Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (07): 804-808.doi: 10.1016/S1872-1508(06)60033-8

• ARTICLE • Previous Articles     Next Articles

Preparation of Nanometer Magnesia with High Surface Area and Study on the Influencing Factors of the Preparation Process

GUAN Hong-Bo;WANG Pei;WANG Hui;ZHAO Bi-Ying;ZHU Yue-Xiang;XIE You-Chang   

  1. State Key Laboratory for Structural Chemistry of Unstable & Stable Species, Institute of Physical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2006-01-25 Revised:2006-02-28 Published:2006-06-27
  • Contact: ZHU Yue-Xiang

Abstract: Three kinds of MgC2O4•2H2O were prepared by precipitation method with different raw materials, and MgO with high surface area was obtained via thermal decomposition of MgC2O4•2H2O in different atmospheres. The precursor MgC2O4•2H2O and as-prepared MgO were characterized by XRD, BET, TEM, and TG-DTA measurements. It was found that using Mg(CH3COO)2•4H2O and H2C2O4•2H2O as the starting materials and calcining the precursor MgC2O4•2H2O in flowing dry gas are key factors to obtain high surface area MgO. The MgO prepared at the optimum condition is composed of nanocrystals with a size about 4~5 nm and forms a wormhole-like porous structure with a specific surface of 534 m2•g−1 after calcining at 520 ℃. In addition, the MgO has good thermal stability, after calcining at 650 ℃ and 800 ℃ for 2 h, its surface area is still 229 m2•g−1 and 134 m2•g−1, respectively.

Key words: Nanometer MgO, MgC2O4&bull, 2H2O, High surface area, Pore structure