Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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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)
  • Published : 2003.10.20
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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.

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