The catalytic hydrolysis of dichlorodifluoromethane (CFC-12) was investigated over solid acid Ti(SO4)(2). The catalytic activity decreased with the calcination temperature. When space velocity was 6 l h(-1) g-cat(-1), the CFC-12 conversion at 310 degrees C over Ti(SO4)(2) calcined at 350 degrees C remained about 98.5% during 360 h on stream, and the selectivity to by-products remained zero. Thr Findings enlarged the scope of traditional catalyst systems for the CFCs decomposition.