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- W4309477218 abstract "Selenium pollution by coal utilization is of increasing concern. Calcium-iron (Ca–Fe) oxygen carriers (OCs) and alkali metal ions have strong inhibitory effects on selenium, which can reduce the emissions of selenium vapor. The retention mechanisms of selenium by Fe2O3, CaFe2O4, Ca2Fe2O5 and bottom ash are investigated during chemical looping gasification (CLG). Iron-based OC can oxidize H2Se(g) to SeO2(g); furthermore, lattice oxygen is released by Fe2O3, contributing to the formation of an Fe–O–Se structure to retain selenium and form selenite. Because calcium ferrite is poorly oxidizing, it cannot oxidize H2Se(g), but the CaO produced when OCs are reduced can react with H2Se(g) to form CaSe(s), and this process can be promoted by H2S(g). The best retention rates reached 32.301% when Ca2Fe2O5 was used. In the cyclic experiment, the selenium retention of the bottom ash gradually increases. Alkali metal ions in bottom ash are the main factor in retaining selenium. Ca2+ and Mg2+ do not easily vaporize due to their high melting points; therefore, their selenium retention is significantly better than that of K+ and Na+. This research provided a new idea for the removal of selenium by using OCs and bottom ash particles during CLG." @default.
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- W4309477218 date "2023-08-01" @default.
- W4309477218 modified "2023-10-17" @default.
- W4309477218 title "Retention mechanism of calcium ferrite and compositions of ash on selenium during chemical looping gasification" @default.
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- W4309477218 doi "https://doi.org/10.1016/j.partic.2022.11.002" @default.
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