Adsorption of carbon dioxide, ethane, and methane on titanosilicate type molecular sieves

Ansón, Alejandro; Lin, Chih-Lung; Kuznicki, Steven M.; Sawada, James A.

doi:10.1016/j.ces.2009.05.024

Cited by 70 publications

(37 citation statements)

References 11 publications

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“…The CO 2 adsorption capacity of UZAR-S2 is about five times higher than that of original AM-4, because the delaminated product has a higher specific surface area available than the layered precursor. Although the maximum capacity of UZAR-S2 is lower than the value of 2 mmol CO 2 / g obtained for the microporous titanosilicate ETS-10, [33] which possesses an important internal surface area as well as a larger pore volume, the maximum capacity is in the same range as that of Ti-umbite (about 0.2 mmol CO 2 /g). [34] Figure 10.…”

Section: Samplementioning

confidence: 89%

Synthesis, Swelling, and Exfoliation of Microporous Lamellar Titanosilicate AM‐4

et al. 2011

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AM‐4 is a layered porous titanosilicate built from TiO6 and SiO4 polyhedra. An improved synthesis of AM‐4 crystalsenabling control of particle size by secondary growth and reducing synthesis time is presented. A new material, UZAR‐S2, has been obtained by exfoliation of the smaller AM‐4. The exfoliation consists of proton exchange with acetic acid, intercalation with nonylamine, and final activation by washing with HCl/water/ethanol. Besides XRD, TEM, N2 adsorption, FTIR, and UV/Vis characterization highlighting the delaminated character of UZAR‐S2, CO2 adsorption was also measured.

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Section: Samplementioning

confidence: 89%

Synthesis, Swelling, and Exfoliation of Microporous Lamellar Titanosilicate AM‐4

et al. 2011

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“…Previous experimental adsorption [13,15,19] and vibrational [42,43] studies disclosed that the Na2 cations, which are less coordinated than cations of the type Na1, Na3, and Na4, would be the primary sites for interaction with guest molecules in the 12-MR channels of ETS-10, with concomitant formation of sorbate-Na adducts [21] or -complexes [22], depending on the adsorbate. The experimental isosteric heats for methane adsorption in ETS-10 reported in the literature are included in the interval from -20.8 to -23.3 kJ·mol -1 , and were deduced from the fit of Toth, unilan or virial three constants models to the adsorption data obtained with volumetric systems in temperature ranges around T=298.15 K [18,41].…”

Section: Resultsmentioning

confidence: 99%

“…In fact, AlBaghli et al [15] and Anson et al [16]suggested ETS-10 as an adsorbent for hydrocarbon separation processes. Furthermore, Al-Baghli et al [18]reported adsorption isotherms and isosteric heats of adsorption for methane, ethane and ethene in ETS-10, Anson et al [19]used ETS-10 for ethene separation from ethane by an adsorptive separation technique, while Avila et al [20] evidenced the better capability of ETS-10 to separate ethane from a methane/ethane mixture.…”

Section: Introductionmentioning

confidence: 99%

A density functional theory study on the interaction of paraffins, olefins, and acetylenes with Na-ETS-10

2015

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High demand for economically viable separation processes like adsorptive separation for mixtures of hydrocarbons drives the need for understanding the interaction of hydrocarbons with titanosilicate adsorbents, to replace the energy intensive cryogenic hydrocarbon separation.Density functional theory (DFT) was used to optimize the geometries and calculate the enthalpies for the interactions between paraffins (C 2 H 6 , C 3 H 8 ), olefins (C 2 H 4 , C 3 H 6 ) and acetylenes (C 2 H 2 , C 3 H 4 ) with a cluster model of the Engelhard titanosilicatehaving sodium extra framework cations (Na-ETS-10). The DFT calculations were performed with theM06-L exchange correlation functional and were corrected for the basis set superposition error with the counterpoise method. The calculated enthalpies for the interaction of hydrocarbons with Na-ETS-10 decrease with the decrease in the number of carbon atoms, in the order acetylenes >olefins >paraffins,and compare well with experimental data available in the literature. The enthalpies calculated at the M06-L/6-31++G** level of theory for the two extreme cases, i.e., strongest and weakest interactions, are -62.8 kJ·mol -1 (C 3 H 4 ) and -26.9 kJ·mol -1 (C 2 H 6 ).Additionally, the calculated vibrational frequencies are in good agreement with the characteristic vibrational modes of ETS-10 and of the interactions of hydrocarbons with Na + in the 12-membered channel in ETS-10.

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“…These target different applications, such as ion exchange [20][21][22][23][24], adsorption [25][26][27][28], membrane separation [29][30][31][32], pillaring templating [33,34] and oxidation catalysis [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Optimization of mesoporous titanosilicate catalysts for cyclohexene epoxidation via statistically guided synthesis

et al. 2018

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An efficient approach to improve the catalytic activity of titanosilicates is introduced. The Doehlert matrix (DM) statistical model was utilized to probe the synthetic parameters of mesoporous titanosilicate microspheres (MTSM), in order to increase their catalytic activity with a minimal number of experiments. Synthesis optimization was carried out by varying two parameters simultaneously: homogenizing temperature and surfactant weight. Thirteen different MTSM samples were synthesized in two sequential 'matrices' according to Doehlert conditions and were used to catalyse the epoxidation of cyclohexene with tert-butyl hydroperoxide. The samples (and the corresponding synthesis conditions) with superior catalytic activity in terms of product yield and selectivity were identified. In addition, this approach revealed the limiting values of each synthesis parameter, beyond which the material becomes catalytically ineffective. This study demonstrates that the DM approach can be broadly used as a powerful and time-efficient tool for investigating the optimal synthesis conditions of heterogeneous catalysts. Abbreviation

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Adsorption of carbon dioxide, ethane, and methane on titanosilicate type molecular sieves

Cited by 70 publications

References 11 publications

Synthesis, Swelling, and Exfoliation of Microporous Lamellar Titanosilicate AM‐4

Synthesis, Swelling, and Exfoliation of Microporous Lamellar Titanosilicate AM‐4

A density functional theory study on the interaction of paraffins, olefins, and acetylenes with Na-ETS-10

Optimization of mesoporous titanosilicate catalysts for cyclohexene epoxidation via statistically guided synthesis

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