Abstract
To develop a new process for reducing high-concentration SO2 to elemental sulfur, the reduction of SO2 with CO and activated carbon in a fixed bed experimental system was investigated. The effects of temperature, CO/SO2 molar ratio, and reaction time on SO2 reduction were studied. The results showed that the starting temperature of SO2 reduction with activated carbon was approximately 700 °C and that the addition of CO decreased the starting temperature to 400 °C. Higher temperature led to an increase in SO2 conversion. The S yield also increased initially but then decreased when the temperature exceeded 800 °C, due to the formation of COS. SO2 conversion increased with an increasing CO/SO2 molar ratio, the optimum S yield being achieved at a CO/SO2 ratio of 2. However, the existence of unreacted SO2 in the product decreased the S yield and resulted in an optimum S yield occurring at a low ratio. Lower selectivity of SO2 reduction to elemental sulfur was observed if reaction time was reduced. By prolongin...
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