Adsorption of gases on 4A synthetic zeolite

Harper, Robert J.; Stifel, G. R.; Anderson, R. B.

doi:10.1139/v69-770

Cited by 67 publications

(24 citation statements)

References 4 publications

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“…This is true also of the data of Springer (13), Cook (14), and Harper et al (15) for sorption of argon in both 4A and 5A zeolites.…”

Section: Argonsupporting

confidence: 72%

Sorption of the Inert Gases (Ar, Kr, and Xe) in Type A Zeolites

Derrah¹,

Ruthven²

1975

Can. J. Chem.

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RUSSELL IAN DERRAH and DOUGLAS MORRIS RUTHVEN. Can. J. Chem. 53,996 (1975). Theoretical potential profiles for Ar, Kr, and Xe occluded in an idealized 5A zeolite are calculated and used to evaluate the Henry's law equilibrium constants for these species. Calculations were made using the three common formulae to estimate the dispersion constants (Kirkwood-Mueller, Slater-Kirkwood, and London) and the theoretical Henry constants are compared with the values-obtained directly from experimental equilibrium isotherms. For both Kr and Xe the Slater-Kirkwood formula gives the best agreement with the experimental values while, for argon, the London formula is best. At higher concentrations the isotherms for Kr can be well represented by a simple Langrnuir expression with eleven sites per cavity while for Xe there appears to be a transition from localized sorption at low temperatures to a mobile adsorbed phase at higher temperatures. These conclusions are qualitatively consistent with the results of the theoretical potential calculations.RUSSELL IAN DERRAH et DOUGLAS MORRIS RUTWEN. Can. J. Chem. 53,996 (1975). On calcule les profils potentiels theoriques de Ar, Kr et Xe occlus dans une zeolithe 5A idealis&; on utilise les valeurs ainsi calcul&s pour kvaluer les constantes dY6quilibre de la loi d'Henry pour ces especes. On a fait des calculs utilisant les trois formules ordinaires pour estimer les contantes de dispersion (Kirkwood-Mueller, Slater-Kirkwood et London) et l'on compare les constantes theoriques #Henry avec les valeurs obtenues directement a partir des isothermes experimentales d'equilibre. Pour le Kr et le Xe, la formule de Slater-Kirkwood donne la meilleure relation avec les valeurs experimentales alors que pour I'argon, la formule de London est la meilleure. A des concentrations plus hautes, les isothermes de Kr peuvent aussi dtre presentes par une expression simple de Langmuir avec onze sites par cavite alors que pour Xe il semble qu'il existe une transition passant d'une sorption localisee a basse temperature a une phase adsorb& mobile a plus haute tempbature. Ces conclusions sont qualitativement en accord avec les rksultats des calculs potentiels thioriques.[Traduit par le journal]

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“…This is true also of the data of Springer (13), Cook (14), and Harper et al (15) for sorption of argon in both 4A and 5A zeolites.…”

Section: Argonsupporting

confidence: 72%

Sorption of the Inert Gases (Ar, Kr, and Xe) in Type A Zeolites

Derrah¹,

Ruthven²

1975

Can. J. Chem.

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“…It is noted, however, that zeolite 4A is able to more preferably adsorb N 2 than O 2 . 21 The different adsorption capabilities and thus the adsorption affinity of zeolite A for these gases may be responsible for our observations. For the CO 2 / CH 4 pair, although CO 2 can be more adsorbed than CH 4 by zeolite 4A, its rather appreciated quadrupole is able to render it forming stronger interactions with the zeolite pore surface, and hence CO 2 molecules may be harder to leave the active sites and move forward.…”

Section: The Zeolite 4a/pes Mixed Matrix Membranesmentioning

confidence: 83%

Enhanced gas separation properties by using nanostructured PES‐Zeolite 4A mixed matrix membranes

Huang

Wen

et al. 2006

J of Applied Polymer Sci

103

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ABSTRACT:The polymer-zeolite mixed matrix membranes were fabricated by incorporating nanosized or microsized zeolite 4A into polyethersulfone. A comparison of zeolite 4A nanocrystals and microcrystals was made by using SEM, XRD, N 2 adsorption-desorption measurements. Zeolite particles were well-distributed in the polymer phase, as reflected by the SEM images. The effects of the zeolite 4A particle size on the gas permeation performance were studied. Experimental results demonstrate that mixed matrix membranes exhibit decreased gas permeabilities due to the barrier effect of zeolite particles. The obtained permselectivity is greatly enhanced for He/N 2 , H 2 /N 2 , He/CO 2 , and H 2 /CO 2 gas pairs, especially for nanosized zeolite 4A mixed matrix membranes. The gas permeation performance difference is observed between the nanostructured and microstructured membranes, which is attributed to a combined effect of different zeolite composition and different particle size.

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“…A previous study [67] showed that quadrupolar molecules such as CO 2 and C 2 H 4 have a tendency to be adsorbed more in a zeolite particularly by the anisotropic interactions between the quadrupole moment of adsorbate and the metal cations in the host zeolite. Later studies by Yoon and Huh [28] demonstrated a C 2 H 4 encapsulation capacity of 1.54 molecule cavity À1 on a mixed cations zeolite A (40% K and 60% Na) at pressure of 36 MPa.…”

Section: Encapsulation Investigationmentioning

confidence: 98%