The Michael addition reaction has been carried out with silyl enol ether and Michael accepters such as acrylates, and alpha,beta-unsaturated ketones over aluminum-free titanium silicates (TS-1 and TS-2) in the absence of H2O2. The reaction was carried out slightly above room temperature (40 degrees C) in the presence of dry solvents giving moderate to good yield. The effect of various modified zeolites like RE-Y, La-Y, steamed-Y, Na-Y, VS-1, SnS-1, Zn/ZSM-5 and different solvents has been studied. The catalytic activity is explained on the basis of "oxophilic Lewis acidity" of titanium silicate molecular sieves.