The esterification of stearic acid using titanates fixed on alumina or silica as catalysts has been studied. The anchoring of titanium, obtained by action of CH3Ti(OR)3with the acid sites of the support, has been studied using different contact times and different concentrations. The heterogeneized catalyst leads to a better efficacity than the homogeneous system. The activity of the catalyst is strongly increased by using crushed solid instead of balls. The catalyst has been recovered and recycled. The stability of the (M)–Ti(OR)3bond (with M = Al2O3or SiO2) has been shown by kinetic measures and exchange reactions of the alcoxy groups fixed on titanium with heavy alcohol.