| 초록 |
We have studied the formation of N2O in the reduction of NO by NH3 over V2O5/TiO2-based catalysts that had been promoted using iron oxide loading. The iron oxides could lead not only to a great depression of N2O production at high temperature side, but also to an increase in the deNOxing performances at low temperatures; however, each extent depended significantly on the oxide amount. XRD measurements disclosed that all the iron oxides are dispersed to amorphous nanoparticles. Temperature-programmed reduction of the promoted catalysts showed a complicated H2 consumption that takes place due to the nanodispersed iron oxides, vanadia, and sulfates. The presence of the iron oxides allowed the vanadia to be reduced at a lower temperature and strengthened a stability of the sulfate species even under a reducing environment. This can modulate the extent of N2O production at high temperatures, consistent with NH3 TPD measurements with the promoted catalysts. |
