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High-specific-surface-area MgF 2 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, N 2 sorption and TEM analyses, were investigated. Nanocrystallized (~7 nm) magnesium partially hydroxylated fluorides (MgF 2-x (OH) x ) with significant specific surface areas between 290 and 330 m 2 ∙g -1 were obtained. After activation under gaseous HF, MgF 2-x (OH) x catalysts underwent a large decrease of both their surface area and their hydroxide, rates as shown by their 19 F and 1 H solid-state NMR spectra. Expect for MgF 2 prepared from the acetate precursor, an activity of 30-32 mmol/h∙g was obtained which was about 40% higher compared with that of MgF 2 prepared using Trifluoroacetate method (21.6 mmol/h∙g).

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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