Selective catalytic reduction of NOx with NH3 over a novel MOF- derived MnOx catalyst

Abstract

A novel MnOx catalyst (Mn-MP) derived from MOF-Mn3(BTC)2(H2O)6 was fabricated and investigated for the selective catalytic reduction of NOx by NH3 at low temperatures. Mn-MP catalyst showed a superior activity and noticeably improved tolerance to SO2. The MOF precursor and doping PVP led to large surface area, small particle size and more crystalline defects of Mn-MP catalyst. The formation of abundant acid sites, Mn4+ and surface chemical oxygen would promote the NH3-SCR reaction. In situ DRIFTs demonstrated the high SO2 tolerance over the Mn-MP catalyst not only results from the reduced irreversible sulfurization rate, but also the promoting adsorption of active bidentate nitrates and NH4+ in the coexistence of sulfates. Our work shed light on the design of porous MOF-derived MnOx catalysts with high SO2 resistance at low temperatures.