STUDY ON THE REGENERATION OF COPPER-MANGANESE SORBENT FOR REMOVAL OF SULFUR-DIOXIDE FROM FLUE-GASES

The work is part of a study on the development of a new method for sim ultaneous removal of nitrogen oxide (NO) and sulfur dioxide (SO2) from flue gases. The concept is based on a mixture of active components wi th two different functions: sorption of SO2 by silica-supported copper (II) oxide (CuO) and manganese(IV) oxide (MnO2) and selective catalyti c reduction (SCR) of NO with ammonia (NH3) in the presence of vanadium (V) oxide (V2O5). The paper is focused on the reductive regeneration o f mixtures of sulfates of manganese and copper, which are formed in th e desulfurization step. The reduction of pure unsupported MnSO4 with h ydrogen requires a higher temperature than that for CuSO4. Of principa l interest for this study is the possibility to decrease the temperatu re for the reduction of MnSO4 in order to facilitate the simultaneous regeneration of the sulfates in the sorbent. The results show that und er the selected experimental conditions the temperature for the reduct ion of the sulfated MnO2 in the desulfurization sorbents may be signif icantly lower compared to the temperature for pure MnSO4.