Energy of adsorption of gases and vapors on microporous adsorbents

Dubinin, M. M.; Isirikyan, A. A.; Sarakhov, A. I.; Serpinskii, V. V.

doi:10.1007/bf00906481

Cited by 2 publications

(2 citation statements)

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“…The heats of wetting of these materials by water presented in most of the literature sources were obtained for samples that had been previously treated under vacuum at 400-500°C: q of anatase 512 mJ/m 2 , T = 500°C [2], q of rutile 550 mJ/m 2 , T = 400°C [1]. In our work [42] the value q = 320 mJ/m 2 , which is characteristic of rutile with 99.7% purity and surface area 114 m 2 /g and previously treated at 100°C [67], was used as base. In [68] the value of q for rutile that had been submitted to vacuum treatment at 100°C amounted to 390 and 220 mJ/m 2 , depending on the type of preliminary operations preceding the vacuum treatment.…”

Section: The Total Integral Heats Of Wetting Of Sorbents and Catalystsmentioning

confidence: 99%

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Energetics of the interaction of water and other liquids with the surface of hydrophilic and hydrophobic sorbents according to data on the heats of wetting

Tarasevich

2008

Theor Exp Chem

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Papers on the energetics of the interaction of various substances with the surface of hydrophilic and hydrophobic sorbents using the data from heats of wetting are reviewed. The thermodynamics of wetting is examined, and the important role of the heats of wetting for the production of quantitative data on the surface energy of solids is demonstrated. The uniqueness of the information on the physicochemical characteristics of the sorbents and catalysts obtained from the immersion wetting isotherms is emphasized, and up-to-date information on the extent, structure, and characteristics of the boundary layers of water is analyzed. It is shown that the calorimetric data serve as an experimental base for obtaining data on the structural ordering-disordering of the boundary layers of water.

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Section: The Total Integral Heats Of Wetting Of Sorbents and Catalystsmentioning

confidence: 99%

“…The results in [37][38][39][40][41] are summarized in Table 1. For comparison it also contains data for the zeolite NaA-water system obtained in the Dubinin's laboratory (Moscow) [42] and the thermodynamic characteristics of the hexane (benzene)-Silicalite systems [36] obtained in the laboratory of G. Stach (Berlin).…”

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confidence: 99%

Energetics of the interaction of water and other liquids with the surface of hydrophilic and hydrophobic sorbents according to data on the heats of wetting

Tarasevich

2008

Theor Exp Chem

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Water isotherm models for 4A (NaA) zeolite

Loughlin

2009

Adsorption

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The adsorption data of Gorbach et al. (Adsorption 10(1): 29-46, 2004) and Morris (J. Colloid Interface Sci. 28: 149-155, 1968) for the adsorption of water on 4A zeolite pellets is re-analyzed. Model isotherms are derived considering a two site hypothesis, one for the α cage and one for the β cage. Four simple model isotherms are fitted to the data. Both a dual site Toth or dual site Langmuir isotherm model fit the data adequately.The optimized standard enthalpy and entropy of adsorption parameters derived from the data are surprising for the β cage. The optimized standard enthalpy of the β cage is 1/3rd of that observed calorimetrically, and the standard entropy of adsorption is positive, a physical impossibility. Substituting the calorimetric enthalpy of adsorption corrected the standard differential entropy of sorption values resulting in the standard entropy of sorption values varying significantly with temperature. This variation is postulated to be due to either water of hydration formation, or clathrate formation, or the formation of clusters of water such as dimers, trimers, etc.Keywords Adsorption · Water · 4A (NaA) zeolite · Langmuir isotherm · Toth isotherm · Ruthven isotherm · Dual site isotherm · Standard enthalpy of adsorption · Standard entropy of adsorption Nomenclature f i fractional size of site i K ci dimensionless equilibrium constant ci, cβ for cage β and cα for cage α respectively

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Energy of adsorption of gases and vapors on microporous adsorbents

Cited by 2 publications

References 4 publications

Energetics of the interaction of water and other liquids with the surface of hydrophilic and hydrophobic sorbents according to data on the heats of wetting

Energetics of the interaction of water and other liquids with the surface of hydrophilic and hydrophobic sorbents according to data on the heats of wetting

Water isotherm models for 4A (NaA) zeolite

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