Two CeO₂ catalysts were fabricated by dry ball milling in the absence or presence of organic ligand, denoted as CeO₂‐A and CeO₂‐B, respectively, and tested for selective catalytic reduction of NO by NH₃ (NH₃‐SCR). It was found that the CeO₂‐B catalyst exhibited high NH₃‐SCR activities as well as high SO₂ and H₂O resistance. The characterizations of nitrogen adsorption (BET), X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), Raman spectroscopy, temperature‐programmed reduction (H₂‐TPR), temperature‐programmed desorption (SO₂‐TPD) and X‐ray photoelectron spectroscopy (XPS) revealed that the addition of adipic acid in the synthetic procedure leaded to a high reducibility of cerium species and a special surface microstructure, including relative high surface defects and hierarchical pore structure of the CeO₂ catalyst, which played important roles in enhancing NH₃‐SCR performance. Meanwhile, the interaction between SO₂ and CeO₂ under different condition was investigated in detail by in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) and SO₂‐TPD. The data suggested that the high resistance to SO₂ poisoning of CeO₂‐B could be explained by a low amount of sulfur species formation and a low speed transformation of sulfites to sulfates on the ceria catalyst due to its special surface microstructure.

中文翻译：

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有机配体对二氧化铈催化NH3选择性还原NO的性能的促进作用

在不存在或存在有机配体的情况下，通过干式球磨法制备了两种CeO ₂催化剂，分别表示为CeO ₂ -A和CeO ₂ -B，并测试了通过NH ₃（NH ₃ -SCR）选择性催化还原NO的性能。。发现CeO ₂ -B催化剂表现出高的NH ₃ -SCR活性以及高的SO ₂和H ₂ O耐受性。氮吸附（BET），X射线衍射（XRD），傅立叶变换红外光谱（FTIR），热重分析（TG），拉曼光谱，温度程序还原（H ₂ -TPR），温度程序解吸（所以₂ -TPD）和X射线光电子能谱（XPS）显示，在合成过程中添加己二酸会导致铈物种的高还原性和特殊的表面微观结构，包括相对较高的表面缺陷和CeO的分级孔结构₂催化剂，在提高NH ₃ SCR性能方面发挥了重要作用。同时，通过原位漫反射红外傅里叶变换光谱（DRIFTS）和SO ₂ -TPD技术，详细研究了SO ₂与CeO ₂在不同条件下的相互作用。数据表明CeO ₂对SO ₂中毒具有较高的抵抗力‐B可以解释为由于其特殊的表面微观结构，在二氧化铈催化剂上形成的硫种类少，亚硫酸盐转化为硫酸盐的速度低。