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S. N. Lanin, N. V. Kovaleva, Fam Tien Zung, K. S. Lanina

Adsorptive properties and the chemistry of the surface of MgO

Abstract

Adsorptive properties of the surface of MgO, which is used both as adsorbent and the support of the catalyst, were analyzed by the method of gas chromatography. As adsorbates there were used n-alkanes, which demonstrate just non-specific, dispersive interactions during the physical adsorption, and adsorbates whose molecules are able to interact specifically with the active centers on MgO surface. Adsorption isotherms of CHCl3, CH3NO2, CH3CN, (CH3)2CO, CH3COOC2H5 and (C2H5)2O) on MgO at 50–100°C were measured, differential molar enthalpy changes were found (-DH), which are equal to the adsorption molar heat, and for the polar adsorbates there were found energy contributions of dispersive and specific interactions to the -DH. Electron-accepting and electron-donor ability of MgO surface were estimated.
Moscow University Chemistry Bulletin.
2008, Vol. 49, No. 5, P. 300
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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