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• W3092093364 abstract "Abstract The interactions between selenium vapors and coal accessory Ca/Fe-minerals favor selenium emission control by transferring selenium into fly ash during coal combustion. Considering the complicated effects of iron transformation on selenium retention, iron species in fly ashes from seven coal-fired power plants were distinguished and the associations between selenium and iron minerals were assessed. Iron oxides (including Fe3O4, γ-Fe2O3 and ɑ-Fe2O3) were determined as the main form of iron minerals in fly ash. The adsorption of selenium vapors by different iron oxides was conducted at temperatures ranging from 300 to 900 °C and the species of captured selenium were identified. Furthermore, reaction sites on the surfaces of fresh and reacted iron oxides were compared to investigate the mechanism regarding selenium adsorption over these iron oxides, which were further clarified through density functional theory study. The results showed that iron oxides were surely to play a significant role in selenium retention mainly through chemisorption and the reactions probably occurred at temperatures below 900 °C. At 300 °C, ɑ-Fe2O3 had better selenium adsorption performance than Fe3O4/γ-Fe2O3. Regardless of iron species, Fe atoms on iron oxides participated in the selenium adsorption by forming a Se–O–Fe Structure. With temperature increasing, selenium adsorption by Fe atoms was suppressed, which caused a drop off in selenium capture capacity of Fe3O4 and ɑ-Fe2O3. Differently, increasing temperature promoted selenium adsorption over γ-Fe2O3, which owned a high selenium adsorption capacity even at 700 °C. Further analysis confirmed that the presence of O2/H2O(g) in the flue gas contributed to the formation of oxygen vacancies on the surface of γ-Fe2O3 at high temperatures and facilitated selenium vapors to react with Fe atoms." @default.
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• W3092093364 date "2021-01-01" @default.
• W3092093364 modified "2023-10-17" @default.
• W3092093364 title "Mechanism study of selenium retention by iron minerals during coal combustion" @default.
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• W3092093364 doi "https://doi.org/10.1016/j.proci.2020.08.006" @default.
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