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http://dx.doi.org/10.5012/bkcs.2003.24.10.1437

Preparation of MgO with High Surface Area, and Modification of Its Pore Characteristics  

Lee, Moon-Hee (Department of Chemistry, Sookmyung Women's University)
Park, Dong-Gon (Department of Chemistry, Sookmyung Women's University)
Publication Information
Bulletin of the Korean Chemical Society / v.24, no.10, 2003 , pp. 1437-1443 More about this Journal
Abstract
Thermal decomposition of hydrated surface layer of $Mg(OH)_2$ at $500^{\circ}C$ in vacuum turned non-porous MgO into porous one with high surface area of around $270 m^2$/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${\AA}$. Rehydration followed by subsequent dehydration at $300 ^{\circ}C$ in dynamic vacuum further raised the surface area to 340 $m^2$/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 ${\AA}$. Application of $Fe_2O_3$ 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, $Fe_2O_3$ stayed on the surface possibly via spill-over reaction.
Keywords
Magnesium oxide; Surface area; Porosity; Micropore; Hydration;
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