Preparation of quasi-MIL-101(Cr) loaded ceria catalysts for the selective catalytic reduction of NO_x at low temperature

At present, the development of novel catalysts with high activity Selective Catalytic Reduction (SCR) reaction at the low temperature is still a challenge. In this work, the authors prepare CeO₂/quasi-MIL-101 catalysts with various amounts of deposited ceria by a double-solvent method, which are characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and so on. The results show that the increase of Ce content has a great influence on the catalytic property of the catalyst. The introduction of Ce can promote the conversion between Cr³⁺ and Cr⁵⁺ and increase the proportion of lattice oxygen, which improves the activity of the catalyst. However, the catalyst will be peroxidized when the content of Ce is too high, resulting in the decline of the catalytic activity. This experiment indicates that CeO₂/quasi-MIL-101 plays a significant role in the NH₃-SCR process at the low temperature when the loading of Ce is 0.5%. This work has proved the potential of this kind of material in NH₃-SCR process at the low temperature, providing help for subsequent studies.