Abstract
Constructing excellently SO2-resistence NH3-SCR catalyst is a challenge for achieving superior NOx removal efficiency at practical needs. In this work, the effect of sulfate modification on the performance of NH3-SCR on ordered mesoporous catalysts was carefully studied. The ordered mesoporous catalyst CeSnTiOx modified with copper sulfate with the weak-confined effect has been prepared successfully via vacuum impregnation. Interestingly, the NO removal efficiencies of CeSnTiOx modified with copper sulfate got greatly enhanced at 240 °C under the atmosphere of SO2, and the 5Cu-S/CeSnTiOx catalyst (5% loaded of copper sulfate) has shown excellent performance. A series of characterizations such as XRD, TEM, TG, Raman and in-situ DRIFTS of SO2 atmosphere were conducted to investigate the interactions on the catalyst surface of those reactant molecule. It was revealed that the copper sulfate-modified has realized the boost from double reaction sites (redox site and acid site) in the 5Cu-S/CeSnTiOx catalyst. The Cu-species can disturb the electron cycle of the catalyst and reduce the strong redox performance of Ce active site, which can inhibit the adsorption of SO2 effectively. Meanwhile, the S-species (from the SO42-) has changed the distribution of acid sites and the total acid content on the catalyst surface, which has realized the rapid SCR reaction. This work provides a facile but effective strategy for further design of highly efficient SO2-resistence SCR catalysts.
Published Version
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