A modified autoclave hypercritical drying procedure has been used to prepare a hydrated form of MgO from Mg(OCH3)2 in a methanol-toluene solvent mixture. This material was prepared with 1000 m2/g surface area and 35-Å crystallite size. Heat treatment of this precursor at 500 °C under vacuum yielded the dehydrated MgO with 500 m2/g surface area and 45-Å crystallite size. The samples were further characterized by Fourier transform infrared/photoacoustic spectroscopy (FT-IR/PAS), X-ray diffraction, scanning electron microscopy, and chemical analyses. The hydrated precursor contained some residual -OCH3 groups and was much less crystalline in appearance than conventionally prepared MgO-Mg(OH)2 samples. The dehydrated material was free of -OCH3 groups and was made up of much smaller crystallites than conventionally prepared MgO.
|Original language||English (US)|
|Number of pages||7|
|Journal||Chemistry of Materials|
|State||Published - Jan 1 1991|
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Chemistry