Abstract
Infrared spectroscopy has been used to monitor the exchange of D 2 (g) with OH groups chemisorbed on Al 2O 3. It has been shown that near 300 K, the rate of the exchange process is rapid in the presence of supported Rh particles on the Al 2O 3. A qualitative model for hydrogen “spillover” is presented in which dissociative adsorption of dihydrogen by the metal is a key step. It is shown that CO chemisorption on the supported Rh leads to a marked reduction in the “spillover” rate due to site blockage on the Rh. This is consistent with recent studes of behavior of the CO and H coadsorbed on Rh (111).
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