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Ce1-xMnxVO4 with Improved Activity for Low-Temperature Catalytic Reduction of NO with NH3
Li Wang1, Jun-Bo Wang2, He-Ping Cheng3
1College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou, 310015, China.
Abstract:
Novel Ce1-xMnxVO4 catalysts prepared via modified hydrothermal synthesis were used in selective catalytic reduction of NO using NH3 (NH3-SCR). The Ce1-xMnxVO4 catalysts displayed optimum NO removal efficiency at 250 °C. Physicochemical properties including crystal type, morphology, particle size, elemental composition, BET surface area, chemical bond, and valence state were studied by XRD, TEM, EDS, N2 adsorption-desorption, Raman spectroscopy, and XPS. Specific properties such as reduction property and acid sites were studied by H2-TPR and NH3-TPD. The in-situ DRIFTS results revealed that NH3-SCR over Ce0.5Mn0.5VO4 follows the Eley-Rideal mechanism. The experimental results showed that doped manganese replaces the Ce position in CeVO4. The Mn-O-Ce interaction may increase the contents of oxygen defects and Brønsted acid sites, thus leading to enhanced activity.
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