Impregnating CuCl on AC (activated coke) support to synthesize xCuCl/AC showed superior activity with higher 90% Hg removal efficiency at 80-140 °C, as well as a lower oxygen demand of 2% O for Hg removal. The acceleration on Hg removal was observed for NO and SO. The BET, SEM, XRD, XPS, TPD, and FT-IR characterizations revealed that the larger surface area, sufficient active oxygen species and co-existence of Cu and Cu may account for the efficient Hg removal. In addition, the low demand of gaseous O was contributed to higher content of active oxygen and formed active Cl. After adsorbing on Cu sites, Cl sites, and surface functional groups, the Hg removal on xCuCl/AC was proceeded through two ways. Part of Hg was oxidized by active O and formed Hg, and the other part of Hg combined with the active Cl, which was formed by the activation of lattice Cl with the aid of active O, and formed HgCl. Besides, the Hg detected in outlet gas through mercury speciation conversion and desorption peak of HgCl and Hg further proved it. As displayed in stability test and simulated industrial application test, CuCl/AC has a promising industrial application prospect.
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