A series of Mn/TiO2 catalysts were prepared using different dosage of cetyl trimethyl ammonium bromide (CTAB) and polyethylene glycol (PEG) 600 as surfactants by sol–gel method. When CTAB/Ti and PEG/Ti were 0.075 and 0.13, the morphology of the catalysts exhibited nano rod and regular sphere structure, respectively, and the activity was also the highest. The superior SCR activity of NC(0.075)-Mn/TiO2 and NP(0.13)-Mn/TiO2 catalysts was mainly due to the larger surface area and stronger reduction ability. In addition, it was found that the SCR activity of the catalysts with PEG600 as surfactants was generally higher than that of CTAB as surfactants, which may be due to its advantages in specific surface area, crystallinity, acidity, surface ion and chemisorbed oxygen concentration, and reducibility.
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This work was financially supported by “the Fundamental Research Funds for the Central Universities” (2017-YB-012). And the tests of XRD, SEM and XPS were supported by Research and Test Center of Materials, Wuhan University of Technology. TG, H2-TPR and NH3-TPD tests were supported by State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology.