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The Effects of Various Parameters of the Microwave-Assisted Solvothermal Synthesis on the Specific Surface Area and Catalytic Performance of MgF2 Nanoparticles

Abstract : High-specific-surface-area MgF2 was prepared by microwave-assisted solvothermal synthesis. The influences of the solvent and the magnesium precursors, and the calcination atmospheres, on the nanoparticle sizes and specific surface areas, estimated by X-Ray Powder Diffraction, N2 sorption and TEM analyses, were investigated. Nanocrystallized (~7 nm) magnesium partially hydroxylated fluorides (MgF2−x(OH)x) with significant specific surface areas between 290 and 330 m2∙g−1 were obtained. After activation under gaseous HF, MgF2−x(OH)x catalysts underwent a large decrease of both their surface area and their hydroxide, rates as shown by their 19F and 1H solid-state NMR spectra. Expect for MgF2 prepared from the acetate precursor, an activity of 30–32 mmol/h∙g was obtained which was about 40% higher compared with that of MgF2 prepared using Trifluoroacetate method (21.6 mmol/h∙g).
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02961375
Contributeur : Annie Ribaud <>
Soumis le : mercredi 18 novembre 2020 - 18:04:06
Dernière modification le : vendredi 30 avril 2021 - 03:26:36
Archivage à long terme le : : vendredi 19 février 2021 - 20:40:35

Citation

Yawen Wang, Zahra Gohari Bajestani, Jérôme Lhoste, Sandy Auguste, Annie Hémon-Ribaud, et al.. The Effects of Various Parameters of the Microwave-Assisted Solvothermal Synthesis on the Specific Surface Area and Catalytic Performance of MgF2 Nanoparticles. Materials, MDPI, 2020, 13 (16), pp.3566. ⟨10.3390/ma13163566⟩. ⟨hal-02961375⟩

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