Abstract
Rh catalysts prepared using NaX, NaY, Al 2O 3, TiO 2, and some modified oxides as supports have been characterized by FT-IR spectroscopy of CO adsorbed on the reduced samples. It has been found that the IR spectroscopie parameters k(CO) and kfe(CO—CO') obtained from the twin band due to the geminal dicarbonyl species are dependent on the support. The stretching parameter k(CO) increases in the order NaX < Al 2O 3 < NaY < TiO 2, indicating a decreasing back-bonding ability of supported Rh in the same order. This is in agreement with the desorption behaviour of CO on these catalysts. The intensity ratio of the symmetric and asymmetric stretching bands of CO indicates a bond angle of the carbonyl groups in Rh I(CO) 2 higher than 90° on zeolites and lower than 90° on TiO 2. The results are discussed in the context of the catalytic behaviour of the catalysts in the CO + H 2 reaction.
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