Abstract:Aiming at the difficulty of Hg0 removal from flue gas due to its indissolubility in water, a series of studies on the performance of elemental mercury (Hg0) removal from simulated flue gas were carried out with a laboratory-scale fixed-bed reactor using the Mn-Co/MCM-41 mesopore molecular sieve prepared by the wet impregnation method. The adsorbents were characterized by a variety of techniques such as N2 adsorption/desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), hydrogen gas temperature-programmed reduction (H2-TPR) and X-ray photoelectron spectra (XPS). The results showed that the additions of Mn and Co significantly enhanced the efficiency of Hg0 removal. With a Mn/Co molar ratio of 3/1, the Hg0 removal efficiency reached as high as 90% at 150℃. Compared with the single Mn or Co supported MCM-41 adsorbent, the presence of Co could not only lead to better dispersions of Mn and Co over MCM-41, but also promote the conversion of Mn3+ and Mn2+ to Mn4+ and the reduction abilities of Mn-Co/MCM-41 adsorbents, which would play important roles in promoting Hg0 removal.