scholarly journals Virial Analysis of the Adsorption of Trifluorochloromethane and Methane by Microporous Carbons and Zeolites

1989 ◽  
Vol 6 (3) ◽  
pp. 136-146 ◽  
Author(s):  
P.J.M. Carrott ◽  
K.S.W. Sing
Keyword(s):  
Pore Structure ◽  
Adsorption Isotherms ◽  
Virial Equation ◽  
Pore Filling ◽  
Heats Of Adsorption ◽  
Zeolite 13X ◽  
Microporous Carbons ◽  
Adsorbent Pore Structure ◽  
Good Agreement

Adsorption isotherms of trifluorochloromethane (CF3Cl) and methane have been determined on a number of microporous carbons and zeolites over a range of temperatures. Analysis of the data by means of the virial equation leads, in most cases, to limiting isosteric heats of adsorption in good agreement with gas chromatographic measurements. A discrepancy found in the case of zeolite 13X is interpreted in terms of specific adsorbate–adsorbent interactions. It is also shown that the shape of the virial plots can provide useful information about the nature of the adsorbent pore structure and the mechanism of pore filling.

scholarly journals Adsorption of Aromatic Mixtures from Solutions by Molecular Sieve 13X

1987 ◽  
Vol 4 (3) ◽  
pp. 185-195
Author(s):  
Khairya Al-Zaid ◽  
Saed Akashah ◽  
Fathi Owaysi ◽  
G.V. Jeffreys ◽  
C. Mumford ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Aromatic Compounds ◽  
Molecular Sieve ◽  
Spectroscopic Method ◽  
Adsorption Coefficient ◽  
Pore Filling ◽  
Heats Of Adsorption ◽  
Strong Affinity ◽  
Before And After

Adsorption isotherms of 3 extracts (concentrated aromatics) have been determined on molecular sieve 13X from solution in iso-octane at 303 and 343 K. The concentration of aromatic compounds before and after adsorption was determined using ultraviolet spectroscopic method of analysis. Values of the adsorption capacity and adsorption coefficient were determined from an equation for pore filling model. The three extract fractions showed a strong affinity for adsorption by molecular sieve. Heats of adsorption of the 3 extract fractions were calculated from adsorption and found to be in the range of 4-20 kJ mol-1.

Studies of the structural heterogeneity of microporous carbons using liquid/solid adsorption isotherms

Langmuir ◽  
1993 ◽  
Vol 9 (10) ◽  
pp. 2555-2561 ◽  
Author(s):  
J. Choma ◽  
W. Burakiewicz-Mortka ◽  
M. Jaroniec ◽  
R. K. Gilpin
Keyword(s):  
Adsorption Isotherms ◽  
Structural Heterogeneity ◽  
Microporous Carbons

Equilibrium Adsorption Isotherms for H2O on Zeolite 13X

2019 ◽  
Vol 64 (3) ◽  
pp. 1063-1071 ◽  
Author(s):  
Karen N. Son ◽  
Tra-My Justine Richardson ◽  
Gregory E. Cmarik
Keyword(s):  
Adsorption Isotherms ◽  
Equilibrium Adsorption ◽  
Zeolite 13X

Synthesis of Zeolite 13X from Coal Fly Ashes and Properties of the Zeolite Products

2014 ◽  
Vol 675-677 ◽  
pp. 724-727 ◽  
Author(s):  
Wei Wei Tu ◽  
Yong Feng Zhang ◽  
Jie Bai ◽  
Wei Liu
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Uv Spectrophotometry ◽  
Zeolite 13X ◽  
Alkali Fusion ◽  
Coal Fly Ashes ◽  
Homogeneous Composition ◽  
Better Than ◽  
Good Agreement

Synthesis of pure-form zeolite 13X was investigated using the alkali fusion-hydrothermal method to dissolve Si and Al sources from fly ash, and with the addition of Si source, to prepare initial gel. Experimental results demonstrated, the regular morphology and homogeneous composition are in good agreement with standard zeolite 13X by characterization of XRD, SEM and IR. The properties of adsorption and CEC values were evaluated by BET and UV-spectrophotometry, respectively. All properties are much better than commercial zeolite 13X. Our results further revealed that like coal fly ash after alkali fusion pretreatment can be used for zeolite synthesis. Thus, It demonstrates a promising feedstock for the green synthesis of zeolites directly without experiencing intermediate chemicals.

Calorimetric Heats of Adsorption and Adsorption Isotherms. 3. Mixtures of CH4and C2H6in Silicalite and Mixtures of CO2and C2H6in NaX

Langmuir ◽  
1997 ◽  
Vol 13 (16) ◽  
pp. 4333-4341 ◽  
Author(s):  
J. A. Dunne ◽  
M. Rao ◽  
S. Sircar ◽  
R. J. Gorte ◽  
A. L. Myers
Keyword(s):  
Adsorption Isotherms ◽  
Heats Of Adsorption

Adsorption isotherms and isosteric heats of adsorption for ethane, propane, and n-butane on polystyrene

1985 ◽  
Vol 106 (2) ◽  
pp. 399-409 ◽  
Author(s):  
Daniel P. Rothstein ◽  
Bao-Gang Wu ◽  
T. Victor Lee ◽  
Richard Madey
Keyword(s):  
Adsorption Isotherms ◽  
Heats Of Adsorption

Three-State Lattice-Gas Model of H-S on Pt(111)

1987 ◽  
Vol 111 ◽  
Author(s):  
Per Arne Rikvold ◽  
Joseph B. Collins ◽  
G. D. Hansen ◽  
J. D. Gunton ◽  
E. T. Gawlinski
Keyword(s):  
Adsorption Isotherms ◽  
Ground State ◽  
Lattice Gas ◽  
Nearest Neighbor ◽  
Numerical Study ◽  
Finite Size ◽  
Lateral Interaction ◽  
Finite Size Scaling ◽  
Enhanced Adsorption ◽  
Good Agreement

AbstractWe consider a three-state lattice-gas with nearest-neighbor interactions on a triangular lattice as a model for multicomponent chemi- and physisorption. By varying the lateral interaction constants between the adsorbate particles, this model can be made to exhibit either enhanced adsorption or poisoning (inhibited adsorption). We discuss here the conditions on the interaction constants that lead to poisoning. We present the results of a ground-state calculation and detailed numerical study of the phase diagram for a set of interactions that exhibits poisoning. We calculate the phase diagrams and adsorption isotherms by the finite-size scaling transfer-matrix method. We consider the result as a simple model for the coadsorption of Sulphur and Hydrogen on a Platinum (111) surface, with interaction constants estimated from experimental data. The resulting adsorption isotherms are in good agreement with experimental results.

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