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TiO2-modified CeVO4 catalyst for the selective catalytic reduction of NOx with NH3

机译：TiO2修饰的CEVO4催化剂，用于NOX选择性催化降低NH3

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摘要

A series of TiO2-modified CeVO4 catalysts were prepared by the homogeneous precipitation method, among which the CeVTi5 catalyst showed the best low-temperature NH3-selective catalytic reduction (NH3-SCR) activity at high GHSV. The CeVTi5 catalyst also exhibited good H2O and SO2 durability. These catalysts were characterized by XRD, BET, Raman spectroscopy, H-2-TPR, XPS, and NH3-TPD. The introduction of TiO2 into CeVO4 decreased the crystallite size, increased the surface area and the number of acid sites, and promoted the dispersion of active Ce and V species, leading to enhancement of the redox ability and interactions among Ce, V, and Ti, all of which favor the NH3-SCR reaction. According to in situ DRIFTS results, modification with TiO2 increased the number of Lewis acid sites and promoted the adsorption of NOx. The NH3-SCR reaction over the CeVTi5 catalyst followed both the Langmuir-Hinshelwood and Eley-Rideal mechanisms, while only the Eley-Rideal mechanism was observed on the CeVO4 catalyst.
机译：通过均质沉淀法制备了一系列TiO2修饰的CEVO4催化剂，其中CEVTI5催化剂在高GHSV上显示出最佳的低温NH3选择性催化还原（NH3-SCR）活性。 CEVTI5催化剂也表现出良好的H2O和SO2耐用性。这些催化剂的特征是XRD，BET，拉曼光谱，H-2-TPR，XPS和NH3-TPD。 The introduction of TiO2 into CeVO4 decreased the crystallite size, increased the surface area and the number of acid sites, and promoted the dispersion of active Ce and V species, leading to enhancement of the redox ability and interactions among Ce, V, and Ti,所有这些都有利于NH3-SCR反应。根据原位漂移结果，TiO2的修饰增加了路易斯酸位点的数量，并促进了NOX的吸附。 CEVTI5催化剂上的NH3-SCR反应遵循Langmuir-Hinshelwood和Eley-Rideal机制，而仅在CEVO4催化剂上观察到ELEY-RIDEAL机制。

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