Mechanism Study of the Influence of Calcination Temperature on Mn-based SCR De-NOv Catalyst Activity Based on XPS Spectra Information
The oxidation state of manganese(Mn)in Mn-based denitrification(De-NOx)catalysts plays a crucial role in determining their activity.However,conventional X-ray photoelectron spectroscopy(XPS)analysis often over simplifies the fitting of the Mn 2p3/2 peak by assuming a symmetrical single peak,thereby neglecting the effects of peak asymmetries,multiple splitting and shake-up of satellite peaks,which introducing uncertainties into the analysis results.In this study,the XPS spectra information was used comprehensively,including the comparion of the peak-to-peak shape of the Mn 2p spectra,the Mn 3s spectra peak splitting spacing,the change of adsorbed oxygen and the content of elements on the catalyst surface,and peak intervals of Mn-Fe-Nb elements.Combined with the XRD phase analysis results,the different oxidation states and the mechanism of the influence of calcination temperature on De-NOx catalyst activity were determined,of which included Mn oxides species,surface adsorbed oxygen,surface exposure of Mn element and interaction between elements.Through the comprehensive leveraging of XPS spectra information,this paper makes up for the deficiency of single use of XPS spectral peak fitting,and provides methods for more effective use of XPS analysis technology and more reliable data support for catalyst activity prediction and formulation optimization in the research of Mn-based De-NOx catalysts.
万方数据
维普
