The Adsorption–Desorption Hysteresis in Relation to Capillarity of Adsorbents.

Pierce, Conway; Smith, R. N.

doi:10.1021/j150480a006

Cited by 77 publications

(36 citation statements)

References 8 publications

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“…0.77 mm mg 01 sensitivity then was outgassed at 220ЊC for L(nm) Å 3.17 log(DS/S) / 3.92, [2] 10 h under a residual pressure õ 10 06 Torr (10 04 Pa) using a turbomolecular pump. A small amount (ca.…”

Section: Methodsmentioning

confidence: 99%

“…0.9 must the residual equilibrium pressure of methanol (0.004-0.23 be corrected by extrapolating the straight line around P/P 0 Torr) or benzene (0.005-0.040 Torr) at preadsorption using Å 0.8 in order to subtract the adsorption amounts in mesothe Tylan General capacitance diaphragm gauge CDLs, 1, pores in using Eq. [2]. 10, and 100 Torr full scale.…”

Section: Methodsmentioning

confidence: 99%

“…It is of interest to know if preadsorbed methanol mechanism of water vapor. The point to be noted was the can form adsorption sites such as the primary adsorption existence of the hysteresis loop in the micropore range, centers for the following water vapor adsorption and, at the which was not seen in the adsorption of ethyl chloride vapor, same time, if active carbon preadsorbed with methanol can as first pointed out by Pierce and Smith (2). Later, this be used as adsorbent for refrigeration using water vapor.…”

Section: Introductionmentioning

confidence: 94%

“…latter sites are called the secondery adsorption centers (2). The characteristic shape of adsorption isotherms, Type V, So far, it is considered that the oxygen complexes on the of water vapor on microporous carbons has attracted many carbon surface play an important role in the adsorption of researchers for decades in the interpretation of adsorption water vapor.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Water Vapor on Active Carbon Preadsorbed with Methanol and Benzene

Tsunoda

1997

Journal of Colloid and Interface Science

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adsorption of Water Vapor on Active Carbon Preadsorbed with Methanol and Benzene

Tsunoda

1997

Journal of Colloid and Interface Science

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“…Smith [139] and further developed by Dubinin and Serpinsky [140,141] illustrates the adsorption of water in carbon pores [144]. The initial H 2 O molecules adsorbed on these centres act as nuclei for the growth of H 2 O clusters due to hydrogen bonding [142,143], and H 2 O which has a very strong electrostatic intermolecular interactions compared to weak carbon-water dispersive interactions [145] grow into hydrogen-bonded clusters at primary active sites that are present on the carbon surface (surface groups) followed by the growth and coalescence of these clusters, leading to the bulk filling of the carbon pores [141,146,147].…”

Section: Water Adsorption In Carbon Materialsmentioning

confidence: 99%

Adsorption analysis of carbon dioxide, hydrocarbons and moisture on carbon

Abadi¹

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This thesis presents a fundamental investigation on the role of the structure of microporous silicon carbide-derived carbon (SiCDC) and its functionalisation in the adsorption equilibria and transport of gases. The SiCDCs with different particle size distributions were synthesized in our laboratory and characterized using a combination of techniques including scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Xray diffraction (XRD), helium pycnometry, thermogravimetric analyses (TGA), nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), Raman spectroscopy, and gas adsorption.Based on the characterisation results, a bidisperse pore structure model is proposed for the synthesized SiCDC to explain the kinetics. In the mathematical modelling of adsorption kinetics, the internal structure of SiCDC is assumed to have ultra-microporous grains with larger particle scale micropores forming the intergrain pathways. It is shown that CH 4 adsorption kinetics is governed by two distinct diffusional resistances, arising from slow grain scale diffusion in ultra-micropores and faster particle scale diffusion in large micropores. For CO 2 , it is found that the adsorption kinetics is strongly influenced by a barrier resistance at the grain surface where entry into the ultra-microporosity occurs. The uptake of CO 2 in the bidisperse pore structure of CDCs occurs through rapid diffusion in the large particle-scale micropores, in which a Henry law isotherm holds, and a combination of barrier resistance at the grain surface and diffusional resistance in the grain interior with a Langmuirian isotherm. It is shown that the grain scale activation energies are comparable with values for carbon molecular sieves, and consistent with values expected for the size range of the ultra-micropores, while the activation energies for transport in the larger particle scale micropores are comparable to those for conventional activated carbons.The experimental uptake-based data are compared with self-diffusivities obtained through equilibrium molecular dynamics (EMD) simulations using a realistic model of SiCDC developed by the hybrid reverse Monte Carlo (HRMC) method. It is observed that MD-based CO 2 diffusivities are as much as two orders of magnitude larger than the CO 2 particle scale diffusion coefficients, however such discrepancy is not found for The findings of this thesis should aid better understanding of the gas adsorption and diffusion mechanism in microporous CDCs.iv

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Application of thin films to porous mineral oxides using two‐dimensional solvents

Harwell

O’Rear

et al. 1988

AIChE Journal

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Thin polymeric films have been applied to the surface of a porous material in a novel process. Nitrogen sorption, a conventional tool for measuring surface areas and pore size distributions, can be employed for determining the thickness of such films through a comparison of the pore size distribution curves before and after film formation. The thickness of a polystyrene film on a porous alumina powder is determined and compared with the theoretical thickness for styrene polymerized inside a two-dimensional solvent, which consists of a partial bilayer of sodium dodecyl sulfate physically adsorbed from an aqueous solution onto the powder. Film thicknesses ranged from 1.8 to 0.4 nm while BET surface area decreased from 94.7 to 57.8 m2/g. The powder surface changes from hydrophilic to hydrophobic while retaining the basic pore structure.

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The Adsorption–Desorption Hysteresis in Relation to Capillarity of Adsorbents.

Cited by 77 publications

References 8 publications

Adsorption of Water Vapor on Active Carbon Preadsorbed with Methanol and Benzene

Adsorption of Water Vapor on Active Carbon Preadsorbed with Methanol and Benzene

Adsorption analysis of carbon dioxide, hydrocarbons and moisture on carbon

Application of thin films to porous mineral oxides using two‐dimensional solvents

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