3 years ago

MnOx-CeO2 supported on Cu-SSZ-13: A novel SCR catalyst in a wide temperature range

MnOx-CeO2 supported on Cu-SSZ-13: A novel SCR catalyst in a wide temperature range
A novel Mn-Ce/Cu-SSZ-13 catalyst was synthesized for the selective catalytic reduction of NO with NH3 (NH3-SCR) over a wide temperature range. The NO x conversions of this catalyst were above 90% from 125°C to 450°C. The catalyst also possessed good H2O and SO2 resistances at 300°C and possessed higher activities than Cu-SSZ-13 at 80°C to175°C and Mn-Ce at above 200°C. TPD and in situ DRIFTS analyses showed that bridging nitrate groups on Cu-SSZ-13 could not participate in the SCR reaction. Moreover, NH3 was easily adsorbed to form NH4NO3, which encased the surface of the catalyst, thereby blocking the pores and deactivating the active sites. However, for Mn-Ce/Cu-SSZ-13, the bridging nitrates were adsorbed onto the surface and then converted to monodentate nitrates, which acted as the active species for the SCR reaction at low temperature. This phenomenon might be the primary reason for the enhanced SCR performance of Mn-Ce/Cu-SSZ-13 compared with Cu-SSZ-13 at low temperature.

Publisher URL: www.sciencedirect.com/science

DOI: S0926860X17304040

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