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The formation of the Rh I ion during CO chemisorption on Rh/Al 2 O 3 catalysts has been directly observed using UV−visible spectroscopy. Comparison of infrared and UV−visible spectra indicates that the species Rh I (CO) 2 is produced by a surface oxidation process operating on metallic Rh 0 sites and involving Al−OH groups as oxidizing centers, in agreement with previous postulates.
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Zubkov et al. (1999) studied this question.
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