Characterization of modified alumina as an adsorbent for gas-solid chromatography

Naito, Kunishige; Endo, Masahiro; Moriguchi, Sadaaki; Takei, Shinsuke

doi:10.1016/s0021-9673(01)88378-3

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…Because of this, only P-cyclodextrin was used as a stationary phase for longer columns. (20) 2-butyne, (21) 2-methylpentane, (22) 3-methylpentane, (23) hexane, (24) 1 -hexene (3-5 ppm each).…”

Section: Resultsmentioning

confidence: 99%

Cyclodextrin PLOT columns for the gas‐solid chromatographic separation of light hydrocarbons and inorganic gases

Reid

Armstrong

1994

J Microcolumn Separations

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Abstract. Alpha and beta cyclodextrin (a-and /3-CD) were chemically bonded to porous layer fused silica open tubular columns and used as gas-solid chromatographic (GSC) stationary phases for the separation of Cl to C6 hydrocarbons and a variety of inorganic gases. In general, these cyclodextrin PLOT columns were superior to the analogous packed columns. The capillary columns show similar selectivities with an increase in efficiency and number of theoretical plates over the packed columns. The cyclodextrin stationary phases show good selectivities toward the light hydrocarbons and inorganic gases on capillary columns as short as ten meters. Subambient temperatures allow the baseline resolution of oxygen from nitrogen. These columns have been effectively utilized at temperatures up to 260°C without loss of efficiency or degradation of selectivity.

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Section: Resultsmentioning

confidence: 99%

Cyclodextrin PLOT columns for the gas‐solid chromatographic separation of light hydrocarbons and inorganic gases

Reid

Armstrong

1994

J Microcolumn Separations

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“…It is reasonable to note [56] that, depending on the salt loading, the original adsorbent is, as a rule, converted into a Wc/Wp, g-salt/g-adsorbent Adsorbents pre-heated at 500°C (l), 700°C (2), 900 "C (3) and 1000 "C (4). It is reasonable to note [56] that, depending on the salt loading, the original adsorbent is, as a rule, converted into a Wc/Wp, g-salt/g-adsorbent Adsorbents pre-heated at 500°C (l), 700°C (2), 900 "C (3) and 1000 "C (4).…”

Section: Deactivation Of Alumina By Inorganic Saltsmentioning

confidence: 99%

“…surface area and surface adsorption activity will reflect different distributions of the salt on the adsorbent surface [56]. Detailed cidated that such adsorbents were suitable as column packing materials at the temperature of liquid nitrogen for separation of hydrogen isotopes by GSC.…”

Section: Deactivation Of Alumina By Inorganic Saltsmentioning

confidence: 99%

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Modified Gas‐Solid Chromatography

Berezkin¹,

Zeeuw²

1996

Capillary Gas Adsorption Chromatography

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Modified Gas-Solid ChromatographyThe solution of many difficult analytical problems of practical importance and the development of gas-solid chromatography can be achieved, in our opinion, by using modified gas-solid chromatography. Modified gas-solid chromatography is a variant of gas chromatography which uses an adsorbent covered by stable (under the experimental conditions) continuous or island-type layer of organic or inorganic volatile or involatile compounds, whose presence modifies the chemical or structural composition of the adsorbent surface, thus changing the nature and intensity of molecular interactions taking place between different analytes and the surface of the adsorbent. Fig. 5-1 shows the main variants of modified gas-solid chromatography. Of course, hybrid modified chromatography set-ups are some-times also useful (for example, simultaneous operation of both variant II and variant IV).In one of the versions of modified gas-solid chromatography, adsorbents covered by a stable layer of organic or inorganic compounds are used. The presence of modifier changes the chemical composition of the adsorbent surface and therefore the nature and intensity of molecular interactions taking place between the modified surface and the various analytes of a mixture under study. As a result, the adsorption energy of each component of the mixture usually decreases, permitting use of sorbent material at a much lower temperature. The selectivity of the modified stationary phase increases concomitantly. Finally, by changing the nature of the modifying compound and its surface concentration, it is possible to change the absolute and relative retention over a wide range. Capillary Gas Adsorption Chromatography

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Separation of unsaturated and aromatic hydrocarbons on capillary columns packed with barium sulphate

1985

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Characterization of modified alumina as an adsorbent for gas-solid chromatography

Cited by 17 publications

References 13 publications

Cyclodextrin PLOT columns for the gas‐solid chromatographic separation of light hydrocarbons and inorganic gases

Cyclodextrin PLOT columns for the gas‐solid chromatographic separation of light hydrocarbons and inorganic gases

Modified Gas‐Solid Chromatography

Separation of unsaturated and aromatic hydrocarbons on capillary columns packed with barium sulphate

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