Selective catalytic reduction of NOx by NH3 over CeVO4-CeO2 nanocomposite
2020
Duan, Chao-peng | Guo, Rui-tang | Wu, Gui-lin | Pan, Wei-guo
In this study, it was found that the CeVO₄-CeO₂ nanocomposite possessed remarkably selective catalytic reduction (SCR) performance and wider active temperature scope. And, the promotion principle was explored based on BET, XRD, XPS, H₂-temperature-programmed reduction, NH₃-temperature-programmed desorption, and in situ diffuse reflectance infrared Fourier transform (DRIFT) techniques. The characterization outcomes manifested that the CeVO₄-CeO₂ nanocomposite could inhibit its crystallinity and enhance the concentrations of chemisorbed oxygen species and Ce³⁺, which was advantageous to the SCR process. Moreover, the in situ DRIFT technique manifested that the NH₃-SCR reaction over Ce₀.₇₅V₀.₂₅Oy was enhanced effectively through the mechanism of L-H.
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