Abstract
Infrared, EPR and reflectance spectra in the uv and visible region were measured for six different chromium(III) oxide preparations. With some samples also the changes of spectra caused by the use of the catalysts for dehydrogenation of isopropanol to acetone at 350 °C were studied. The results are interpreted in terms of the change of coordination of surface Cr 3+ atoms and interaction between them due to preparation variables, surface hydration and influence of the reactants. A linear correlation was found between the Racah parameter calculated from the reflectance spectra and sensitivity of the reaction rate of dehydrogenation of secondary alcohols R · CHOH · CH 3 to the change in the structure of the group R.
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