Bulletin of the Korean Chemical Society

  • 제10권6호
  • /
  • Pages.535-543
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  • 1989
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  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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A Study on the Chemisorption of Carbon Monoxide on Silica-Supported Rhodium

  • Jo Woong Lee (Department of Chemistry, College of Natural Sciences, Seoul National University) ;
  • Seihun Chang (Department of Chemistry, College of Natural Sciences, Seoul National University) ;
  • Won-Il Chung (Department of Chemistry, College of Natural Sciences, Seoul National University)
  • 발행 : 1989.12.20
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초록

We have investigated the infrared absorption spectra for carbon monoxide chemisorbed on reduced and oxidized Rh/$SiO_2$ 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/$SiO_2$ while for oxidized Rh/$SiO_2$ 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/$Al_2O_3$ system instead of Rh/$SiO_2$ 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.

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