Tests of the Consistency between Binary Gas Adsorption Isotherms and Binary Chromatographic Retention Volumes

2000 ◽  
Vol 39 (5) ◽  
pp. 1514-1519 ◽  
Author(s):  
Mark J. Heslop ◽  
Bryan A. Buffham ◽  
Geoffrey Mason
Keyword(s):  
Adsorption Isotherms ◽  
Gas Adsorption ◽  
Chromatographic Retention ◽  
Retention Volumes

scholarly journals Studying ZIF-8 SURMOF Thin Films with a Langatate Crystal Microbalance: Single-Component Gas Adsorption Isotherms Measured at Elevated Temperatures and Pressures

Langmuir ◽  
2020 ◽  
Vol 36 (29) ◽  
pp. 8444-8450
Author(s):  
Elvia P. Valadez Sánchez ◽  
Alexander Knebel ◽  
Luis Izquierdo Sánchez ◽  
Michael Klumpp ◽  
Christof Wöll ◽  
...  
Keyword(s):  
Thin Films ◽  
Adsorption Isotherms ◽  
Elevated Temperatures ◽  
Gas Adsorption ◽  
Single Component

ADSORPTIVE AND GAS CHROMATOGRAPHIC PROPERTIES OF VARIOUS CATIONIC FORMS OF ZEOLITE X

1964 ◽  
Vol 42 (10) ◽  
pp. 2340-2350 ◽  
Author(s):  
H. W. Habgood
Keyword(s):  
Ionic Radius ◽  
Adsorption Process ◽  
Divalent Cations ◽  
Chromatographic Retention ◽  
Monovalent Cations ◽  
Zeolite X ◽  
Heats Of Adsorption ◽  
Quadrupole Interactions ◽  
Silver Compound ◽  
Retention Volumes

Gas chromatographic retention volumes for O2, N2, CH4, C2H6, C3H8, C4H10, C2H4, and C3H6 have been measured over a range of temperatures between 25 and 400 °C, on columns of the following ion-exchanged forms of zeolite X: Li+, Na+, K+, Mg++, Ca++, Ba++, and Ag+. In addition, for AgX zeolite, full isotherms have been determined for O2, N2, C2H6, and C2H4; and for NaX zeolite, isotherms for C2H6 and C2H4. The gas chromatographic retention volumes agree well with the isotherms in the case of NaX but are significantly low for AgX, presumably as the result of at least a portion of the adsorption process being slow. The heats of adsorption on NaX agree well with literature values for O2, N2, CH4, and C2H6 but are low for C3H8 and C4H10; further indication of slow processes and hence of a limitation of the g.c. technique. The observations can be correlated qualitatively in terms of the interplay of the following effects: (a) cationic field increases with decreasing ionic radius; (b) shielding of smaller cations is greater—at least in the six-membered oxygen-ring sites; (c) divalent cations, while having greater fields, are only half the number of monovalent cations and tend to be found in less exposed sites; and (d) the polarizing power of silver ion, which also occupies all types of exposed sites, is very strong. The most intense interactions were found with AgX; with ethylene a much stronger complex is formed than has been reported for any other silver compound. The significance of molecular quadrupole interactions on these heteroionic surfaces is shown by the much weaker cationic effects observed with O2 (which has negligible quadrupole moment) than with nitrogen.

Measurement of gas adsorption isotherms by continuous adsorbate addition

Langmuir ◽  
1987 ◽  
Vol 3 (2) ◽  
pp. 300-302 ◽  
Author(s):  
P. S. Northrop ◽  
R. C. Flagan ◽  
G. R. Gavalas
Keyword(s):  
Adsorption Isotherms ◽  
Gas Adsorption

scholarly journals Soft 2D Layer Porous Coordination Polymers with 1,2-Di(4-pyridyl)ethane

2013 ◽  
Vol 66 (4) ◽  
pp. 464 ◽  
Author(s):  
Keisuke Kishida ◽  
Satoshi Horike ◽  
Kanokwan Kongpatpanich ◽  
Susumu Kitagawa
Keyword(s):  
Coordination Polymer ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Adsorption Isotherms ◽  
Gas Adsorption ◽  
Porous Structures ◽  
Porous Coordination Polymers ◽  
Substituent Group ◽  
Layer Structures ◽  
Porous Coordination Polymer

Porous coordination polymer compounds consisting of Zn2+, 1,2-di(4-pyridyl)ethane, and dicarboxylates were synthesised and their crystal structures were determined. These are doubly interpenetrated 2D layer structures, and the flexibility of porous structures is dependent on the substituent group of the dicarboxylate. From gas adsorption studies, distinct adsorption isotherms were observed for CO2, CH4, C2H4, and C2H6 at 195 K and 273 K, respectively.

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