Simultaneous catalytic oxidation of Hg and AsH over Fe-Ce co-doped TiO catalyst under low temperature and reducing atmosphere.

The Fe-Ce bimetal oxide-doped titanium dioxide composite was synthesized by the sol-gel method and the performance of the catalyst was investigated for the removal of Hg and AsH from yellow phosphorus flue gas under different conditions. Brunauer-Emmett-Teller (BET) analysis, high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to characterize the crystal structure and morphology of the structure, and the mechanisms for removing Hg and AsH from flue gas by catalytic oxidation were deduced. The results showed that the optimal calcination temperature of the FeCeTi catalyst was 500 °C, and the optimal pH of the sol was 6. Under these conditions, the penetration adsorption capacity of the FeCeTi catalyst for the removal of AsH and Hg was 385.5 mg g and 2.178 mg g, respectively. According to characterization analysis, Fe and Ce are the main active components in the removal of Hg and AsH, and the mixed oxides of Fe and Ce have a synergistic effect on the surface of the mixed oxide-doped catalyst, which can improve the dispersion of the active component on the surface of the catalyst, and then improve the removal efficiency of Hg and AsH.