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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 24, Number 10
BKCSDE 24(10)
October 20, 2003 

Preparation of MgO with High Surface Area, and Modification of Its Pore Characteristics
Moon Hee Lee, Dong Gon Park
Magnesium oxide, Surface area, Porosity, Micropore, Hydration
Thermal decomposition of hydrated surface layer of Mg(OH)2 at 500 °C in vacuum turned non-porous MgO into porous one with high surface area of around 270 m2/g. Most of its surface area, 74 %, was from micropores, and rest of it was from mesopores in wedge-shaped slits, exhibiting bimodal size distribution centered around 30 and 90 A. Rehydration followed by subsequent dehydration at 300 °C in dynamic vacuum further raised the surface area to 340 m2/g. Fraction of microporous surface area was increased to 93%, and the shape of the mesopores was modified into parallel slits with a specific dimension of 32 A. Application of Fe2O3 over MgO via iron complex formation did not alter the pore characteristics of MgO core, except slightly increased pore dimension. Over the course of the modification, Fe2O3 stayed on the surface possibly via spill-over reaction.
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