| Nowadays, air pollution has become one of the most concerned environmental problems in China, which is contradicted with people’s appeal to health. Among the causes, burning coal is the most serious one. The newly revised Atmospheric Pollution Prevention Act, People’s Republic of China (Revised Draft) highlights source control and technology control of haze to improve the status of air pollution. Therefore, developing the Coal-fired flue gas mercury removal technology collaborated with denitration technology is critical.In this work, iron-based spinel was selected as catalyst and the NH3-SCR performance of Mn-Fe spinel was invetegated. Then the mechanism of the NH3-SCR reaction by simulating the L-H and E-R reaction was studied. Meanwhile, the mechanisms of the adsorption of elemental mercury on Mn-Fe spinel and the interference of the contents of the flue gas with elemental mercury capture were studied. At last, the NH3-SCR ractivity of Mn-Fe spinel was regenerated by washing and thermal regeneration methods, and then centralized controlled the oxidization-reduction of gaseous elemental mercury to achieve regeneration of the catalyst.(1) Mn-Fe spinel showed excellent performance of NH3-SCR reaction except the H2O durability at 100℃-200℃. In the Mn-Fe spinel surface, adsorbed NH3 and NO were involved in NH3-SCR reaction, and the NH3-SCR reaction on Mn-Fe spinel reduced the NO through L-H and E-R mechanism.(2) Mn-Fe spinel had a large capture capacity of elemental mercury in 100℃-200℃. Low temperature would promote the capture capacity of elemental mercury. A certain amount of SO2 would form new reactive sites on Mn-Fe spinel surface and promote the adsorption. But the H2O would compete the active sites with the elemental mercury, thereby inhibiting the adsorption of elemental mercury.(3) On Mn-Fe spinel, Chemical adsorption of elemental mercury could be compatible with the SCR of NO with NH3. Washing and heat treatment could regenerate the Mn-Fe spinel catalysts. |
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