NOx selective catalytic reduction by ammonia over Cu-ETS-10 catalysts

Ion exchange method was used to fabricate Cu-ETS-10 titanosilicate catalysts, which possessed high activity, N2 selectivity and SO2 resistance for NOx selective catalytic reduction (SCR). N2 sorption measurements indicated that the microporous catalysts had high surface areas of 288–380 m2/g. The Cu content and speciation were investigated by inductively coupled plasma atomic emission spectrometry, H2 temperature-programmed reduction, and diffuse reflectance infrared Fourier transform spectroscopy. Various Cu species coexisted within the catalyst. Isolated Cu2+ species were the active sites for NH3-SCR, the number of which initially increased and then decreased with increasing Cu content. The catalytic activity of Cu-ETS-10 depended on the isolated Cu2+ species content.

Graphical AbstractIsolated Cu2+species were introduced to the titanosilicate structure by ion exchange, and the activity of the resulting Cu-ETS-10 catalysts for the NOxselective catalytic reduction by NH3depended strongly on isolated Cu2+content.Figure optionsDownload full-size imageDownload as PowerPoint slide