期刊
RSC ADVANCES
卷 4, 期 49, 页码 25540-25551出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra02824d
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资金
- National Twelfth Five-Year Plan for Science & Technology Support of China [2011BAE29B02]
- Research and Test Center of Materials, Wuhan University of Technology
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology
- Laboratory of Living Materials, Wuhan University of Technology
Using the impregnation method, a series of Cu-Mn oxide catalysts were prepared and investigated for the selective catalytic reduction (SCR) of NOx with NH3 at temperatures ranging from 353 K to 453 K. The 0.05Cu-MnOx/TiO2 catalyst shows the highest activity and yields nearly 100% NOx conversion at 453 K using GHSV 40 000 h(-1), while the 0.20Cu-MnOx/TiO2 catalyst exhibits a certain level of potassium tolerance. In addition, the catalysts show favorable stability and water resistance. According to the XRD, EDS and SCR performance results, the existence of a new crystallized CuMn2O4 spinel phase is the dominant parameter for outstanding SCR activity between 413 K and 453 K. TPR, XPS and in situ DRIFT experiments indicate that CuMn2O4 is responsible for low reduction temperature, strong interaction between manganese oxides and copper oxides, high Mn3+ content and numerous acid sites on the surface. Compared with MnOx/TiO2 catalysts, Cu-Mn oxide catalysts could reduce the poisoning effect of potassium, illustrating that the CuMn2O4 phase may play a significant role in K-tolerance. Meanwhile, based on a certain level of potassium tolerance in CuMn2O4, an oxidation mechanism for NO is proposed due to the increase in Mn3+ and the special structure of a spinel oxide.
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