Thermodynamics and Kinetics Study of the Adsorption and Diffusion of p-Xylene in Silicalite-1

Meng, Xiuxia; Duan, Linhai; Wang, Qiang; Chung, Jong Shik; Song, Lijuan; Sun, Zhaolin

doi:10.1515/jnetdy.2009.002

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…A sensitive microbalance with resolution of 0.1 μg was mounted in a thermostatted enclosure to remove the thermal coefficients of the weighing system and thus provide higher stability and accuracy. 22 The selective adsorption/desulfurization performances of the sorbents were carried out using a static stirring method or a fixed-bed flow reactor. The static adsorption studies were conducted with a mass ratio of 14:1 of the model fuels and adsorbents in a flask with a magnetic stirrer at ambient temperature and pressure.…”

Section: Methodsmentioning

confidence: 99%

“…The adsorption isotherm measurements were made gravimetrically by a fully automated and computer-controlled gravimetric system (IGA, Hiden Analytical Ltd., Warrington, UK). A sensitive microbalance with resolution of 0.1 μg was mounted in a thermostatted enclosure to remove the thermal coefficients of the weighing system and thus provide higher stability and accuracy . The selective adsorption/desulfurization performances of the sorbents were carried out using a static stirring method or a fixed-bed flow reactor.…”

Section: Methodsmentioning

confidence: 99%

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Adsorption, Co-adsorption, and Reactions of Sulfur Compounds, Aromatics, Olefins over Ce-Exchanged Y Zeolite

et al. 2012

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Adsorption, coadsorption, and reactions of sulfur compounds, olefins, and aromatics over Ce-exchanged Y zeolite (CeY) have been studied by N2 adsorption, intelligent gravimetric analyzers (IGA), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), Fourier-transform infrared spectroscopy (FT-IR), frequency response (FR) techniques, and batch and fixed bed methods. The coadsorption of olefins can effectively contribute to the alkylation and oligomerization reactions of thiophene and further decrease the desulfurization performance of CeY. The influence of aromatics on the desulfurization performance of CeY can be related to the competitive adsorption/diffusion processes between sulfur compounds and aromatics. The diffusion process is the rate-controlling step for benzene, and the sorption process is the rate-controlling step for thiophene. Thiophene molecules can be preferentially adsorbed onto the Lewis acid sites by direct interaction between sulfur on sulfur compounds and the Ce ion (S–M bond formation) or π-complexation, but the S–M bond interactions play a more dominant role than π-complexation in the CeY/sulfur compounds system.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Adsorption, Co-adsorption, and Reactions of Sulfur Compounds, Aromatics, Olefins over Ce-Exchanged Y Zeolite

et al. 2012

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“…Furthermore, the adsorption dynamic and thermodynamic such as the activation energy and adsorption heat, which are helpful in understanding the diffusion process and the catalytic performance, are not available for hierarchically ZSM-5. Our group has studied the adsorption property of several samples in zeolites and corresponding research (Meng et al, 2009; Sui et al, 2013; Qin et al, 2014a,b).…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer Behavior of Benzene in Hierarchically Structured ZSM-5

et al. 2019

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A series of ZSM-5 zeolites with hierarchical porous structure were synthesized using NaOH solutions treatment method. The structural and acidity properties of hierarchical ZSM-5 zeolites as-synthesized were characterized by X-ray diffraction (XRD), N 2 adsorption, scanning electron microscope (SEM), NH 3 -temperature programmed desorption (TPD), and pyridine Fourier transform infrared spectroscopy (Py-FTIR). The adsorption and diffusion performances of benzene in hierarchical ZSM-5 zeolites were studied by an intelligent gravimetric analyzer (IGA). It was found that mass transfer (adsorption and diffusion) performance of benzene was significantly affected by synergetic effect of hierarchical structure, acid amount, acidity, adsorption sites of ZSM-5 zeolites. After suitable alkali treatment, the crystal structure of ZSM-5 was retained and finely tailored. Hierarchical ZSM-5 was obtained with a uniform size of mesoporous and microporous structure. Acidity of hierarchical ZSM-5 zeolites was improved, which produced more adsorption sites and thus increased the adsorption performance of benzene in hierarchical ZSM-5. As a result, connectivity in hierarchical ZSM-5 was improved with increasing of mesopores in hierarchical ZSM-5. Hierarchical ZSM-5 well-contributed to the adsorption performance of benzene on active sites and improved catalytic performance of hierarchical ZSM-5.

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Synthesis and xylene isomers adsorption of silicalite-1 crystals with intracrystalline mesopores aided by 3-glycidoxypropyl-trimethoxysilane and polyethene glycol

et al. 2021

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Thermodynamics and Kinetics Study of the Adsorption and Diffusion of p-Xylene in Silicalite-1

Cited by 5 publications

References 17 publications

Adsorption, Co-adsorption, and Reactions of Sulfur Compounds, Aromatics, Olefins over Ce-Exchanged Y Zeolite

Adsorption, Co-adsorption, and Reactions of Sulfur Compounds, Aromatics, Olefins over Ce-Exchanged Y Zeolite

Mass Transfer Behavior of Benzene in Hierarchically Structured ZSM-5

Synthesis and xylene isomers adsorption of silicalite-1 crystals with intracrystalline mesopores aided by 3-glycidoxypropyl-trimethoxysilane and polyethene glycol

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