Hydrogenation activity in presence of sulfur has been studied for bimetallic Pt-GeAl2O3 and Pt-Pd/Al2O3 systems. It has been shown that addition of germanium to platinum decreases the rate of aromatic hydrogenation whereas the palladium-platinum system exhibits higher activity. On the basis of st precise description of physico-chemical properties of bimetallic particles (characterisation by TEM, EXAFS, LEIS, TPR), a concept of sulfur resistant catalyst is discussed taking into account each actor in the catalytic process and their role in the modification of the active site properties.