文摘
Temperature-dependent effects of SO2 on selective catalytic reduction (SCR) of NO by NH3 over a TiO2 and carbon nanotubes (CNTs) supported iron鈥揷opper oxides catalyst were examined. At temperature below 300 掳C, deposition of sulfites and sulfates on the catalyst surface suppressed NH3 adsorption, NO adsorption, and oxidation, which induced catalyst deactivation. The deposited sulfite/sulfates could be partially removed by 400 掳C postannealing, which regenerated the catalyst. At temperature above 350 掳C, NO adsorption was promoted by SO2 introduction, and suppression of NH3 adsorption also minimized the side reaction of NH3 oxidation, which increased the NO removal efficiency from 68% to 80% through reaction between adsorbed NO and gaseous NH3.