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.

中文翻译：

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制备用于低温选择性催化还原 NOx 的准 MIL-101(Cr) 负载氧化铈催化剂

目前，在低温下开发具有高活性选择性催化还原（SCR）反应的新型催化剂仍然是一个挑战。在这项工作中，作者通过双溶剂法制备了具有不同量沉积二氧化铈的 CeO2/quasi-MIL-101 催化剂，其特征在于 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FT-IR)、透射电子显微镜 (TEM)、X 射线光电子能谱 (XPS) 等。结果表明，Ce含量的增加对催化剂的催化性能有很大影响。Ce的引入可以促进Cr3+和Cr5+之间的转化，增加晶格氧的比例，提高了催化剂的活性。但Ce含量过高时，催化剂会过氧化，导致催化活性下降。本实验表明，当Ce负载量为0.5%时，CeO2/quasi-MIL-101在低温NH3-SCR过程中发挥了重要作用。该工作证明了该材料在低温NH3-SCR过程中的潜力，为后续研究提供了帮助。