Comparison of gas—solid chromatography properties of tris(ethylenediamine)chromium(III) cation-exchanged montmorillonite, hectorite and attapulgite

Thielmann, Vernon J.; McAtee, James L.

doi:10.1016/s0021-9673(00)85157-2

Cited by 3 publications

(2 citation statements)

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“…The retention times increased with an increase of the number of carbons of the hydrocarbons. This result is comparable to the results for chloroalkylammoniumsmectites (McAtee and Harris, 1977;Thielmann, 1978). No measurable separation of hydrocarbons could be observed on a Na-montmorillonite (Na-M) column.…”

Section: Resultssupporting

confidence: 86%

“…This type of material should be particularly well adapted to the separation of small molecules. However, only a limited amount of data on the applications of organoclays for the separations of gases and hydrocarbons has been reported in the literature (Thielmann and McAtee, 1975;Thielmann, 1978;McAtee and Harris, 1977). A series of organo-clays was used recently as chromatographic adsorbents for the separation of air/ methane/carbon dioxide (Lao et aL, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Gas Chromatographic Separation of Linear Hydrocarbons on Microporous Organo-Smectites

Lao

Detellier

1994

Clays and clay miner.

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Abstract--A series of organo-montmorillonites and organo-hectorites was prepared by complete ionexchange from the pure sodium form of the parent smectites. The organic cations were tetramethylammonium, trimethylated quaternary ammonium derivatives of the lysine and of the ornithine methyl esters, quaternarized polyammonium cations, or tetraphenylphosphonium (TPP). These organo-smectites were used as packing material for gas chromatography columns. Mixtures of light hydrocarbons (methane to n-butane; "CI" to "C4") could be separated. The degree of separation depends on the presence of micropores or of organophilic mesopores. The BET surface area, the micropore and mesopore volumes, as well as the size distribution of micropores and mesopores were measured for several systems. As a general trend, the retention times of the light hydrocarbons decrease with an increase of the micropore volume. In the case of TPP-montmorillonite, characterized by a large mesopore volume but for which no microporosity could be detected, separation of longer linear hydrocarbons (n-pentane to n-octane) could also be achieved.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Gas Chromatographic Separation of Linear Hydrocarbons on Microporous Organo-Smectites

Lao

Detellier

1994

Clays and clay miner.

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Application of transition metal complex formation in gas chromatography, part II

1979

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Adsorption of Dimethylanilines on Montmorillonite in High-Pressure Liquid Chromatography

Mingelgrin

Tsvetkov

1985

Clays and clay miner.

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Abstract--High-pressure liquid chromatography columns were packed with quasi-spherical particles of bentonite (SP-bentonite) which were prepared from a predominantly Na-bentonite powder by spray drying. The strength of adsorption of ring-substituted dimethylanilines on bentonite was directly related to their basicity (pKa). The adsorption of the amino-substituted N, N-dimethylaniline was commonly much weaker than that predicted from its pKa, suggesting that the amino group was the dominant site of interaction between the substituted anilines and the clay.A better separation between the dimethylaniline isomers was obtained on SP-bentonite than on a neutral silica under the same chromatographic conditions. A selectivity factor of 25 was achieved between the most strongly and the least strongly adsorbed ring substituted isomers (3, 5-and 2,6-dimethylaniline, respectively) on the SP-bentonite. The selectivity factor was 3.4 on the silica. This efficiency of separation demonstrated the potential advantage of the readily available bentonite in high-pressure liquid chromatography. The higher resolution achieved in column runs than in batch experiments may be utilized for the elucidation of mechanisms of interaction of organic molecules at clay surfaces by comparing the interaction of a number of closely related adsorbates.

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Comparison of gas—solid chromatography properties of tris(ethylenediamine)chromium(III) cation-exchanged montmorillonite, hectorite and attapulgite

Cited by 3 publications

References 4 publications

Gas Chromatographic Separation of Linear Hydrocarbons on Microporous Organo-Smectites

Gas Chromatographic Separation of Linear Hydrocarbons on Microporous Organo-Smectites

Application of transition metal complex formation in gas chromatography, part II

Adsorption of Dimethylanilines on Montmorillonite in High-Pressure Liquid Chromatography

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