Abstract The performance over a series of iron-cerium-tungsten mixed oxide catalysts were investigated for selective catalytic reduction (SCR) of NOx with NH3. These catalysts were prepared through critic acid sol-gel process assisted by microwave irradiation, which is a sample, time-saving and economic method to obtain magnetic iron-based catalyst compared with the traditional hydrothermal treatment assistant critic acid sol-gel method. X-ray diffraction (XRD), N2 absorption-desorption, X-ray photoelectron spectroscopy (XPS), Temperature programmed reduction (H2-TPR) and Temperature programmed desorption (NH3-TPD) were used to characterize the catalysts. The results showed that the addition of both cerium oxide and tungsten oxide improved the NH3-SCR activity of magnetic iron oxide. Higher calcination temperature enhanced the high-temperature catalytic activity of Fe0.85Ce0.10W0.05Oz, although might decrease its low-temperature NH3-SCR activity. The concentration of the surface adsorbed oxygen and the total oxygen were improved after introducing both cerium oxide and tungsten oxide compared with the addition of one auxiliary. This also depressed the formation of γ-Fe2O3 and α-Fe2O3 crystallite in magnetic iron oxide, and enhanced the dispersion of active elements on its surface, thereby improved its NH3-SCR activity.

中文翻译：

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微波辐射辅助下的临界酸溶胶-凝胶法制备磁性铁-铈-钨混合氧化物球团用NH 3 选择性催化还原NO x

摘要 研究了一系列铁-铈-钨混合氧化物催化剂用于NH3 选择性催化还原(SCR) NOx 的性能。这些催化剂是通过微波辐射辅助的临界酸溶胶-凝胶法制备的，与传统的水热处理辅助临界酸溶胶-凝胶法相比，这是一种样品、省时、经济的获得磁性铁基催化剂的方法。X 射线衍射 (XRD)、N2 吸收-解吸、X 射线光电子能谱 (XPS)、程序升温还原 (H2-TPR) 和程序升温脱附 (NH3-TPD) 用于表征催化剂。结果表明，氧化铈和氧化钨的加入均提高了磁性氧化铁的NH3-SCR活性。较高的煅烧温度提高了 Fe0.85Ce0.10W0.05Oz 的高温催化活性，但可能会降低其低温 NH3-SCR 活性。与添加一种助剂相比，同时引入氧化铈和氧化钨后表面吸附氧浓度和总氧浓度均有所提高。这也抑制了磁性氧化铁中γ-Fe2O3和α-Fe2O3微晶的形成，增强了活性元素在其表面的分散，从而提高了其NH3​​-SCR活性。