| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 55717 | Catalysis Today | 2011 | 8 Pages |
A series of mono-functional M/SBA-15 (M = Cu, Fe, Cr, and Al) and bifunctional M′/SBA-15 (M′ = Cu–Al, Fe–Al, and Cr–Al) catalysts was prepared via an incipient wetness impregnation, and further characterized by N2 adsorption, XRD, TEM, H2-TPR, Al27-NMR, and XPS as well as activity test for C3H6 + NO + O2 reaction. Ordered mesoporous structure of SBA-15 was well maintained even after impregnating the various metallic components. The deNOx activities of investigated catalysts follow a trend of Cu–Al/SBA-15 > Cu/SBA-15, Fe/SBA-15 > Cr–Al/SBA-15 > Cr/SBA-15 ≫ Fe–Al/SBA-15, Al/SBA-15 > SBA-15. Synergistic effect between copper and alumina was achieved showing a satisfactory NO conversion of approximately 80% over Cu–Al/SBA-15 at temperature as low as 350 °C under an atmosphere of 3000 ppm NO, 3000 ppm C3H6, 1% O2 and GHSV of 60,000 h−1. The SCR performance was found to be strongly correlated to the redox properties of tested catalysts, essentially chemical nature of supported metals, and surface density of active metallic species.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (296 K)Download as PowerPoint slideHighlights► Copper or aluminum loading effectively enhances the NO conversion for bare SBA-15. ► Al presence is beneficial for suppressing the formation of CuO cluster and promoting the redox properties of Cu2+ species. ► Al nuclei have been mainly incorporated into the SBA-15 framework with the assistance of copper loading. ► A synergetic effect is achieved between copper and aluminum, resulting in an optimal performance over Cu–Al/SBA-15 showing NO conversion of ∼88% at 400 °C.
