The deep catalytic oxidation kinetics of different aromatic hydrocarbons, in lean mixtures, over a Pt catalyst has been investigated. The reactivity increases in the order benzene > toluene > ethylbenzene > o-xylene > styrene. An apparent zeroth-order kinetics with respect to hydrocarbon concentration has been observed; the dependence on the oxygen partial pressure is more complex. Experiments with mixtures containing up to four hydrocarbons have been carried out. Remarkable effects on reaction rate and selectivity have been evidenced; the strongest inhibiting effect is shown by styrene and increases in a reverse order with respect to that of reactivity. A significant increase in the ignition temperature may occur in real burners. A kinetic model assuming strong irreversible adsorption of the aromatics and nonequilibrium adsorption of the oxygen over different sites has been proposed.