Biomass and Coal Modification to Prepare Activated Coke for Desulfurization and Denitrification

SO 2 and NOx in flue gas are serious environmental pollutants. As an excellent adsorbent, activated coke has good application potential in flue gas desulfurization and denitrification. In this study, different concentrations of NH 3 and K 2 CO 3 solutions were used to modify the activated coke made from biomass and coal, and then separate and coordinated desulfurization and denitrification experiments were carried out. The adsorption efficiency of activated coke and the adsorption capacity of SO 2 and NO were compared, and the adsorption relationship between SO 2 and NO was clarified. The changes of the surface functional groups of activated coke before and after adsorption and the forms of SO 2 and NO after adsorption were analyzed by Fourier transform infrared spectrometer and X-ray diffractometer patterns. Results show that K 2 CO 3 and NH 3 modification can promote the adsorption of SO 2 and NO in activated coke, and K 2 CO 3 modification is more significant for improving the denitrification and desulfurization capacity. When the unmodified activated coke synergistically adsorbs SO 2 and NO, there is a competitive adsorption between NO and SO 2 . However, when the activated coke modified with K 2 CO 3 solution and NH 3 synergistically adsorbs SO 2 and NO, both have a promoting effect. After the adsorption of NH 3 -modified activated coke, CaSO 4 and Na 2 SO 4 crystals will appear. K 2 SO 4 will exist after the adsorption of activated coke modified with K 2 CO 3 solution.