MgO prepared with the sol−gel technique had
crystalline structure defects, obtained from X-ray powder
diffraction and crystalline structure refinement, that correlated with
its acidic and basic sites. The acidic
sites, measured by adsorbing pyridine and NH3, were found
when brucite and MgO coexisted, which only
occurred after annealing the sample at 673 K. Two different basic
sites, measured by adsorbing CO2, were
present in a total concentration of about 1021 sites per
gram. These sites correlated to the presence of
magnesium
vacancies in MgO crystal. Both basic site and magnesium vacancy
concentrations diminished when the
sample annealing temperature was increased.
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