Two-dimensional MnAl Mixed-Metal Oxide Nanosheets Prepared Via a High-Shear-mixer-facilitated Coprecipitation Method for Enhanced Selective Catalytic Reduction of NO with NH3

Mn-based mixed metal oxides (MMOs) have been considered to be low temperature denitration catalysts for selective catalytic reduction of NO with NH3. In this work, two-dimensional (2D) MnAl mixed-metal oxide nanosheets were successfully prepared via a high-shear-mixer-facilitated coprecipitation (HSM-CP) method. The as-obtained 2D MnAl-MMO achieved high specific surface area of 180.6 m(2)/g, average pore size of 9.8 nm and pore volume of 0.45 cm(3)/g. The as-obtianed MnAl-MMO (HSM-CP) catalysts performed superior NO conversion of 96.3% and N-2 selectivity of 91% at 200 degrees C with a gas hourly space velocity (GHSV) of 30,600 h(-1), all of which are much better than those of MnAl-MMO (CP). Even at 25 degrees C, the MnAl-MMO (CP) catalysts nearly had catalytic activity whereas MnAl-MMO (HSM-CP) achieved a better NO conversion of 40%. Moreover, MnAl-MMO (HSMCP) catalysts performed excellent H2O and SO2 resistance, and NO conversion is still remained 75% at 200 degrees C with 5% H2O and 100 ppm SO2. HSM-CP provides a new strategy for the development of MMO as efficient denitration catalysts.