Results 181 to 190 of about 5,534 (223)

Interaction energy and isosteric heat of adsorption between hydrogen and magnesium diboride

Physical Chemistry Chemical Physics, 2023
A first-principles analytical model of gas physisorption on a layered material is developed through specific evaluation of molecular H2 adsorption on crystalline MgB2, with benchmarking from density functional theory computations.
Thi Kieu Ngan Pham, Sichi Li, Joseph J. Brown   +2 more
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Derivation of isosteric heat of adsorption for non-ideal gases

International Journal of Heat and Mass Transfer, 2015
Abstract This paper presented a theoretical framework for precise determination of the isosteric heat of adsorption for non-ideal gases. The derived equation had been applied for various adsorbent–refrigerant pairs. Highly porous activated carbon powder, namely Maxsorb III and activated carbon fiber of type (A-20) were used as adsorbents with HFC ...
Ahmed A. Askalany, Bidyut B. Saha
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Isosteric and calorimetric heats of adsorption of methanol on coal

Energy & Fuels, 1992
A thermodynamic approach was used to study the surface heterogeneity of Bruceton coal sample. Specifically, the heat of adsorption of methanol on coal was obtained by two different techniques, viz. calorimetry and gas adsorption. Analysis of the isosteric heat of adsorption obtained from the adsorption isotherms revealed that below monolayer coverage ...
R. Ramesh, M. Francois, P. Somasundaran, J. M. Cases   +3 more
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Determination of Isosteric Heat of Adsorption by Quenched Solid Density Functional Theory

Langmuir, 2017
The heat of adsorption is one of the most important parameters characterizing energetic heterogeneity of the adsorbent surface. Heats of adsorption are either determined directly by calorimetry or calculated from adsorption isotherms measured at different temperatures using the thermodynamic Clausius-Clapeyron equation.
Richard T. Cimino, Piotr Kowalczyk, Peter I. Ravikovitch, Alexander V. Neimark   +3 more
openaire   +2 more sources

Isosteric heats of adsorption for nitrogen adsorbed on microporous silica

Journal of the Chemical Society A: Inorganic, Physical, Theoretical, 1971
Nitrogen adsorption isotherms at three different but similar temperatures were determined on samples of microporous silicas prepared by a freeze–thaw technique. A maximum in the plot of the isosteric heat of adsorption against coverage was observed on all the samples investigated.
D. Dollimore, T. Shingles
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Characterization of Adsorption-Induced Swelling of Coal Considering Isosteric Heat of Adsorption

59th U.S. Rock Mechanics/Geomechanics Symposium
ABSTRACT: The volumetric response of coal with gas depletion in coalbed methane (CBM) reservoirs is a widely recognized fact. The adsorption-induced swelling has a significant impact on coal permeability, controlling the production efficiency of CBM. This phenomenon has received considerable implications on enhanced
Kunming Zhang, Ang Liu, Shimin Liu
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Deduction of isosteric heats of adsorption from constant volume experiments

The Journal of Physical Chemistry, 1979
The isosteric heat of oxygen adsorption was calculated for 2:1, 1:1, and 2:3 bismuth molybdate by a modified Clausius-Clapeyron equation which accounted for the constraint imposed by a closed volume, and by a newly developed kinetic equation which described the pressure buildup as a function of time when the catalyst is depleted of oxygen by heating in
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Isosteric heats of adsorption of selected compounds on diesel particulate matter

Environmental Science & Technology, 1982
Isosteric heats of adsorption were determined for 18 compounds with low injection volumes. The isosteric heats of adsorption of benzene and hexane on the pretreated Diesel samples were compared with those of the same compounds on a graphitized carbon black.
Mark M. Ross, Terence H. Risby, Samuel S. Lestz, Ronald E. Yasbin   +3 more
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Isosteric heats of adsorption of xenon in silver-exchanged Y zeolites

Zeolites, 1993
Abstract Silver-exchanged Y zeolites provide examples of unusual adsorption and also of 129Xe n.m.r. chemical-shift behavior of the encaged xenon atoms. In the present contribution, we obtained isosteric heats of adsorption from temperature-dependent measurements of the adsorption isotherms of xenon in these zeolites.
J. Watermann, B. Boddenberg
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Moisture adsorption properties and adsorption isosteric heat of dehydrated slices of Pastirma (Turkish dry meat product)

Meat Science, 2005
Moisture sorption characteristics of dehydrated pastirma were investigated at 15°C, 20°C and 30°C over a water activity (a(w)) range of 0.2-0.9. Sigmoidal (type-II) adsorption isotherms were observed for pastirma. The experimental sorption data obtained were applied to the Halsey, Harkins-Jura, Smith, BET, Henderson, Freundlich and GAB isotherm ...
Gurses, Ahmet, AKTAS, Nesimi
openaire   +3 more sources