Development of Catalyst for Industrial Flue Gas Denitration at Low Temperature

Abstract

The most effective technology currently for flue gas denitrition is selective catalytic reduction (SCR). And the major problem against spreading SCR technology is the high cost and low efficiency of the catalyst for SCR. Al2O3 supported Mn-Fe oxide precursor was prepared through water/ethanol coprecipitation and then nitridized through NH3-TPD. Thus the inexpensive and efficient Mn-Fe-O-N/Al2O3 catalyst was obtained. The catalyst with a Mn/Al molar ratio of 0.4 and a Fe loading of 6.0 wt.% was testified to have the best performance for denitrition. The NOx conversion reached 95% at low temperature (150~200°C).

Recent progress of low-temperature selective catalytic reduction of NOx with NH3 over manganese oxide-based catalysts

“…Furthermore, the introduction of Mo also reduced the deactivation of the catalyst and increased the effective temperature range of SCR reaction. Yang et al89 indicated that the conversion of NO on the Fe-Mn/Al 2 O 3 catalyst exceeded 95% at 150-200 1C. It was concluded that the doping of Fe accelerated the electron transfer between Mn n+ and Fe n+ at different valence states and enhanced the synergistic effect between the active component MnO x and the carrier Al 2 O 3 , which improved the redox performance and surface acidity of the catalyst.…”