Abstract: Catalytic reduction of SO2 to elemental sulfur can not only remove SO2 pollution but also obtain elemental sulfur. The reaction process and catalytic mechanisms for the reduction of sulfur dioxide to sulfur are discussed in detail when carbon，hydrogen，methane and carbon monoxide are used as the reductant respectively. Merits and demerits of different reductant are compared. Carbon thermal reduction of SO2 and direct catalytic reduction of SO2 by CO in flue gas are proposed to be the important development direction.

摘要： 催化还原二氧化硫为单质硫不仅可消除二氧化硫污染，而且可得到有价值的单质硫。本文对分别以炭、氢气、甲烷、一氧化碳等为还原剂将二氧化硫还原为单质硫的催化剂、反应过程及催化机理做了详细阐述；分析了各种还原剂还原二氧化硫的优缺点，指出炭热还原二氧化硫和直接利用烟气中一氧化碳还原二氧化硫是未来发展的重要方向。