Catalysis of hydrogen sulfide oxidation by carbonaceous surfaces for effective sulfur impregnation

摘要

Procedures of activated carbon sulfur impregnation through H2S oxidation was investigated for the purpose of producing highly effective sorbents for elemental mercury control in coal-fired power plants. H2S oxidation reaction temperature ranged from 20～150°C, reaction time from 10~30 minutes, and hydrogen sulfide concentration from 2.5～25%. Free oxygen was found to greatly enhance hydrogen sulfide chemical sorption and sulfur loading. Sulfur deposit on carbon surface under all the experimental conditions chosen in this study possesses high thermal stability for enhanced mercury adsorption. The effects of hydrogen treatment, nitric acid treatment, and acid washing were investigated for BPL carbon. Furthermore, a preliminary study on the impacts of surface properties such as: surface functional groups, ash content, and total surface area were also conducted using several commercially available carbons.