| dc.description.abstract | Various perovskite-type catalysts including single-type La0.7Ce0.3SrNiO4, and double-type LaSrFeNiO6 and LaBaFeNiO6 have been prepared and investigated for the effectiveness in removing NO and N2O from gas stream. The results indicate that three catalysts developed are of good activity for decomposition of NO and N2O. Especially, 100% NO decomposition efficiency could be achieved at 500℃ as double-type perovskite (LaSrFeNiO6 or LaBaFeNiO6) is applied. Also, N2O decomposition efficiency achieved with double perovskites reaches 100%. However, oxygen always exists in the flue gas of stationary sources to occupy active sites of catalyst and decrease the conversions of NO and N2O. In order to overcome the negative effect of O2 on catalyst activity, activated carbon and double perovskite-type catalysts are combined to form a two-staged system for simultaneous removal of NO. Activated carbon is considered as good material for the treatment of NOx due to its good catalytic property toward removal and adsorption of NOx. More importantly, O2 could react with activated carbon to form CO which can serve as good reducing agent for effective removal of NOx. Decomposition tests of NO and N2O are performed with perovskite-alone and two-staged system (perovskite + activated carbon), respectively. The results obtained indicate that 100% NO removal efficiencies can be achieved at 300oC even in the presence of 6% O2, 5% H2O(g), and 50 ppm SO2. Total gas flow rate is controlled at 1300 mL/min, corresponding to a gas hourly space velocity (GHSV) of 10,000 hr?1. Overall, double perovskite-type catalysts developed show high efficiencies for NO and N2O removal, and they are characterized with XRD, BET, SEM, XPS and H2-TPR. Overall, the results indicate that high NO and N2O removal efficiencies can be achieved with the two-staged system. | en_US |