Desulfurization of CO:SO2 contaminated gases by manganous oxide

To contribute to the curtailment of anthropogenic emission of sulfurous compounds, the susceptibility of manganous oxide for sulfur under reducing atmospheres (C−O−S system) has been investigated over the temperature range 700 to 900°C (973 to 1173 K). A thermodynamic evaluation of the Mn−S−O system and the C−O−S system was undertaken and the basic, bivariant, and univariant equilibria in the Mn−S−O system over the temperature range 700 to 1100°C are listed. The kinetic investigation employed thermogravimetry and anin situ solid electrolyte oxygen probe to follow the sulfidization reaction of spherical MnO pellets under various experimental conditions. The kinetic evaluation was complemented by X-ray diffraction and krypton B.E.T. surface area analyses. Apparent activation energy of sulfidization of manganous oxide, under measured oxygen potentials in the C−O−S system, was determined to be 6.26 (±2.0) kcal/gmol (26.2 (±8.4) kJ/gmol), and a comparison with some alternative desulfurization agents in the H−O−S system is included.