Oxidization of SO2 by Reactive Oxygen Species for Flue Gas Desulfurization and H2SO4 Production

Abstract

A strong ionization dielectric barrier discharge was used to produce a high concentration of reactive oxygen species that were then injected into a simulated flue gas in a duct to remove SO 2 by oxidation. Sulfuric acid (H 2 SO 4 ) was produced through the following two reactions: (1) O 3 oxidation of SO 2 -SO 3 , which then reacted with H 2 O to produce H 2 SO 4 ; and (2) reaction of O 2? with H 2 O to produce ÁOH radicals, which then rapidly and non-selectively oxidized SO 2 -H 2 SO 4 . When the molar ratio of reactive oxygen species to SO 2 was 4:1, the SO 2 removal efficiency was 94.6%, the energy consumption per cubic meter of flue gas was 13.3 Wh/m 3 , the concentration of recovered H 2 SO 4 was 4.53 g/l, and the H 2 SO 4 recovery efficiency was 28.8%. The H 2 O volume fraction in the simulated flue gas affected the SO 2 removal efficiency, whereas the O 2 and CO 2 volume fractions did not. These results prove that oxidation by reactive oxygen species is a feasible method for flue gas desulfurization.

On the Reactive Molten Salt Synthesis, Solubility and Na-Ion Storage Performance of Na2Mo2O7

“…It is also worth mentioning that the SO 2 produced in the reaction 3 can be used in a variety of applications including the production of sulfuric acid. 56,57 Interestingly, the presence of Cl 2 can facilitate the conversion of SO 2 to H 2 SO 4 . 58 SO 2 can also be used as a reductant in reducing bleaching, and the reduction of residual chlorine gas in water resources.…”

Roles of the Comproportionation Reaction in SO2 Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides

“…Nonferrous smelting industries, which use sulfide ores, are now major sources of SO 2 , typically containing 1–10 wt % sulfur. , Although a portion of SO 2 can be converted to produce sulfuric acid (H 2 SO 4 ), this low-value product is challenging to store and transport due to its bulkiness. In addition, some SO 2 is scrubbed into wastewater, forming hard-to-recycle waste acids or salts, leading to resource wastage and pollution. , In contrast, adsorbing and regenerating SO 2 into highly concentrated or liquid SO 2 has become an established sulfur recovery method using ionic liquids, deep eutectic solvents, organic amines, and Na 2 SO 3 . − Moreover, reducing highly concentrated SO 2 to S 8 can not only eliminate pollution concerns but also yield valuable sulfur resources for industrial applications and energy storage. − …”

“…In addition, some SO 2 is scrubbed into wastewater, forming hardto-recycle waste acids or salts, leading to resource wastage and pollution. 9,10 In contrast, adsorbing and regenerating SO 2 into highly concentrated or liquid SO 2 has become an established sulfur recovery method using ionic liquids, deep eutectic solvents, organic amines, and Na 2 SO 3 . 11−13 Moreover, reducing highly concentrated SO 2 to S 8 can not only eliminate pollution concerns but also yield valuable sulfur resources for industrial applications and energy storage.…”

Development Trends of Non-thermal Plasma (NTP) Technology Used in Environmental Pollutants Treatment: A Patent-Bibiometric Analysis

“…Its advantages are low energy consumption, low pollutant removal rate, simple reactor structure, wide application range, no secondary pollution, and can achieve coordinated control of pollutants such as NO, SO 2 , and Hg 0 under normal temperature and pressure [8] . Researchers have carried out a lot of research on the application of NTP technology in the treatment of VOCs [9] , desulfurization and denitrification [10][11][12][13][14] , heavy metal removal [15][16][17][18] , and also applied for a large number of patents.…”