Iron oxide modified attapulgite (Fe2O3-ATP) catalysts, with special network structure, were prepared by molten salt method, and were applied to investigate Hg0 oxidation ability in simulated flue gas from 100 to 260°C. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy were employed to characterize the catalysts. The results showed that Fe2O3-ATP exhibited about 90% average Hg0 oxidation efficiency at 220°C. With the decrease of the Fe2O3 in Fe2O3-ATP, the Hg0 oxidation efficiency reduced. Furthermore, the flue gas components seriously affected the Hg0 oxidation. The presence of Cl2 and O2 could promote the Hg0 oxidation, while SO2 would inhibit Hg0 oxidation. Cl2 was the most effective component of the three for Hg0 oxidation.

Yu Lu, Jing Ling Shao, Hui Cang, Fen Nv Han, Zhi Dong Chen and Qi Xu