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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 10, Number 6
BKCSDE 10(6)
June 20, 1989 

A Study on the Chemisorption of Carbon Monoxide on Silica-Supported Rhodium
Jo Woong Lee*, Seihun Chang, Won-Il Chung
We have investigated the infrared absorption spectra for carbon monoxide chemisorbed on reduced and oxidized Rh/SiO2 with and without potassium coating within the frequency range of 1800-2200 cm-1 at various Rh concentrations, CO pressures, and temperatures. In case of no potassium coating, only two bands at 2070 and 1900 cm-1 appeared for CO adsorbed on reduced Rh/SiO2 while for oxidized Rh/SiO2 four bands were found at 2100, 2070, 2040, and 1900 cm-1. We have successfully tried to explain the differences between our observations and those by other investigators who used the Rh/Al2O3 system instead of Rh/SiO2 on the basis of the suggestions by Yates et al. Accordingly, we propose that the surface OH groups are deeply involved in producing the Rh+1 sites which are responsible for the gem-dicarbonyl species. On coating with potassium all the IR bands for three carbonyl species were found to suffer red shift, the magnitude of which increased with increasing Rh/CO ratio.
535 - 543
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