The Potential Theory of Adsorption of Gases and Vapors for Adsorbents with Energetically Nonuniform Surfaces.

Dubinin, M. M.

doi:10.1021/cr60204a006

Cited by 2,064 publications

(856 citation statements)

References 3 publications

(7 reference statements)

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“…The method to calculate BET surface areas was consistent with the BS ISO 9277:2010, which uses the consistency criteria reported by Rouquerol [30,31]. To obtain the microporous and total pore volume of the materials, Dubinin-Radushkevich (DR) and Horvath-Kawazoe (HK) methodologies were used [32,33]. All these values were obtained using the MicroActive V 1.01 software supplied by Micromeritics.…”

Section: Methodsmentioning

confidence: 99%

Structure–property relationships in metal-organic frameworks for hydrogen storage

Noguera-Díaz

Bimbo

Holyfield

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Experimental hydrogen isotherms on several metal-organic frameworks (IRMOF-1, IRMOF-3, IRMOF-9, ZIF-7, ZIF-8, ZIF-9, ZIF-11, ZIF-12, ZIF-CoNIm, MIL-101 (Cr), NH2-MIL-101 (Cr), NH2-MIL-101 (Al), UiO-66, UiO-67 and HKUST-1) synthesized in-house and measured at 77 K and pressures up to 18 MPa are presented, along with N2 adsorption characterization. The experimental isotherms together with literature high pressure hydrogen data were analysed in order to search for relationships between structural properties of the materials and their hydrogen uptakes. The total hydrogen capacity of the materials was calculated from the excess adsorption assuming a constant density for the adsorbed hydrogen. The surface area, pore volumes and pore sizes of the materials were related to their maximum hydrogen excess and total hydrogen capacities. Results also show that ZIF-7 and ZIF-9 (SOD topology) have unusual hydrogen isotherm shapes at relatively low pressures, which is indicative of "breathing", a phase transition in which the pore space increases due to adsorption. This work presents novel correlations using the modelled total hydrogen capacities of several MOFs. These capacities are more practically relevant for energy storage applications than the measured excess hydrogen capacities. Thus, these structural correlations will be advantageous for the prediction of the properties a MOF will need in order to meet the US Department of Energy targets for the mass and volume capacities of on-board storage systems. Such design tools will allow hydrogen to be used as an energy vector for sustainable mobile applications such as transport, or for providing supplementary power to the grid in times of high demand.

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Section: Methodsmentioning

confidence: 99%

Structure–property relationships in metal-organic frameworks for hydrogen storage

Noguera-Díaz

Bimbo

Holyfield

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…We have further modified this method for N2 adsorption on silica . The t-plot method (Lippens and de Boer, 1965) and the Dubinin-Radushkevich (DR) method (Dubinin, 1960; eq 21, are used for the determination of the micropore volume:…”

Section: Methodsmentioning

confidence: 99%

“…[E is used in some limited cases for pore size assessment (Dubinin, 1960;de Lange et al, 1993de Lange et al, , 1995cSing et al, 1985). 1 The micropore volume is calculated directly from the isotherm, from the intercept of the straight line through the plateau with the adsorption axis.…”

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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“…For the determination of the micropore volume, we have selected the t-plot method, developed by de Boer and co-workers [13,14], and the DubininRadushkevich method [15], as has been described extensively elsewhere [12]. The DubininRadushkevich method is based on Eq.…”

Section: Introductionmentioning

confidence: 99%

Microstructural properties of non-supported microporous ceramic membrane top-layers obtained by the sol-gel process

Lange

Hekkink

Keizer

et al. 1996

Journal of Non-Crystalline Solids

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Dried and calcined non-supported membrane top-layers of SiO2, SiO2/TiO 2, SiO2/ZrO 2 (10, 20 and 30 mol% TiO 2 and ZrO 2, respectively) and SiO2/Al203 (10 mol% AIOt. 5) were prepared using acid catalyzed hydrolysis and condensation of alkoxides in ethanol. The microstructure was determined using nitrogen physisorption. The modified Horvfith-Kawazoe model for nitrogen adsorption in cylindrical pores was used for pore size assessment. SiO 2 non-supported membrane top layers were 100% microporous with an average porosity of 30-37%, depending on drying conditions. The bimodal pore size distribution shows a maximum at an effective pore diameter of 0.5 nm, and a broader tail with a weaker maximum around 0.75 nm. Microporous non-supported binary systems can be prepared with porosities between 15 and 40%. The high reactivity of the Ti, Zr, Al-alkoxides requires carefully chosen conditions. Too much water results in dense materials. The pore size distributions (PSDs) of the binary systems resemble the PSDs for silica.

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The Potential Theory of Adsorption of Gases and Vapors for Adsorbents with Energetically Nonuniform Surfaces.

Cited by 2,064 publications

References 3 publications

Structure–property relationships in metal-organic frameworks for hydrogen storage

Structure–property relationships in metal-organic frameworks for hydrogen storage

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

Microstructural properties of non-supported microporous ceramic membrane top-layers obtained by the sol-gel process

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