A simple, low energy consumption and environment-friendly strategy was used to prepare highly dispersed CeO/SiO aerogel composites with different molar ratio of Si/Ce via sol-gel method and subsequently drying under the ambient pressure, in which the oxidation of Ce species into Ce species could be achieved by adding HO. The structural and surface properties of adsorbents were analyzed by XPS, XRD, FT-IR, Py-IR, SEM, XRF and N adsorption-desorption isotherm. The adsorption desulfurization performances of CeO/SiO for thiophenic compounds from simulated gasoline and model aromatic products were investigated and compared by the breakthrough and batch adsorption experiments. As a result, the weak Lewis acid centers appeared on the surface of CeO/SiO. Among them, CeO/SiO with a Si/Ce of 25 performed best, the adsd by Duanpacity for TP from simulated gasoline (n-heptane) was 10.9 mg-S/g, followed by model aromatic products (benzene, 10.6 mg-S/g; p-xylene, 10.1 mg-S/g), however, the difference between them was slight, attributed to the formation of S-Ce bonding instead of C-Ce bonding. The very weak competitive adsorption of benzene and p-xylene with thiophene originated from the weak Lewis acid-base interaction. After the fourth solvent washing regeneration, the breakthrough adsorption capacity of regenerated CeO/SiO-25 still remained 60% of the fresh one. The equilibrium adsorption data of CeO/SiO-25 for thiophene were well fitted by Langmuir and Freundlich model, and the adsorption for TP was more favorable at the higher temperature. The adsorption process of CeO/SiO-25 was well fitted by pseudo-second-order kinetic model, which was spontaneous, endothermic and the freedom degree increased. The solvent (n-heptane, benzene, p-xylene) hardly influence the adsorption behavior of TP on CeO/SiO.

中文翻译：

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易于制备具有高吸附脱硫性能的高分散CeO2/SiO2气凝胶复合材料

采用简单、低能耗、环境友好的策略，通过溶胶-凝胶法制备了不同Si/Ce摩尔比的高分散CeO/SiO气凝胶复合材料，并随后在常压下干燥，其中Ce物种的氧化可以通过添加 H2O 来实现 Ce 形态。通过XPS、XRD、FT-IR、Py-IR、SEM、XRF和N吸附-脱附等温线分析了吸附剂的结构和表面性质。通过突破性和批量吸附实验，研究并比较了CeO/SiO对模拟汽油和模型芳烃产品中噻吩类化合物的吸附脱硫性能。结果，弱路易斯酸中心出现在CeO/SiO的表面。其中，Si/Ce为25的CeO/SiO表现最好，Duanpacity从模拟汽油（正庚烷）中提取TP的adsd为10.9 mg-S/g，其次是模型芳烃产品（苯，10.6 mg-S/g） /g；对二甲苯，10.1 mg-S/g），然而，它们之间的差异很小，归因于形成了 S-Ce 键而不是 C-Ce 键。苯和对二甲苯与噻吩的非常弱的竞争吸附源于弱路易斯酸碱相互作用。经过第四次溶剂洗涤再生后，再生后的CeO/SiO-25的突破吸附容量仍保持新鲜的60%。 CeO/SiO-25对噻吩的平衡吸附数据符合Langmuir和Freundlich模型，且温度越高，对TP的吸附越有利。 CeO/SiO-25的吸附过程符合准二级动力学模型，吸附过程为自发、吸热且自由度增大。溶剂（正庚烷、苯、对二甲苯）几乎不影响TP在CeO/SiO上的吸附行为。