Effect of Calcination Temperature on the SCR Activity of Fe–S/TiO2 Catalysts
A series of Fe–S/TiO2 catalysts were prepared at different calcination temperatures by impregnation method and its performance of selective catalytic reduction (SCR) of NO with NH3 was investigated at temperatures ranging from 200 to 400 °C. Fe–S/TiO2-300 °C catalyst showed the highest activity, the NO conversion reaching over 80% in the range of 280–400 °C. With the help of XRD, H2-TPR and NH3-TPD, the structures and properties of catalysts were characterized. With the increase of calcination temperature, the Fe(OH)SO4 content in the catalyst decreased gradually. In addition, When the calcination temperature was below 400 °C, the main crystal phase in the catalyst is Fe(OH)SO4 and FeSO4. However, when it was 500 °C, the crystal phase of the active material became Fe2(SO4)3 and FeSO4. What’s more, the reduction ability of several catalysts showed no much difference, but the surface acidity was quite different, as the acidity of the Fe–S/TiO2-300 °C catalyst was the strongest.
KeywordsNH3-SCR Fe–S/TiO2 catalysts Calcination temperature
This work was financially supported by “the Fundamental Research Funds for the Central Universities” (2017-YB-012). And the tests of XRD were supported by Research and Test Center of Materials, Wuhan University of Technology. H2-TPR and NH3-TPD tests were supported by State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology.
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