Preparation of Ultrafine RuOfTiO2 Binary Oxide Particles by a Sol-Gel Process

Ultrafine binary oxide particles of RuQ-TiO2 have been prepared by a sol-gel process consisting of hydrolysis and condensation f metal alkoxides in the liquid phase. This process enabled us to obtain desired rutile-type solid solution oxides of ruthenium and titanium with well-defined stoichiometry, except for the Ti-rich oxide composition, which appear not to form a homogeneous solid solution. RuO2-TiO2 or RuO2-TiO2-IrO2 coated titanium electrodes are now indispensable anodes in the chlor-alkali industry. These coatings are usually prepared by thermal decomposi-tion of metal chloride and alkoxide after painting them with solvent on titanium substrates. A variety of micro-analyses have revealed that the surface composition and features of these electrodes are not homogeneous. 1- ~ In or-der to clarify the physical properties of these electrocata-lysts in detail and develop more extensive application, it is desirable to establish a new method of preparing not onl