New composite aerogel-like adsorbents for thiophene based on π-complexation

Pan, Feimiao; Zhang, Bo; Ding, Yuansheng; Wang, Le; Xie, Fang; Cai, Weihao; Liu, Shaobo; Zhou, Jinbing

doi:10.1016/j.seppur.2017.09.073

Cited by 27 publications

(18 citation statements)

References 32 publications

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“…Aerogels are three-dimensional (3D) network porous materials formed via the aggregation of interconnected nanometer particles, applied widely in adsorption fields because of the large surface area, high porosity, as well as adjustable framework structure. , Nowadays, aerogels are prepared via the sol–gel technique followed by various drying methods including freeze-drying, supercritical drying, and ambient drying methods. Among them, the ambient drying method is suitable for the scale production of aerogels because of the low equipment investment and easy operation. , In our previous studies, − NiO-SiO 2 , Cu 2 O-SiO 2 , Ag/SiO 2 -Al 2 O 3 , and Ag 2 O-SiO 2 aerogel adsorbents based on π-complexation showed good adsorption performance for thiophenics from model gasolines. Compared with Cu(I)Y and AgY microporous adsorbents, the three-dimensional mesoporous skeleton of aerogel adsorbents could effectively eliminate the filling effect of micropores, leading to a higher adsorption selectivity for thiophene (TP).…”

Section: Introductionmentioning

confidence: 97%

Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO₂ Hybrid Aerogel

et al. 2020

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Amine-modified SiO 2 hybrid aerogel desulfurization adsorbents with varied Si/N molar ratios (SiO 2 -NH 2 -n) were prepared via the sol−gel method followed by the atmospheric drying technique. SiO 2 -NH 2 -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 N 2 adsorption−desorption. The desulfurization performances of SiO 2 -NH 2 -n were studied by the batch and breakthrough adsorption experiments. SiO 2 -NH 2 -n exhibited an obvious improvement in adsorption capacity for thiophenics compared with SiO 2 aerogel due to the hydrogen bonding between thiophenics and amino groups. Among them, SiO 2 -NH 2 -8 had the best performance, and the adsorption capacities for thiophene, benzothiophene, and dibenzothiophene were 6.8, 9.5, and 10.2 mg S/g ads , respectively. No effect of toluene and cyclohexene on the adsorption of SiO 2 -NH 2 -8 for thiophene was observed. The equilibrium adsorption data of SiO 2 -NH 2 -8 for thiophene were well fitted by the Freundlich model, indicating that multilayer adsorption occurred on the heterogenetic surface of SiO 2 -NH 2 -8. The kinetic adsorption data of SiO 2 -NH 2 -8 for thiophene could correlate properly with the pseudo-second-order kinetic model, suggesting that the rate-controlling steps involve surface adsorption. The saturated SiO 2 -NH 2 -8 could be regenerated completely via heating at 393 K for 12 h, and the regenerated SiO 2 -NH 2 -8 afforded 100% breakthrough adsorption capacity for thiophene.

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Section: Introductionmentioning

confidence: 97%

Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO₂ Hybrid Aerogel

et al. 2020

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“…In recent years, aerogel with a three‐dimensional interconnected porous network, assembled by coherent nanoparticles or polymer molecules, 34 has been receiving considerable attention because of its high surface area and flexible porous structure, which endow this kind of material with abundant active sites and high adsorption rate for a variety of adsorption applications. SiO 2 aerogel with a uniform pore structure is the widely investigated material for adsorptive desulfurization in the past few years 35‐39 . However, it shows weak surface interactions with aromatic sulfur compounds, which greatly restrict its ADS performance.…”

