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 N2 within wide temperature ranges: 180–500 °C (at GHSV = 18,000 h−1) and 260–500 °C (at GHSV = 54,000 h−1). Moreover, the dual-zone catalyst provides favorable NH3-slip removal efficiency even at NH3/NO = 1.60.
KeywordsLow-temperature NH3-SCR NH3 oxidation Honeycomb cordierite Monolithic catalyst FeBeta Mn–Ce/FeBeta
Electron microscopy characterization was performed in the Department of Structural Studies of N.D. Zelinsky Institute of Organic Chemistry RAS, Moscow.