Abstract
The role of potassium present on the surface or even built into the bulk has been studied in the chlorination of titanias by CCl 4 and COCl 4 to volatile TiCl 4. The solids to be chlorinated were characterized by atomic absorption spectroscopy (AAS) and X-ray induced photoelectron spectroscopy (XPS) and the kinetics of the reaction was followed by thermogravimetry (TG). In case of COCl 2 a catalytic effect of potassium was observed whereas, when chlorinating with CCl 4, potassium additives resulted in a strong retardation of the reaction. The results are interpreted in terms of the electronic structure of the solid surfaces and the different polarizability of the reactants.
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