Adsorption of aromatic hydrocarbons in NaX zeolite. 1. Equilibrium

Ruthven, Douglas M.; Kaul, Bal K.

doi:10.1021/ie00021a028

Cited by 48 publications

(42 citation statements)

References 3 publications

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“…Considering this, it is expected (3) that within micropores sites existscages or dead-end poressin which molecules become effectively trapped. Given a certain pore structure, the probability of immobilization of an adsorbate is expected to increase with the moment of inertia of the adsorbate (30). An exception to this rule is that compounds that can form hydrogen bonds, for example, phenolic compounds, are expected to be more strongly adsorbed to the matrix.…”

Section: Discussionmentioning

confidence: 99%

“…Experiments show that the diffusivity of an adsorbate is correlated with the moment of inertia of the adsorbate, suggesting that the diffusion rate is dependent on the rotational freedom of the diffusing molecule (30). Therefore, transport in microporous materials is referred to as configurational diffusion.…”

Section: Surface Area and Diffusion In Microporous Materialsmentioning

confidence: 99%

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Adsorption of CO₂ and N₂ on Soil Organic Matter: Nature of Porosity, Surface Area, and Diffusion Mechanisms

Jonge

Mittelmeijer‐Hazeleger

1996

Environ. Sci. Technol.

199

140

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The surface area of soil organic matter (SOM) is a crucial parameter for the interpretation of sorption mechanisms of organic contaminants. The surface area of three SOM samples was studied by using CO 2 and N 2 gas adsorption, revealing that SOM is a microporous material with a high surface area of 94-174 m 2 g -1 . The ethylene glycol monoethyl ether (EGME) retention technique has major drawbacks for application to SOM samples, as liquid EGME changes the SOM solid phase density. Nitrogen (N 2 ) is subject to molecular sieving at 77 K due to activated diffusion in micropores. CO 2 is not limited by activated diffusion since higher experimental temperatures are applied (273 K). About 95-99% of the SOM surface area is formed by micropores with maximum restrictions of approximately 0.5 nm. Results suggest that the diffusion coefficient of CO 2 is influenced by the crosslinking density of the matrix and that the microporous structure is not strongly affected by hydration of the sample. On the basis of pore dimensions, configurational diffusion is proposed as the primary transport mechanism of nonionic organic contaminants in SOM micropores.

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Section: Discussionmentioning

confidence: 99%

Section: Surface Area and Diffusion In Microporous Materialsmentioning

confidence: 99%

Adsorption of CO₂ and N₂ on Soil Organic Matter: Nature of Porosity, Surface Area, and Diffusion Mechanisms

Jonge

Mittelmeijer‐Hazeleger

1996

Environ. Sci. Technol.

199

140

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“…The BET (10), Langmuir (11), and t-plot (external) surface areas (12) of the series of mordenites under study were evaluated from N 2 adsorption data in the p/p 0 range extending from 0.04 to 0.2. The total pore volume, V S , was estimated through the Gurvitsch Rule (13) on the basis of the volume adsorbed at a relative pressure p/p 0 % 0.95 and calculated as volume of liquid.…”

Section: Calculation Methodsmentioning

confidence: 99%

Influence of the Si/Al Framework Ratio on the Microporosity of Dealuminated Mordenite as Determined from N₂Adsorption

Hernández

Petranovskii

Авалос

et al. 2006

Separation Science and Technology

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Dealuminated mordenites depicting SiO 2 /Al 2 O 3 molar ratios in the range 10-206 were analyzed through adsorption methods. The Type I-IV hybrid shape of the N 2 adsorption isotherms at 76 K on dealuminated mordenites indicated rather high micropore contents, though some amount of mesopores of slit-like geometry was also present. Micropore volumes and sizes were measured through a S , t, and DA-plots, as well as by the NLDFT approach. Results indicated that mordenite dealumination caused micropore opening and widening as well as the emergence of further slit-like mesopores; even though a slight structural collapse toward creation of mesopore zones occurred at high dealumination extents.

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“…The chromatographic method has been used, described and explained in details in many previous works: (Ruthven, 1984;Ruthven and Kaul, 1993;Denayer and Baron, 1997;Denayer et al, 1998a and b;Askin andInel, 2001 or Tümsek andInel, 2003) so that, we will just give a short summary of the experimental procedure.…”

Section: Chromatographic Methodsmentioning

confidence: 99%

Determination of the Henry Constant for Zeolite-VOC Systems Using Massic and Chromatographic Adsorption Data

2005

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Both the inverse gas chromatographic method and the dynamic gravimetric-calorimetric method were tested in order to determine the Henry constant for toluene on a Na-faujasite type zeolite. We used the pulse technique for the chromatographic method and a system generating low concentration of VOC in a helium flow for the gravimetric technique. The experimental determinations of the Henry constants for toluene were achieved in two different temperature ranges (from 363 to 548 K for gravimetry and from 548 to 673 K for chromatography). The results presented in this paper show the complementarity of two different techniques for the Henry constants determination. The Henry constants obtained with the two techniques at 548 K differ from 8%.

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Adsorption of aromatic hydrocarbons in NaX zeolite. 1. Equilibrium

Cited by 48 publications

References 3 publications

Adsorption of CO₂ and N₂ on Soil Organic Matter: Nature of Porosity, Surface Area, and Diffusion Mechanisms

Adsorption of CO₂ and N₂ on Soil Organic Matter: Nature of Porosity, Surface Area, and Diffusion Mechanisms

Influence of the Si/Al Framework Ratio on the Microporosity of Dealuminated Mordenite as Determined from N₂Adsorption

Determination of the Henry Constant for Zeolite-VOC Systems Using Massic and Chromatographic Adsorption Data

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Adsorption of aromatic hydrocarbons in NaX zeolite. 1. Equilibrium

Cited by 48 publications

References 3 publications

Adsorption of CO2 and N2 on Soil Organic Matter: Nature of Porosity, Surface Area, and Diffusion Mechanisms

Adsorption of CO2 and N2 on Soil Organic Matter: Nature of Porosity, Surface Area, and Diffusion Mechanisms

Influence of the Si/Al Framework Ratio on the Microporosity of Dealuminated Mordenite as Determined from N2Adsorption

Determination of the Henry Constant for Zeolite-VOC Systems Using Massic and Chromatographic Adsorption Data

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Adsorption of CO₂ and N₂ on Soil Organic Matter: Nature of Porosity, Surface Area, and Diffusion Mechanisms

Adsorption of CO₂ and N₂ on Soil Organic Matter: Nature of Porosity, Surface Area, and Diffusion Mechanisms

Influence of the Si/Al Framework Ratio on the Microporosity of Dealuminated Mordenite as Determined from N₂Adsorption