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Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO2 Hybrid Aerogel
Journal of Chemical & Engineering Data ( IF 2.6 ) Pub Date : 2020-02-28 , DOI: 10.1021/acs.jced.9b01183 Feifan Chen 1 , Bo Zhang 1 , Luxia Yin 1 , Yongkang Lu 1 , Wanhui Gong 1 , Jianguang Gao 1 , Zekai Zhang 1 , Wensheng Ning 1
Journal of Chemical & Engineering Data ( IF 2.6 ) Pub Date : 2020-02-28 , DOI: 10.1021/acs.jced.9b01183 Feifan Chen 1 , Bo Zhang 1 , Luxia Yin 1 , Yongkang Lu 1 , Wanhui Gong 1 , Jianguang Gao 1 , Zekai Zhang 1 , Wensheng Ning 1
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Amine-modified SiO2 hybrid aerogel desulfurization adsorbents with varied Si/N molar ratios (SiO2-NH2-n) were prepared via the sol–gel method followed by the atmospheric drying technique. SiO2-NH2-n aerogels were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), in situ Fourier transform infrared (FT-IR), and N2 adsorption–desorption. The desulfurization performances of SiO2-NH2-n were studied by the batch and breakthrough adsorption experiments. SiO2-NH2-n exhibited an obvious improvement in adsorption capacity for thiophenics compared with SiO2 aerogel due to the hydrogen bonding between thiophenics and amino groups. Among them, SiO2-NH2-8 had the best performance, and the adsorption capacities for thiophene, benzothiophene, and dibenzothiophene were 6.8, 9.5, and 10.2 mg S/gads, respectively. No effect of toluene and cyclohexene on the adsorption of SiO2-NH2-8 for thiophene was observed. The equilibrium adsorption data of SiO2-NH2-8 for thiophene were well fitted by the Freundlich model, indicating that multilayer adsorption occurred on the heterogenetic surface of SiO2-NH2-8. The kinetic adsorption data of SiO2-NH2-8 for thiophene could correlate properly with the pseudo-second-order kinetic model, suggesting that the rate-controlling steps involve surface adsorption. The saturated SiO2-NH2-8 could be regenerated completely via heating at 393 K for 12 h, and the regenerated SiO2-NH2-8 afforded 100% breakthrough adsorption capacity for thiophene.
中文翻译：
胺改性的SiO 2混合气凝胶对模型汽油的高选择性深度脱硫
通过溶胶-凝胶法，然后采用大气干燥技术，制备了具有不同Si / N摩尔比（SiO 2 -NH 2 - n）的胺改性SiO 2混合气凝胶脱硫吸附剂。SiO 2 -NH 2 - n气凝胶的特征在于X射线衍射（XRD），X射线光电子能谱（XPS），扫描电子显微镜（SEM），原位傅立叶变换红外光谱（FT-IR）和N 2吸附-解吸。二氧化硅的脱硫性能2 -NH 2 - ñ是由一批和突破吸附实验研究。SiO 2 -NH由于噻吩与氨基之间的氢键作用，2 - n与SiO 2气凝胶相比对噻吩的吸附能力有明显提高。其中，SiO 2 -NH 2 -8性能最好，对噻吩，苯并噻吩和二苯并噻吩的吸附容量分别为6.8、9.5和10.2 mg S / g ad。没有观察到甲苯和环己烯对SiO 2 -NH 2 -8吸附噻吩的影响。SiO 2 -NH 2的平衡吸附数据噻吩的-8符合Freundlich模型，表明SiO 2 -NH 2 -8的非均相表面发生了多层吸附。SiO 2 -NH 2 -8对噻吩的动力学吸附数据可以与拟二级动力学模型正确相关，表明速率控制步骤涉及表面吸附。饱和的SiO 2 -NH 2 -8通过在393 K下加热12 h可以完全再生，再生的SiO 2 -NH 2 -8具有100％的噻吩穿透吸附能力。
更新日期：2020-02-28
中文翻译：
胺改性的SiO 2混合气凝胶对模型汽油的高选择性深度脱硫
通过溶胶-凝胶法，然后采用大气干燥技术，制备了具有不同Si / N摩尔比（SiO 2 -NH 2 - n）的胺改性SiO 2混合气凝胶脱硫吸附剂。SiO 2 -NH 2 - n气凝胶的特征在于X射线衍射（XRD），X射线光电子能谱（XPS），扫描电子显微镜（SEM），原位傅立叶变换红外光谱（FT-IR）和N 2吸附-解吸。二氧化硅的脱硫性能2 -NH 2 - ñ是由一批和突破吸附实验研究。SiO 2 -NH由于噻吩与氨基之间的氢键作用，2 - n与SiO 2气凝胶相比对噻吩的吸附能力有明显提高。其中，SiO 2 -NH 2 -8性能最好，对噻吩，苯并噻吩和二苯并噻吩的吸附容量分别为6.8、9.5和10.2 mg S / g ad。没有观察到甲苯和环己烯对SiO 2 -NH 2 -8吸附噻吩的影响。SiO 2 -NH 2的平衡吸附数据噻吩的-8符合Freundlich模型，表明SiO 2 -NH 2 -8的非均相表面发生了多层吸附。SiO 2 -NH 2 -8对噻吩的动力学吸附数据可以与拟二级动力学模型正确相关，表明速率控制步骤涉及表面吸附。饱和的SiO 2 -NH 2 -8通过在393 K下加热12 h可以完全再生，再生的SiO 2 -NH 2 -8具有100％的噻吩穿透吸附能力。
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