Improvement of Low-Temperature Activity of FeBeta Monolith Catalyst in NH3-SCR of NOx

FeBeta||Mn-Ce/FeBeta catalyst was prepared by coating cordierite monolith with FeBeta zeolite followed by an impregnation of its downstream part by Mn-Ce solution. The resulting dual-zone catalyst demonstrates improved catalytic performance in the selective catalytic reduction of NOx by NH3 (NH3-SCR) as compared to the parent Fe-Beta. The catalyst exhibits 80-90% NOx conversion and 100% selectivity to N-2 within wide temperature ranges: 180-500 degrees C (at GHSV=18,000h(-1)) and 260-500 degrees C (at GHSV=54,000h(-1)). Moreover, the dual-zone catalyst provides favorable NH3-slip removal efficiency even at NH3/NO=1.60.