Cu₂O-SiO₂ composite aerogel-like adsorbents with different n(Si/Cu) were synthesized by a sol–gel method, followed by drying under atmospheric pressure, and characterized by BET, XRD, SEM, H₂-TPR, XRF, and FTIR means. Their adsorption performance for thiophene and benzothiophene in model fuels was investigated with equilibrium and breakthrough adsorption experiments, respectively. The results showed that Cu₂O-SiO₂ composite aerogel-like adsorbents exhibited an excellent desulfurization performance based on π-complexation between Cu(I) and thiophenics. The n(Si/Cu) of Cu₂O-SiO₂ had an obvious effect on their physical properties and consequently desulfurization performance. The BET surface area, pore size, and pore volume decreased with the decrease of n(Si/Cu) (increase of Cu content). Only a part of Cu was incorporated into the materials. The more the Cu(I) and the higher the specific surface area, the larger the adsorption capacity was. Cu₂O-SiO₂-50 performed the best, and breakthrough adsorption capacities for benzothiophene and thiophene were 5.78 mg S/g_ads (0.90 mmol-S/mmol-Cu) and 4.76 mg S/g_ads (0.74 mmol-S/mmol-Cu), respectively. The adsorption data can be well fitted by both the Langmuir and Freundlich adsorption isotherms. The effect of competitive adsorption of olefins or aromatics on the desulfurization performance of adsorbents was obviously weaker compared with the result in the literature. The spent Cu₂O-SiO₂ adsorbents can be well regenerated by benzene–n-heptane washing. The breakthrough adsorption capacity of thiophene on the first regenerated Cu₂O-SiO₂-50 was 71% of that on fresh adsorbent.

中文翻译：

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基于π络合物的Si / Cu摩尔比不同的新型Cu ₂ O-SiO ₂复合气凝胶状脱硫吸附剂

通过溶胶-凝胶法合成了不同n（Si / Cu）的Cu ₂ O-SiO ₂复合气凝胶状吸附剂，然后在大气压下干燥，并用BET，XRD，SEM，H ₂ -TPR，XRF表征和FTIR的意思。分别通过平衡吸附实验和突破吸附实验研究了它们在模型燃料中对噻吩和苯并噻吩的吸附性能。结果表明，Cu ₂ O-SiO ₂复合气凝胶状吸附剂表现出优异的脱硫性能，这是基于Cu（I）与噻吩之间的π络合作用。Cu ₂ O-SiO ₂的n（Si / Cu）对它们的物理性能和脱硫性能有明显的影响。BET表面积，孔径和孔体积随n（Si / Cu）的减少（Cu含量的增加）而降低。材料中仅掺入了一部分铜。Cu（I）越多，比表面积越大，吸附容量越大。Cu ₂ O-SiO ₂ -50表现最好，对苯并噻吩和噻吩的突破吸附容量为5.78 mg S / g_广告（0.90 mmol-S / mmol-Cu）和4.76 mg S / g_广告（0.74 mmol-S / mmol-Cu）。Langmuir和Freundlich吸附等温线均可很好地拟合吸附数据。与文献结果相比，竞争性吸附烯烃或芳烃对吸附剂脱硫性能的影响明显较弱。用过的Cu ₂ O-SiO ₂吸附剂可以通过苯正庚烷洗涤得到很好的再生。噻吩在第一个再生的Cu ₂ O-SiO ₂ -50上的突破吸附能力是新鲜吸附剂的71％。