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