Direct oxidation into sulfur in a pseudo-fluidized bed of spherical catalyst is a selective method of treating hydrogen sulfide-containing gases (HSCG) [1]. In contrast to the Claus method, it can be used for treating gases with a wide range of hydrogen sulfide contents [2]. "Acid" (as in Claus units) and hydrocarbon-containing (casing-heated petroleum, natural, refinery) gases can be treated with this method [3].