Effect of MnSO4 on the Removal of SO2 by Manganese-Modified Activated Coke

In this study, the effect of manganese sulfate (MnSO4) on desulfurization capacity was investigated through carrying out consecutive desulfurizationregeneration cycles of MnO2-blended activated coke (Mn/AC). It was observed that MnSO4 was produced on the surface of Mn/AC during the desulfurization process, and the amount of MnSO4 accumulated on Mn/AC first increased significantly and then became relatively stable. In addition, the desulfurization results of MnSO4-impregnated Mn/AC indicate that Mn2+ from MnSO4 could form new liquid-phase catalysis, which existed with the solid-phase catalysis (blended MnO2) simultaneously in the desulfurization system. However, an excessive amount of MnSO4 over the surface of activated coke can block the access of SO2 to the pore network, hampering the activity of the solid-phase catalyst and, consequently, resulting in a decrease of desulfurization capacity