Determination of the Extinction Coefficient of Carbon Monoxide Adsorbed on Titanium Dioxide

Adsorption of carbon monoxide on a TiO2 (anatase) surface at room temperature has been studied by IR spectroscopy and volumetry. The obtained experimental data indicate weak adsorption of CO molecules on an exponentially inhomogeneous surface. It is established that adsorption enthalpy decreases according to the logarithmic law with a coverage increase in the range of 0.002-0.03. Values of the extinction coefficient of adsorbed CO for a heterogeneous CO/TiO2 system are calculated using the Bouguer-Lambert-Beer law and taking into account the Lorentz field correction. The validity conditions of the Bouguer-Lambert-Beer law for studying heterogeneous systems are described.

Automated summary

The adsorption of carbon monoxide on a TiO2 (anatase) surface at room temperature was investigated using IR spectroscopy and volumetry. The experimental results suggest a weak adsorption of CO molecules on an exponentially inhomogeneous surface. It was observed that the adsorption enthalpy decreases logarithmically with increasing coverage in the range of 0.002-0.03. The extinction coefficient of adsorbed CO in a heterogeneous CO/TiO2 system was calculated using the Bouguer-Lambert-Beer law and Lorentz field correction, considering the validity conditions for studying heterogeneous systems.