Curvature and parametric sensitivity in models for adsorption in micropores

Saitô, Akira; Foley, Henry C.

doi:10.1002/aic.690370312

Cited by 483 publications

(288 citation statements)

References 20 publications

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“…The method developed by Horvath and Kawazoe (Horvath and Kawazoe, 1983) for pore-size assessment in microporous, slit-shaped carbon using C02, and modified by Saito and Foley (Saito and Foley, 1991) for cylindrical pore geometry was selected for the pore size analysis of the nonsupported membranes. We have further modified this method for N2 adsorption on silica .…”

Section: Methodsmentioning

confidence: 99%

Aging and Stability of Microporous Sol-Gel-Modified Ceramic Membranes

Lange¹,

Keizer²,

Burggraaf³

1995

Ind. Eng. Chem. Res.

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Aging experiments on microporous sol-gel-derived nonsupported Si02 membranes were performed. Microstructure characterization was performed using nitrogen physisorption. It is found that both chemical aging and thermal aging result in densification of the microstructure, without pore growth. The influence of aging on supported SiO2-modified membranes was investigated using gas permeation and separation experiments. As for the nonsupported materials, some densification takes place. This leads to lower permeation rates, but a strong positive effect was observed on the separation properties. This might be attributed to a decrease of the pore size. Separation factors ranging from 50 to 125 have been measured for H2/CH4 at temperatures in the order of 250 "C.

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Section: Methodsmentioning

confidence: 99%

Aging and Stability of Microporous Sol-Gel-Modified Ceramic Membranes

Lange¹,

Keizer²,

Burggraaf³

1995

Ind. Eng. Chem. Res.

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“…Interaction parameters for N2 adsorbate taken from [24] and aluminosilicate adsorbent from [25]. Filled black arrows indicate the relevant axis for each curve.…”

Section: Chemical and Physical Characterisation Of Powdersmentioning

confidence: 99%

“…Barrett-Joyner-Halenda (BJH) desorption pore size and volume analysis [23] were applied to determine the pore size distribution of the mesopores, while the Horvath-Kawazoe method [24] with Saito-Foley modification [25] was applied to determine the micropore distribution, with interaction parameters for N2 adsorbate taken from [24] and aluminosilicate adsorbent from [25].…”

Section: Characterisationmentioning

confidence: 99%

“…This can be particularly challenging due to the wide variation of chemical and physical characteristics exhibited by commercial geopolymer precursors where a range of chemical reactivity is observed, Postprint of a paper published in Powder Technology, 29(2016): [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Version of record is available at http://dx.doi.org/10.1016/j.powtec.2016.04.006 3 meaning it is often difficult to distinguish reactive from inert species.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

et al. 2016

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“…The micropores (r pore < 2.0 nm) and mesopores (2.0 nm 5 r pore < 50 nm) of the polymer-derived amorphous silica materials were characterized by the SF 30) and BJH 31) methods, respectively.…”

Section: Characterizationmentioning

confidence: 99%

Polymer-derived amorphous silica-based inorganic–organic hybrids having alkoxy groups: intermediates for synthesizing microporous amorphous silica materials

Sokri

Onishi

Mouline

et al. 2015

J. Ceram. Soc. Japan

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Alkoxy group-functionalized amorphous silica-based inorganic organic hybrid materials were designed through polymer precursor route, in order to develop a novel route for the fabrication of microporous amorphous silica-based materials. Commercial perhydropolysilazane (PHPS) was chemically modified with alcohols (R-OH, R = n-C 5 H 11 OH, n-C 10 H 21 OH) at a PHPS (Si basis) to ROH molar ratio of 4/1, and subsequently oxidized to afford alkoxy group-functionalized amorphous silica by exposure to aqueous ammonia vapours at room temperature. Then, the oxidized materials were heat-treated at 600°C in air. Nitrogen sorption analysis revealed that micropore volume of the amorphous silica increased upon alkoxy group-functionalization prior to the heat treatment. As a result, higher micropore volume of 0.204 cm 3 /g was achieved, with a specific surface area of 387 m 2 /g for the PHPS-derived amorphous silica chemically modified with n-C 10 H 21 OH at the Si/n-C 10 H 21 OH molar ratio of 2/1. The micropores evaluated by the SF method were in the size range of 0.43 to 1.6 nm, and the resulting micropore size distribution plot exhibited a peak at 0.43 nm. The in-situ formation of the microporosity was further studied by the simultaneous thermogravimetry-mass spectrometry analysis. The relationship between the number of carbon atoms in the alkoxy group, the evolution of gaseous species during the heat treatment and the resulting microporosity is discussed.

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Curvature and parametric sensitivity in models for adsorption in micropores

Cited by 483 publications

References 20 publications

Aging and Stability of Microporous Sol-Gel-Modified Ceramic Membranes

Aging and Stability of Microporous Sol-Gel-Modified Ceramic Membranes

Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

Polymer-derived amorphous silica-based inorganic–organic hybrids having alkoxy groups: intermediates for synthesizing microporous amorphous silica materials

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Curvature and parametric sensitivity in models for adsorption in micropores

Cited by 483 publications

References 20 publications

Aging and Stability of Microporous Sol-Gel-Modified Ceramic Membranes

Aging and Stability of Microporous Sol-Gel-Modified Ceramic Membranes

Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

Polymer-derived amorphous silica-based inorganic&ndash;organic hybrids having alkoxy groups: intermediates for synthesizing microporous amorphous silica materials

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Polymer-derived amorphous silica-based inorganic–organic hybrids having alkoxy groups: intermediates for synthesizing microporous amorphous silica materials