A novel reaction system involving BaS and [formula omitted] for converting [formula omitted] to elemental sulfur without generating pollutants: Part II. Kinetics of the hydrogen reduction of [formula omitted] to BaS

Abstract

The reduction of barium sulfate to produce barium sulfide is a part of the two-step process for converting sulfur dioxide to elemental sulfur, described in Part I. This reaction was investigated using a thermogravimetric analysis technique with and without an impregnated nickel catalyst at reaction temperatures between 700 and 1050 ∘ C . As an example of the reactivity of nickel-catalyzed barium sulfate powder, almost complete conversion was attained in about 3 min at 850 ∘ C under a hydrogen partial pressure of 86.7 kPa. The Prout–Tompkins nucleation and growth kinetics equation was found to be useful for describing the rate of this reaction, which had an activation energy of 210 kJ/mol for fresh barium sulfate powder and 143 kJ/mol for fresh nickel-catalyzed barium sulfate powder. The reduction reaction of nickel-catalyzed barium sulfate powder is of order 0.6 with respect to hydrogen partial pressure.