Chromium oxide was supported on different commercial aluminas. Their characteristics were
assessed by different techniques (X-ray diffraction, X-ray photoelectron, laser Raman, and
electron paramagnetic resonance spectroscopies, and Brunauer−Emmett−Teller surface, temperature-programmed reduction, and temperature-programmed desorption measurements). The
variation of the Cr3+/Cr6+ ratio was accounted for by the interaction between the chromium
phase and the support. The tendency of Cr3+ to form aggregates such as Cr2O3 was induced by
the support. The features of the support exert an influence upon chromium stabilization both
in its oxidation states 6+ and 3+ and in the coordination of surface chromia species. The total
acid sites and the oxidized chromium have a marked effect on activity and selectivity at initial
operation times.
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