Characterizations of Manganese-Based Desulfurated Sorbents for Flue-Gas Desulfurization

For the application of dry flue-gas desulfurization, Mn2O3/SiC desulfurated sorbents with various manganese contents are prepared by the sol–gel method. The desulfurization performance of the sorbents is evaluated by a fixed-bed reactor with the simulated flue gas. X-ray diffraction and scanning electron microscope are adopted to characterize the crystalline phases and microstructure of the sorbents, respectively. For all the sorbents, the SO2 removal efficiency is above 93%, attributed to the nanoscale oval-shaped Mn2O3. For the sorbent with a manganese content of 50%, its breakthrough time reaches 27 min, benefiting from the uniform dispersion of SiC and Mn2O3. Compared to the sorbents with SiC, the breakthrough time of pure Mn2O3 is much shorter, resulting from the agglomeration of active component. Choosing Mn2O3 as the active component and SiC as the supporter to remove SO2 from flue gas has the obvious advantages of high SO2 removal efficiency rate.