Studies on the Enhancement of Flue Gas Desulfurization with Oxidation Reaction

The widely applied desulfurization technologies for flue gas are based on the acidic property of SO₂. However, CO₂ is also acidic, and the content of CO₂ in flue gas is several orders higher than that of SO₂; therefore, the interference of CO₂ on desulfurization is a problem and an origin of secondary pollution. A reaction-enhanced sorption method is presented and tested in the present work. CO₂ remained unchanged while the detrimental acidic species are oxidized and captured by adsorbent. The irreversibility of reactions and the large surface area of adsorbent guaranteed a complete capture of SO₂. A breakthrough capacity of adsorbent as large as 323 mg/g was observed on a SBA-15 mesoporous adsorbent. The by-products produced at regeneration are of market value, and the desulfurization technique does not yield secondary pollution