REMOVAL OF SO2 AND NO OVER RICE HUSK ASH (RHA)/CaO-SUPPORTED METAL OXIDES

The activity of rice husk ash (rha)/cao-based sorbent supported with variousmetal oxides for the removal of so2 and no from simulated flue gas ofcombustion process has been studied. in this study, rha/cao-based sorbentswere impregnated with an appropriate metal nitrates solution followed bydrying and calcinations, which resulted in the sorbent having the followingactive phases; mgo, mno, coo, zno, al2o3, fe2o3, and ceo2. the sorbentcatalystswere tested in a fixed bed reactor by passing mixture gas consisting of so2 (2000 ppm), no (500 ppm), o2 (10 %), water vapor (50%) and n2 as abalance at a total flow rate of 150 ml/min and reaction temperature of 87°c.the results showed that rha/cao sorbents impregnated with ceo2 displayedthe highest sorption capacity among other impregnated metal oxides for thesimultaneous removal of so2 and no. infrared spectroscopic results indicatethe formation of both sulfate (so42-) and nitrate (no3-) species due to a catalyticrole played by ceo2.