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

Moriguchi, Sadaaki; Naito, Kunishige; Takei, Shinsuke

doi:10.1016/s0021-9673(00)80917-6

Cited by 18 publications

(1 citation statement)

References 21 publications

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“…The method used for preparing the silylating samples was the same as that described earlier; the sample was refluxed in a Soxhlet by 30 vol% of dimethyldichlorosilane in toluene for 6 h. Then, the sample was removed from the Soxhlet, washed by deionized water, and dried at 120 ∘ C overnight. [12,13]. The modification of the surface properties of alumina with alkali metal chloride (NaCl) is described for parent and calcined samples dependent on a 10% salt loading.…”

Section: Preparation Of Aluminamentioning

confidence: 99%

Characterization of Modified and Polymer Coated Alumina Surfaces by Infrared Spectroscopy

Elnaggar¹

2013

Journal of Spectroscopy

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The prepared, modified, and coated alumina surfaces were characterized by infrared spectroscopy (FTIR) to investigate the surface properties of the individual and double modified samples. FTIR helps in reporting the changes occurred in hydroxyl groups as well as the structure changes as a result of thermal treating, hydrothermal treating, silylation treating, alkali metal treating, coating, and bonding with polymer. FTIR spectroscopy represents the strength and abundance of surface acidic OH which determine the adsorption properties of polar and nonpolar sorbents. Generally, all treated samples exhibit decrease of OH groups compared with those of parent ones producing alumina surfaces of different adsorptive powers.

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Section: Preparation Of Aluminamentioning

confidence: 99%

Characterization of Modified and Polymer Coated Alumina Surfaces by Infrared Spectroscopy

Elnaggar¹

2013

Journal of Spectroscopy

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

Cited by 18 publications

References 21 publications

Characterization of Modified and Polymer Coated Alumina Surfaces by Infrared Spectroscopy

Characterization of Modified and Polymer Coated Alumina Surfaces by Infrared Spectroscopy

Modified Gas‐Solid Chromatography

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

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