The reactivation of CoNiAl calcined hydrotalcite-like compounds for the hydrolysis of carbonyl sulfide was studied. The catalytic activity could be recovered after immersing Na2CO3 and calcining catalyst under air flow at 350 degrees C. The fresh, deactivated, and reactivated catalysts were characterized by various techniques. The presence of sodium introduced in the reactivation was the main source of basicity. It combined with the active center NiO to recover the catalytic activity.