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

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.

Automated summary

In this study, a novel MnOx catalyst derived from MOF was fabricated and showed excellent activity and SO2 tolerance for the selective catalytic reduction of NOx by NH3 at low temperatures. The addition of MOF precursor and doping PVP improved the catalyst's surface area, particle size, and crystalline defects. The Mn-MP catalyst exhibited abundant acid sites, Mn4+, and surface chemical oxygen, which promoted the NH3-SCR reaction. In situ DRIFTs revealed that the high SO2 tolerance of the catalyst was attributed to the reduced irreversible sulfurization rate and the promoting adsorption of active bidentate nitrates and NH4+ in the presence of sulfates.