The optical reflectances of chromia—alumina catalysts in the visible and ultraviolet regions have been determined and, at the same time, the specific chromia surface areas measured by oxygen chemisorption. A relationship was found between the intensities of the charge-transfer bands of Cr6+ and the extent of chromia area, which permits one to determine the chromia area of a chromia—alumina catalyst from the optical reflectance spectra.
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Poole et al. (1964) studied this question.
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