Novel promoting effects of tungsten on the selective catalytic reduction of NO by NH3 over MnOx–CeO2 monolith catalyst

A series of tungsten modified MnOx–CeO2 monolith catalysts were prepared and used for selective catalytic reduction (SCR) of NO by NH3 in the presence of O2. The experimental results showed that the SCR performance and SO2-resistant ability of MnOx–CeO2 were greatly enhanced by the introduction of tungsten. The catalyst containing 10% WO3 showed the highest NO conversion in a wide temperature range of 162–374 °C. The highly dispersed or amorphous tungsten oxide and the strong interaction between tungsten and MnOx–CeO2 should be the reasons for the excellent performance of the catalyst containing 10% WO3.

The NO reduction activity was greatly enhanced by the introduction of tungsten over MnOx–CeO2 (MC) monolith catalyst. The 10% W–MC showed high NO conversion in the broad temperature range, and it is much better than that of the commercial V-based catalyst at low temperature.Figure optionsDownload as PowerPoint slideHighlights
► The SCR activity of MC was significantly improved by addition of tungsten.
► The addition of tungsten improved the H2O and SO2 resistant ability of MC.
► The NO conversion of 10%W-MC is much better than that of V-based catalyst.
► The addition of tungsten restrained the agglomeration of MnOx-CeO2 particles.