Section: Introductionmentioning

confidence: 99%

High‐performance adsorptive desulfurization by ternary hybrid boron carbon nitride aerogel

et al. 2021

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Separation of aromatic organosulfur compounds is vital for upgrading the feed to clean fuel products, however, it remains a formidable challenge for the present adsorbents. Herein, a series of novel aerogel‐like boron carbon nitride (BCN) with three‐dimensional interconnected porous networks were fabricated via a hydrogel template and freeze‐casting strategy. The as‐prepared aerogel‐like BCN had a variable carbon content and a flexible size of graphene domain on its porous structure. The optimal BCN aerogel represents the top‐level of adsorptive desulfurization (ADS) capacity for aromatic organosulfur compounds (30.8 mg S/g adsorbent), strikingly higher than the state‐of‐the‐art aerogels adsorbents (17.1 mg S/g adsorbent) reported under similar conditions. A selective adsorption for dibenzothiophene in the presence of aromatic hydrocarbons, nitrogen compounds were also achieved on BCN aerogel. The adsorption isotherm and XPS measurement reveal heterogeneous adsorption on the BCN aerogel via π–π and Lewis acid–base interactions.

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“…Aerogels, , three-dimensional, porous network, structural materials formed by the mutual aggregation of nanoscale particles, had been widely explored to be applied in the field of adsorption because of the high specific surface area (500–1200 m 2 /g), high porosity (80–98%), nanopore pore size, and low-cost manufacturing. Our group − previously prepared NiO-SiO 2 , Ag/SiO 2 , Ag/SiO 2 –Al 2 O 3 , and Cu 2 O–SiO 2 aerogel composites by a sol–gel method at ambient temperature and atmosphere, which had excellent adsorption ability for thiophenic compounds in model fuels, attributed to the high dispersion and exposure of π-complexation centers such as Ni + , Ag + , and Cu + in the aerogel composites. Furthermore, compared with that of other types of mesoporous desulfurization adsorbents reported, the amount of thiophene adsorbed per unit active site of the aerogel-type adsorbents was clearly higher.…”

Section: Introductionmentioning

confidence: 99%

Pd/SiO₂ Aerogel Composite Adsorbents with High Desulfurization Performance

Zhang

Liu

et al. 2020

J. Chem. Eng. Data

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Pd/SiO2-n aerogel composites with different Si/Pd mole ratios (n(Si/Pd)) were synthesized by a sol–gel method followed by drying in the atmosphere to adsorb thiophenic compounds from model oils. For Pd/SiO2-n, doping Pd species in SiO2 aerogels led to the appearance of weak Lewis acidic sites on the surface. The adsorption capacity of Pd/SiO2-n was significantly higher than that of pure SiO2, owing to the π-complexation, S–M bonding, and acid–base interaction between Pd2+ and thiophenic compounds. Among them, the capacity of Pd/SiO2-318 was the highest, 4.76 mg S/gads (i.e., 9.37 μmol S/μmol Pd), which was obviously higher than that of sorbents reported such as Pd/activated carbon and Pd/Al2O3, based on the amount of thiophene adsorbed per unit active centers. In the presence of aromatics and olefins, the selectivity of Pd/SiO2 for thiophene was higher than that of Ag/SiO2 and Cu/SiO2 reported, attributed to the stronger S–Pd bonding than the S–Ag and S–Cu bonding. The equilibrium adsorption data of thiophene onto Pd/SiO2-318 were well simulated with the Langmuir and Freundlich models. Combined with thermodynamic results, it can be found that the low temperature was favorable for the adsorption of thiophene. Pd/SiO2 exhibited a good regeneration performance after solvent washing.

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New composite aerogel-like adsorbents for thiophene based on π-complexation

Cited by 27 publications

References 32 publications

Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO₂ Hybrid Aerogel

Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO₂ Hybrid Aerogel

High‐performance adsorptive desulfurization by ternary hybrid boron carbon nitride aerogel

Pd/SiO₂ Aerogel Composite Adsorbents with High Desulfurization Performance

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New composite aerogel-like adsorbents for thiophene based on π-complexation

Cited by 27 publications

References 32 publications

Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO2 Hybrid Aerogel

Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO2 Hybrid Aerogel

High‐performance adsorptive desulfurization by ternary hybrid boron carbon nitride aerogel

Pd/SiO2 Aerogel Composite Adsorbents with High Desulfurization Performance

Contact Info

Product

Resources

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Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO₂ Hybrid Aerogel

Highly Selective Deep Desulfurization of a Model Gasoline on Amine-Modified SiO₂ Hybrid Aerogel

Pd/SiO₂ Aerogel Composite Adsorbents with High Desulfurization Performance