The features of the interaction of hydrogen sulfide with the surface of supports (alumina and silica) and catalysts (Pt/SiO2, Pt/Al2O3, Re/Al2O3, and Pt-Re/Al2O3) have been studied. It has been found that the adsorption of sulfur on the supports is completely reversible. The amount of irreversibly adsorbed sulfur (S-irrev) and S-irrev/metal ratios in the catalysts after treatment in a hydrogen atmosphere at 500A degrees C have been determined. Sulfurization reduces the dispersion of platinum to 5% and increases the amount of ionic platinum on the catalyst surface. Regarding the dehydrocyclization reaction of n-heptane, the optimal amount of sulfur required for sulfurization of the catalyst with the composition 0.25% Pt 0.3% Re/gamma-Al2O3 (0.3% Zr) is 0.072 wt %.