Surface reactivity of Li2MnO3: Structural and morphological impact

Quesne-Turin, Ambroise; Vallverdu, Germain Salvato; Croguennec, Laurence; Allouche, Joachim; Weill, François; Ménétrier, Michel; Baraille, Isabelle

doi:10.1016/j.apsusc.2020.148514

Cited by 16 publications

(7 citation statements)

References 43 publications

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“…A variation of the Isat / I 2p3/2 ratio occurs with time, indicating a change in the manganese environment and/or oxidation state. 36,37 The MnO reference spectrum exhibits a similar shape but with a less intense satellite. 36 The MnO environment content increases with crystallization time from 26.7 to 39.5 % for 5 to 90 min (red curves).…”

Section: Resultsmentioning

confidence: 92%

Microwave-Assisted and Metal-Induced Crystallization: A Rapid and Low Temperature Combination

et al. 2020

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Here we present a new crystallization process, which by combining microwaves and metal-induced devitrification, reduces both the time and the temperature of crystallization compared to other 2 known methods. Titania crystallization initiates at a temperature as low as 125 °C within a few minutes of microwave radiation. Several cations induce this low-temperature crystallization: Mn 2+ , Co 2+ , Ni 2+ , Al 3+ , Cu 2+ and Zn 2+ . The crystallization mechanism is probed with electron microscopy, elemental mapping, single particle inductively plasma mass spectrometry, X-ray photoelectron spectroscopy, Auger electron spectroscopy and scanning Auger mapping. These techniques show that the metal ion migration through the vitreous titania under microwave radiation occurs prior to crystallization. The crystalline particles are suspended in solution at the end of the treatment, avoiding particle aggregation and sintering. The crystalline suspensions are thus ready for processing into a material or employment in any other application. This combination of microwaves and metal-induced crystallization is applied here to TiO2, but we are investigating its application to other materials as an ecofriendly crystallization method.

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Section: Resultsmentioning

confidence: 92%

Microwave-Assisted and Metal-Induced Crystallization: A Rapid and Low Temperature Combination

et al. 2020

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“…NMO-800_SO 2 has only one doublet with the S 2p 3/2 peak at 169.0 eV for SO 4 2– species . This behavior is in line with the previously reported work on SO 2 interaction with Li 2 MnO 3 , where SO 2 oxidized to SO 4 2– species (Figure d). , Similar results are available for SO 2 oxidation over Na–MnO x in moist conditions . SO 2 gas molecules reacted with the adsorbed water to form HSO 3 – ions (eq ).…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Na_0.4MnO₂ Microrods for Room-Temperature Oxidation of Sulfurous Gases

et al. 2022

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“…The formation of these three sulfur species upon H 2 S adsorption is well-documented for NaM x O y -type materials 9,41 . The HRXPS S 2p spectrum of NMO_SO 2 has only 57,65 . Moreover, our previous work confirmed SO 4 2− species formation over NaMn x O y after low-temperature SO 2 adsorption (Fig.…”

Section: Gas (Ppm) Flow Rate (L Minmentioning

confidence: 99%

Novel application of sodium manganese oxide in removing acidic gases in ambient conditions

Gupta

Achary

Viltres

et al. 2023

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In this study, we have demonstrated the application of sodium manganese oxide for the chemisorption of toxic acidic gases at room temperature. The fabricated alkali ceramic has Na0.4MnO2, Na2Mn3O7, and NaxMnO2 phases with a surface area of 2.6 m2 g–1. Na-Mn oxide was studied for oxidation of H2S, SO2, and NO2 gases in the concentration range of 100–500 ppm. The material exhibited a high uptake capacity of 7.13, 0.75, and 0.53 mmol g–1 for H2S, SO2, and NO2 in wet conditions, respectively. The material was reusable when regenerated simply by soaking the spent oxide in a NaOH-H2O2 solution. While the H2S chemisorption process was accompanied by sulfide, sulfur, and sulfate formation, the SO2 chemisorption process yielded only sulfate ions. The NO2 chemisorption process was accomplished by its conversion to nitrite and nitrate ions. Thus, the present work is one of the first reports on alkali ceramic utilization for room-temperature mineralization of acidic gases.

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Surface reactivity of Li2MnO3: Structural and morphological impact

Cited by 16 publications

References 43 publications

Microwave-Assisted and Metal-Induced Crystallization: A Rapid and Low Temperature Combination

Microwave-Assisted and Metal-Induced Crystallization: A Rapid and Low Temperature Combination

Fabrication of Na_0.4MnO₂ Microrods for Room-Temperature Oxidation of Sulfurous Gases

Novel application of sodium manganese oxide in removing acidic gases in ambient conditions

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Surface reactivity of Li2MnO3: Structural and morphological impact

Cited by 16 publications

References 43 publications

Microwave-Assisted and Metal-Induced Crystallization: A Rapid and Low Temperature Combination

Microwave-Assisted and Metal-Induced Crystallization: A Rapid and Low Temperature Combination

Fabrication of Na0.4MnO2 Microrods for Room-Temperature Oxidation of Sulfurous Gases

Novel application of sodium manganese oxide in removing acidic gases in ambient conditions

Contact Info

Product

Resources

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Fabrication of Na_0.4MnO₂ Microrods for Room-Temperature Oxidation of Sulfurous Gases