Ag₂O/SiO₂–TiO₂-n aerogel composites with different molar ratios of Si/Ti, prepared by a sol–gel method followed by the ambient pressure drying technique, were used for the adsorptive removal of thiophenic compounds from model fuels, along with Ag₂O/SiO₂-50. The physicochemical properties of aerogel composites were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) spectroscopy, Brunauer–Emmett–Teller (BET) method, Fourier transform infrared (FT-IR) spectroscopy, NH₃ temperature-programmed desorption (TPD), and pyridine (Py) FT-IR spectroscopy. The results indicated that doping Ti into Ag₂O/SiO₂-50 led to a slight decrease in the specific surface area, an obvious increase in the actual content of Ag, and the appearance of weak Lewis acid centers on the surface. The data for equilibrium adsorption of thiophene over Ag₂O/SiO₂-50 and Ag₂O/SiO₂–TiO₂-50 were well fitted to the Langmuir and Freundlich isotherm equations. The kinetic experimental data of Ag₂O/SiO₂–TiO₂-50 was well fitted by a pseudo-second-order model. For two adsorbents, negative values of ΔG indicated that the adsorption processes were spontaneous. The adsorption process on Ag₂O/SiO₂–TiO₂-50 was more favorable at higher temperatures, which was contrary to that on Ag₂O/SiO₂-50. The incorporation of Ti into Ag₂O/SiO₂-50 can improve the adsorptive desulfurization performance owing to the increase in the actual content of Ag species (π-complexation centers), and thiophenic compounds can be adsorbed via Lewis acid–base interaction and S–Ti binding besides π-complexation. Among Ag₂O/SiO₂–TiO₂-n, Ag₂O/SiO₂–TiO₂-50 performed the best.

中文翻译：

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双金属Ag，Ti掺杂SiO ₂气凝胶复合材料对模型燃料中噻吩化合物的高吸附性能

通过溶胶-凝胶法和常压干燥技术制备的具有不同摩尔比的Si / Ti的Ag ₂ O / SiO ₂ -TiO ₂ -n气凝胶复合材料用于吸附去除模型燃料中的噻吩化合物，以及Ag ₂ O / SiO ₂ -50。气凝胶复合材料的物理化学性质通过X射线衍射（XRD），X-射线荧光（XRF）光谱法，布鲁诺-埃梅特-特勒（BET）法，傅里叶变换红外（FT-IR）光谱法，NH ₃与温度程序解吸（TPD）和吡啶（Py）FT-IR光谱。结果表明，将Ti掺杂到Ag ₂ O / SiO _2中-50导致比表面积略有减小，Ag的实际含量明显增加，并且表面上出现弱的路易斯酸中心。Ag ₂ O / SiO ₂ -50和Ag ₂ O / SiO ₂ -TiO ₂ -50上噻吩的平衡吸附数据很好地拟合了Langmuir和Freundlich等温方程。用伪二阶模型很好地拟合了Ag ₂ O / SiO ₂ -TiO ₂ -50的动力学实验数据。对于两种吸附剂，ΔG的负值表示吸附过程是自发的。Ag ₂ O / SiO ₂的吸附过程-TiO ₂ -50在较高温度下更有利，这与在Ag ₂ O / SiO ₂ -50上相反。由于Ag的实际含量（π络合中心）的增加，将Ti掺入Ag ₂ O / SiO ₂ -50可以提高吸附脱硫性能，并且噻吩化合物可以通过路易斯酸碱相互作用吸附。除π络合物外，还存在S-Ti结合。中的Ag ₂ O /二氧化硅₂ -TiO ₂ - Ñ，银₂ O /二氧化硅₂ -TiO ₂ -50进行最好的。