and less on PCDD/F in flue gas. Feng et al found that the MnOx-wrapped PTFE membrane does not allow particles that are smaller than 1.0 μm to pass through and has the best NO conversion efficiency at 160–210 °C . Kang et al studied the preparation of catalyst MnOx by the co-precipitation method and loaded it onto a fabric bag to test its performance in removing particulate and NOx simultaneously in a pilot experiment.…”

Section: Introductionmentioning

confidence: 99%

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Functional MCFe@PTFE Filters for the Catalytic Oxidation of PCDD/Fs at Low Temperatures

Qiu

Peng

Minghui

et al. 2023

Ind. Eng. Chem. Res.

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The treatment of particulates and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the municipal solid waste flue gas using a catalytic filter (CF) has gained substantial attention recently. However, coupling PCDD/F oxidation catalysts into the PTFE filter remains a challenge. Herein, the MnCeFeOx@PTFE (MCFe@PTFE) CF for the removal of particulates and PCDD/F was prepared by the ultrasonic immersion and foam coating method. The effects of the catalyst loading amount, reaction temperature, and filtration velocity on the low-temperature catalytic performance of the MCFe@PTFE CF for the removal of PCDD/F model compounds have been thoroughly investigated. Further investigations were conducted, namely, Brunauer–Emmett–Teller analysis, scanning electron microscopy, thermography/differential thermography, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The characterization results demonstrated that the catalyst loading has little effect on the physical properties of the bags. In addition, the physical properties and removal performance of MCFe@PTFE on particulates and PCDD/F were studied systematically. The PCDD/F removal efficiency by the MCFe@PTFE CF can reach 82.30% at 180 °C under a face velocity and catalyst loading amount of 0.5 m/min and 300 g/m2, respectively. Moreover, the dust RE of the CF is as high as 99.97%. The main byproducts of PCDD/F catalytic oxidation were identified by GC–MS. Possible reaction pathways for the catalytic oxidation of PCDD/F were proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Functional MCFe@PTFE Filters for the Catalytic Oxidation of PCDD/Fs at Low Temperatures

Qiu

Peng

Minghui

et al. 2023

Ind. Eng. Chem. Res.

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“…NOx in the atmosphere is one of the main causes of the formation of acid rain, PM10 and PM2.5 fine particulate matter, and photochemical smog. It can be seen that the existence of NOx in the atmosphere not only causes environmental pollution, but also affects human health [5][6][7][8][9]. At present, the commonly used denitrification technologies of flue gas mainly include:…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field

Li,

Zhiguo,

Zhang

2024

Waste Biomass Valor

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In SCR system, the velocity of flue gas field varies with the load, forming a gradient flow field. The characteristics of gradient flow field have important influence on the physical deactivation of catalyst. Through CFD simulation in this paper, it was found that the relative standard coefficients of flow field with characteristic flow velocity were 10.03%, 12.48% and 14.37% respectively. The uniformity of flow field deteriorated with the increase of flow velocity, and the alternating flow field was more likely to scour, wear and block the catalyst channel, leading to its inactivation. This conclusion is also confirmed by the test data obtained from the measuring points installed in various parts of the system. Through LES simulation, it is found that alternating flow field will generate transient turbulent vortices in the system, and with the increase of velocity, the number and distribution range of transient turbulent vortices increase rapidly. In the low-speed flow field, the flow field at the inlet Angle of the flue is disordered, and the velocity varies from 2.42m /s to 8.14m /s. At the corner of flue gas outlet, the flow velocity also varies between 4.86 m/s and 9.03 m/s, but there is laminar flow near the wall. The transient vortices are triggered by the laminar stripping mechanism near the wall. In high velocity flow field, the number of turbulent vortices increases sharply, especially on the surface of the first layer catalyst, which has a great influence on its activity.

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“…It is found that MnO x /PPS exhibits a > 80% NO removal efficiency at 140− 180 °C, and PPy coating enhances its mechanical strength but decreases the NO conversion. Feng et al 17 compared the NH 3 -SCR of NO and dust filtration performance of MnO x with different morphology-modified PTFE catalytic membranes and found that ripplelike and rodlike MnO x -modified PTFE catalytic membranes show the best NH 3 -SCR denitration (NO removal efficiency of >80% at 130−250 °C) and dust filtration performance (particle interception >99.88% for 0.3− 10 μm), respectively. However, PPS has a low filtration for ultrafine dust, which might lead to the abrasion and poisoning of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Flowerlike FeO_X–MnO_X Amorphous Oxides Anchored on PTFE/PPS Membrane for Efficient Dust Filtration and Low-Temperature No Reduction

Luo

Zeng

et al. 2022

Ind. Eng. Chem. Res.

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The design and preparation of efficient catalytic membrane is the key to realizing dust filtration and denitration in one unit. Herein, flowerlike Mn y Fe z O x amorphous oxide catalysts were anchored on a PTFE/PPS membrane via hydrothermal methods. The uniform flowerlike structure has low gas resistance and can provide large surface area. The synergy effect between Fe and Mn species promotes the growth of Mn y Fe z O x catalyst on PTFE/PPS membrane, and it is conducive to the improvement of the surface acidity and redox properties. Because of the largest surface area, as well as suitable redox property and surface acidity, the NO removal efficiency of Mn4Fe1O x @PTFE/PPS catalytic membrane is always >90% at temperatures of 115–180 °C under a gas hourly space velocity (GHSV) of 74 000 mL g–1 h–1. The durable test results reveal that Mn4Fe1O x @PTFE/PPS has excellent long-term stability and SO2/H2O resistance. Finally, dust filtration test results show that Mn4Fe1O x @PTFE/PPS has good dust filtration performance under different conditions. Overall, the data obtained in this work suggest that the Mn4Fe1O x @PTFE/PPS catalytic membrane has great application prospects in the simultaneous dust and NO purification of low-temperature flue gas. We expected that this work can shed some light on the design and preparation of catalytic membranes.

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A bifunctional MnO @PTFE catalytic membrane for efficient low temperature NO -SCR and dust removal

Cited by 16 publications

References 44 publications

Functional MCFe@PTFE Filters for the Catalytic Oxidation of PCDD/Fs at Low Temperatures

Functional MCFe@PTFE Filters for the Catalytic Oxidation of PCDD/Fs at Low Temperatures

Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field

Flowerlike FeO_X–MnO_X Amorphous Oxides Anchored on PTFE/PPS Membrane for Efficient Dust Filtration and Low-Temperature No Reduction

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A bifunctional MnO @PTFE catalytic membrane for efficient low temperature NO -SCR and dust removal

Cited by 16 publications

References 44 publications

Functional MCFe@PTFE Filters for the Catalytic Oxidation of PCDD/Fs at Low Temperatures

Functional MCFe@PTFE Filters for the Catalytic Oxidation of PCDD/Fs at Low Temperatures

Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field

Flowerlike FeOX–MnOX Amorphous Oxides Anchored on PTFE/PPS Membrane for Efficient Dust Filtration and Low-Temperature No Reduction

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Flowerlike FeO_X–MnO_X Amorphous Oxides Anchored on PTFE/PPS Membrane for Efficient Dust Filtration and Low-Temperature No Reduction