The study on continuous denitrification, desulfurization of pyrolusite/activated coke hybrid catalyst

Abstract

In this study, the industrial application of pyrolusite/activated coke hybrid catalysts (ACP) for continuous SO₂ and NO removal was simulated and studied systematically. The obtained results show that the denitrification process of ACP before SO₂ removal had almost no influence on its desulfurization activity even though the surface functional groups showed variation. The denitrification property of ACP, however, significantly enhanced after desulfurization and regeneration. The NO removal efficiency of ACP increased from 74.2% to 100% and remained relatively stable, and the N₂ selectivity was higher than 90.2%. The formed metal sulfate (MnSO₄ and Fe₂(SO₄)₃), showed the catalytic activity, which synergistically worked with surface functional groups to improve the selected catalytic reduction (SCR) of NO. However, large quantity of the formed metal sulphates restricted the mass transfer on the surface of ACP, which caused the reduction of desulfurization performance and the hypothesis of NO conversion of ACP-Rn.