The study of thiophene adsorption onto La(III)-exchanged zeolite NaY by FT-IR spectroscopy

Tian, Fuping; Wu, Weicheng; Jiang, Zongxuan; Liang, Changhai; Yang, Yongxing; Ying, Pinliang; Sun, Xiaoning; Cai, Tonghui; Li, Can

doi:10.1016/j.jcis.2006.05.017

Cited by 72 publications

(43 citation statements)

References 26 publications

(72 reference statements)

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“…In crystalline and liquid thiophene, a slight shift to lower frequencies (with respect to gas phase) was observed due also to the weakness of intermolecular interactions. In thiophene adsorbed on zeolites this interaction is stronger and a lower-frequency shift in this mode was observed experimentally upon adsorption (from 1,408 to 1,396 cm -1 ) [7]. The d(CH) modes occur at slightly lower frequencies (1,074-1,067 cm -1 ) than in the gas phase (1,085-1,084 cm -1 ), as also observed in thiophene in the solid state [41].…”

Section: Spectroscopic Propertiesmentioning

confidence: 69%

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Molecular structure and spectroscopic properties of polyaromatic heterocycles by first principle calculations: spectroscopic shifts with the adsorption of thiophene on phyllosilicate surface

2009

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The molecular and electronic structure and spectroscopic properties of thiophene, benzothiophene, and dibenzothiophene molecules have been studied theoretically, using different levels of quantum-mechanical calculations based on Hartree-Fock and density functional theory (DFT) approximations. In all calculation levels used, the molecular structures, dipole moments, thermodynamic properties, and vibration normal modes agree well with the available experimental data and predict the nonavailable values. The calculated frequencies agree with experimental values within scale factors in the range of 0.94-1.0 for thiophene. Our calculations have refined the mode assignments previously reported. The adsorption of thiophene on a pyrophyllite surface along the 001 plane was also investigated by means of a quantum-mechanical method based on the DFT approximation in a periodical crystal lattice model. The adsorbed thiophene adopts a parallel orientation with respect to the phyllosilicate surface. The shifts observed experimentally in the IR bands of thiophene upon adsorption on pyrophyllite are well reproduced in the thiophene-phyllosilicate complex, finding explanations of this phenomenon and new effects with our calculations.

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Section: Spectroscopic Propertiesmentioning

confidence: 69%

“…Previous authors have reported some variations in the IR spectra of thiophene [4,7,8] when they are adsorbed on silica, zeolite, and clay [9] surfaces.…”

Section: Introductionmentioning

confidence: 99%

Molecular structure and spectroscopic properties of polyaromatic heterocycles by first principle calculations: spectroscopic shifts with the adsorption of thiophene on phyllosilicate surface

2009

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“…Zeolites are excellent adsorbent materials [16]. The adsorption on zeolites can be described as physical adsorption [17].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of organosulphur compounds adsorption onto Jordanian zeolitic tuff from diesel fuel

Mustafa¹,

Al-Ghouti²,

Khalili³

et al. 2010

Journal of Hazardous Materials

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“…When combined with other metal ions, rare-earth ions can display unexpected functional properties [1][2][3][4].…”

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confidence: 99%

Effect of Modification of Cu+-13X Zeolite by Lanthanum on Dynamic Competitive Adsorption of 3-Methylthiophene and Benzothiophene

Tong

Zexiao

et al. 2013

Chem Technol Fuels Oils

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The zeolite sorbents Cu + -13X and La/Cu + -13X were prepared by the ion-exchange method. Dynamic adsorption of 3-methylthiophene and benzothiophene on fixed beds of the adsorbents was studied. It was found that introducing a rare-earth element into 13X zeolite increases its adsorption capacity and selectivity for sulfur compounds and reduces adsorption competition. The effect of the adsorbent bed height, feed rate, and liquid phase/adsorbent contact time was studied. The best results are obtained for adsorbent bed height 14 cm, feed rate 14 mL/h, and liquid phase/adsorbent contact time 30 minutes.Rare-earth elements have a special 4f electron shell configuration and a large atomic radius, very readily give up outer 6s electrons, and are characterized by some special physical and chemical properties. When combined with other metal ions, rare-earth ions can display unexpected functional properties [1][2][3][4].Although hydrodesulfurization is a major technology for removing sulfur compounds from fuels, it is a very complicated process to obtain ultra-low sulfur fuels. New technologies have been proposed for production of such fuels: adsorption desulfurization, biodesulfurization, extraction of sulfur compounds by ionic liquids, desulfurization by complex formation [5][6][7][8]. References 9 and 10 report on an efficient and environmentally friendly technology for deep desulfurization of fuels for fuel cells.Adsorption desulfurization on zeolites is widely studied, but when the large molecules of sulfur compounds participate in adsorption, zeolites are ineffective due to their small cage size. The authors of [11][12][13] introduced La 3+ ions into the zeolite. On the one hand, the binding strength between aluminum and oxygen atoms is increased, so more aluminum and consequently more acid sites are retained in the zeolite. On the other hand, the La 3+ ions increase the proton number, create additional acid sites, prevent loss of aluminum, and improve the stability and catalytic activity of the zeolite.

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The study of thiophene adsorption onto La(III)-exchanged zeolite NaY by FT-IR spectroscopy

Cited by 72 publications

References 26 publications

Molecular structure and spectroscopic properties of polyaromatic heterocycles by first principle calculations: spectroscopic shifts with the adsorption of thiophene on phyllosilicate surface

Molecular structure and spectroscopic properties of polyaromatic heterocycles by first principle calculations: spectroscopic shifts with the adsorption of thiophene on phyllosilicate surface

Characteristics of organosulphur compounds adsorption onto Jordanian zeolitic tuff from diesel fuel

Effect of Modification of Cu+-13X Zeolite by Lanthanum on Dynamic Competitive Adsorption of 3-Methylthiophene and Benzothiophene

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