Abstract
A magnetic sorbent of Ce-doped Fe–Mn sorbent (Fe–Mn–Ce) was synthesized to capture gaseous elemental mercury from coal-fired flue gas. The physical and chemical properties of Fe–Mn–Ce sorbent were characterized by N2 adsorption, vibrating sample magnetometer, X-ray diffraction, transmission electron microscope, and X-ray photoelectron spectroscopy (XPS). The mercury removal capability of Fe–Mn–Ce sorbent was tested in a fixed-bed system, and the effect of flue gas temperature and O2 was investigated. The valence change of Fe 2p, Mn 2p, Ce 3d, O 1s, and Hg 4f on the sorbent surface during mercury removal process was analyzed. Finally, the mechanism of mercury removal by the Fe–Mn–Ce sorbent was explored. The result shows that the synthesized Fe–Mn–Ce sorbent consists of many extremely small nanoparticles, contains a polycrystalline structure, and shows good mercury removal performance. High temperature is beneficial to mercury removal by the Fe–Mn–Ce sorbent, but the 6% O2 in flue gas plays a negligible ro...
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