Fibrous natural silicates (sepiolite), instead of more conventional active carbon, have been sulfurized to be used as remover agents of mercury vapors from contaminated industrial waste gases. The Claus reaction, 2nH2S + nSO2 --> (3n/x)S(x) + 2nH2O, at low temperature (<400 K) and reactant concentrations (2-3% molar) has been used as the sulfur source, thus being an additional way of eliminating SO2 from metallurgical processes and urban areas. The process has been carried out in a fluidized bed reactor of the semicontinuous type, and various homogeneous materials with sulfur contents in the range 3-40% S were generated. Sulfur condensation results in catalyst deactivation but, prior to its stabilization as monoclinic sulfur, also acts as cocatalyst of the reaction contributing to its overall kinetics. A study of the operating conditions, temperature, reactant concentration, and textural properties of the solid on the yield of sulfur deposited has been made. Different pore-plugging mechanisms have been applied, and from them, the influence of temperature in sulfur distribution has been concluded. In this paper, TA, N2 adsorption at 77 K, and mercury-intrusion porosimetry were used to characterize the resulting adsorbents.