Experimental Investigation of Simultaneous Removal of SO2 and NOx Using a Heteropoly Compound

ABSTRACT Aiming at developing a simple, feasible method for SO2 and NOx removal, in this work, various doping amounts of heteropolyacid and heteropolyacid salts were prepared and used in wet absorption for simultaneous removal of SO2 and NO. The desulfurization and denitrification performance was evaluated by investigating dynamic SO2 and NO absorption in a simulated reactor containing a heteropoly compound (HPC) solution along with various factors influencing the reaction. The results demonstrate that this system had a high removal efficiency of SO2 and modest NO removal. The amount of Wolfram (W) doping and the pH of the solution affected the removal performance, and a stable SO2 removal efficiency higher than 95% was obtained for HPW1Mo at a pH = 5.5. In addition, the desulfurization performance of NaPWMo with a 50% removal efficiency was higher than that of the HPWMo solution (20%) after a 60 min reaction time. A high concentration of the NaPWMo solution and the presence of O2 were beneficial to desulfurization at room temperature. In addition, the removal efficiency of SO2 or NO on NaPWMo was only affected by its own gas concentration rather than their mutual influences on each other. This work should be beneficial to the optimization potential leading to the development of simultaneous desulfurization and denitrification systems in practical applications.