Promotional removal of gas-phase Hg0 over activated coke modified by CuCl2

Impregnating CuCl2 on AC (activated coke) support to synthesize xCuCl(2)/AC showed superior activity with higher 90% Hg-0 removal efficiency at 80-140 degrees C, as well as a lower oxygen demand of 2% O-2 for Hg-0 removal. The acceleration on Hg-0 removal was observed for NO and SO2. 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 Cu2+ may account for the efficient Hg-0 removal. In addition, the low demand of gaseous O-2 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-(ads)(0) removal on xCuCl(2)/AC was proceeded through two ways. Part of Hg-(ads)(0) was oxidized by active O and formed Hg-0, and the other part of Hg-0 combined with the active Cl, which was formed by the activation of lattice Cl with the aid of active O, and formed HgCl2. Besides, the Hg2+ detected in outlet gas through mercury speciation conversion and desorption peak of HgCl2 and Hg-0 further proved it. As displayed in stability test and simulated industrial application test, CuCl2/AC has a promising industrial application prospect.