Kinetics and mechanism of low-temperature ozone ((5-50) x 10(-3) mol/m(3) in the gas-air mixture) decomposition by Go-catalysts supported on silica have been studied. Go-ions adsorbed on silica react with surface oxygen species, thus resulting in an active catalyst. Low concentrations of Go-ions form a monolayer on the surface, Their specific catalytic activity remained constant, but sharply decreased at higher concentrations due to a formation of polynuclear Go-complexes. Ozone decomposition may occur either as a stoichiometric or catalytic process, depending on the ozone and catalyst concentrations. The turnover number increases with ozone concentration reaching a saturation point. It also increases with Go-concentration in the beginning, but drops at a concentration >1 x 10(-4) mol/g. The mechanism of the reaction is discussed.