Datensatz

Zusammenfassung

In this study, non-thermal plasma (NTP) was adopted to improve the catalytic oxidation performance of Cu-Fe binary oxides (CFs) for efficient simultaneous removal of NO and Hg⁰ from coal combustion flue gas. Sample characterization indicated that the pore structure, surface morphology, and crystalline phases of CF samples were not changed after plasma treatment whereas the contents of lattice oxygen (O₁), Fe³⁺, and Cu²⁺ were largely increased. The treated CF samples exhibited far better NO removal performance compared with raw CF over a wide reaction temperature range (150–450 °C). The influences of plasma discharge time, discharge power, discharge atmosphere, and reaction temperature on NO removal performance were analyzed. O₂ facilitated Hg⁰ and NO removal·H₂O had adverse effect on Hg⁰ and NO removal. To some extent, the CF samples exhibited better resistant to sulfur poisoning due to the presence of Fe species. Moreover, the simultaneous removal behavior of Hg⁰ and NO over the modified CF samples were analyzed. NO facilitated Hg⁰ removal, but Hg⁰ had a slight inhibitory impact on NO removal. The optimum reaction temperature of simultaneous removal of NO and Hg⁰ was 300 °C. Finally, the mechanism responsible for NO/Hg⁰ removal was revealed, where CuO and Fe₂O₃ served as active components. During NO removal process, Fe³⁺, Cu²⁺, and O_l were first consumed and then recovered due to the existence of O₂. Hg⁰ catalytic oxidation dominated the Hg⁰ removal process because Hg⁰ adsorption equilibrium was reached in a short time.