Non-supported La-Ni systems and La, Ni systems either supported on an Al-pillared montmorillonite clay or incorporated in a montmorillonite clay were prepared. Their catalytic activity for the hydrogenation of benzene was evaluated over a range of 70-170 degrees C under atmospheric pressure, in a differential bench scale reactor. Surface area measurements and X-ray diffraction were used as tools for characterizing the catalysts. Catalyst initial activities, their performance after prolonged time on stream as well as the clay impact on the supported metals activity were examined. The non-supported La-Ni system calcined at 600 degrees C formed the LaNiO3 perovskite phase and it was the most active catalyst after its reduction. The influence of the mode of catalyst preparation, the calcination temperature and the Ni loading on hydrogenation activity are also discussed.