Adsorption of noble gases on the carbon adsorbents supersorbon HS and Jado

1983 ◽  
Vol 48 (3) ◽  
pp. 819-826 ◽  
Author(s):  
Ludmila Wilhelmová ◽  
František Cejnar
Keyword(s):  
Gas Chromatography ◽  
Active Carbon ◽  
Noble Gases ◽  
Carbon Adsorbent ◽  
Adsorption Properties ◽  
Carbon Adsorbents ◽  
Adsorption Behaviour ◽  
Practical Application ◽  
Heats Of Adsorption ◽  
Temperature Range

The isotherms, isosters and heats of adsorption of argon, krypton and xenon were measured on the active carbon Supersorbon HS and the carbon adsorbent Jado LD 1191 - in a temperature range 298-473 K, using gas chromatography. Differences were observed in the adsorption behaviour of both types of adsorbents - which showed especially on the nonlinearity of adsorption isosters of all gases studied with the Jado LD 1191 adsorbent. It was found that both types of adsorbents possess good adsorption properties, which can be - for Supersorb HS - utilized in the beds of the delaying lines of radioactive noble gases. The practical application of the Jado LD 1191 adsorbent for the same purposes is limited by the presence of inactive teflon support in the structure of this adsorbent.

scholarly journals Adsorption Properties and Structure of Some Active Carbons

1993 ◽  
Vol 10 (1-4) ◽  
pp. 211-220 ◽  
Author(s):  
I.A. Bardina ◽  
E.V. Kalashnikova ◽  
N.V. Kovaleva ◽  
T.A. Rudnitskaya ◽  
N.K. Shonya
Keyword(s):  
Gas Chromatography ◽  
Carbon Black ◽  
Active Carbon ◽  
Graphitized Carbon Black ◽  
Adsorption Properties ◽  
Static Method ◽  
Active Carbons ◽  
Heats Of Adsorption ◽  
Graphitized Carbon ◽  
Low Coverage

Gas chromatography has been used to determine the initial low-coverage heats of adsorption of C2–C6 hydrocarbons and their derivatives on active carbon and graphitized carbon black. The porous structure of the active carbon has been determined from the adsorption isotherms of benzene measured at 25°C by a vacuum static method. The isotherms have been analyzed with the help of the BET and Dubinin–Radushkevich theories.

The use of the theory of statistical moments for a description and evaluation of noble gase breakthrough in carbon adsorbent beds

1983 ◽  
Vol 48 (3) ◽  
pp. 827-837 ◽  
Author(s):  
Ludmila Wilhelmová ◽  
František Cejnar ◽  
Zdeněk Dvořák
Keyword(s):  
Gas Chromatography ◽  
Active Carbon ◽  
Noble Gases ◽  
Carbon Adsorbent ◽  
Breakthrough Curves ◽  
Statistical Moments ◽  
Dynamic Adsorption

The values of the first-fourth statistical moments have been determined of the argon, krypton and xenon breakthrough curves, which were measured on the active carbon Supersorbon HS and the carbon adsorbent Jado LD 1191 beds, at temperatures 298-473 K, by means of elution gas chromatography. The application of the Gram-Charlier series - including the first-fourth statistical moments - enabled to describe satisfactorily the breakthrough curves over the whole range of outlet concentrations of the studied gases. On the basis of the theory of statistical moments, selected parameters, characterizing the dynamic adsorption in the studied systems were determined. The obtained parameters allowed to compare and evaluate the properties of the adsorption beds of both adsorbents - especially with respect to their possible use as a packing in the delaying line units of radioactive noble gases.

Adsorption of organics on thermally treated solids obtained from colloidal silica

1987 ◽  
Vol 52 (3) ◽  
pp. 572-581 ◽  
Author(s):  
Miroslav M. Kopečni ◽  
Slobodan K. Milonjic ◽  
Wladyslaw Rudzinski ◽  
Jacek Jagiello
Keyword(s):  
Gas Chromatography ◽  
Thermodynamic Parameters ◽  
Adsorption Isotherms ◽  
Colloidal Silica ◽  
Adsorption Properties ◽  
Thermal Pretreatment ◽  
Lateral Interactions ◽  
Adsorbed Molecules ◽  
Temperature Range ◽  
Thermally Treated

Adsorption isotherms of three adsorbates on the solid beads obtained from colloidal silica were determined by means of gas chromatography at low surface coverages, when lateral interactions between the adsorbed molecules are negligible. The influence of thermal pretreatment on the adsorption properties of the solids was investigated in the temperature range from 343 to 423 K, while the solids were heated between 523 K and 1 223 K. The thermodynamic parameters of adsorption have been determined and used to discuss the adsorbate-adsorbent interactions.

scholarly journals Studies of adsorption of polychlorocarbons on carbon blacks by gas chromatography

1985 ◽  
Vol 2 (4) ◽  
pp. 219-228 ◽  
Author(s):  
E. V. Zagorevskaya ◽  
N. V. Ishchenko ◽  
A. V. Kiselev ◽  
N. V. Kovaleva
Keyword(s):  
Gas Chromatography ◽  
Carbon Black ◽  
Adsorption Properties ◽  
High Adsorption ◽  
Heats Of Adsorption ◽  
Carbon Blacks ◽  
Before And After ◽  
Retention Volumes ◽  
High Adsorption Capacity ◽  
Airborne Chemicals

Adsorption properties of carbon black before and after modification to polyhalogenohydrocarbons, including polyorganochlorine pesticides, have been investigated. It has been shown that graphitised thermal carbon blacks and carbochroms possess high adsorption capacity relative to the above compounds and can be used as supporting adsorbents to analyse these airborne chemicals. Modification raises the selectivity of adsorbents to the compounds being investigated and lowers retention volumes and heats of adsorption, which makes it possible to carry out thermal desorption of the accumulated species at lower temperatures.

Study of a new type of active carbon CF-1 as an adsorbent in gas chromatography

1982 ◽  
Vol 47 (2) ◽  
pp. 582-587 ◽  
Author(s):  
Ladislav Feltl ◽  
Jana Hronková ◽  
Eva Smolková
Keyword(s):  
Gas Chromatography ◽  
Stationary Phase ◽  
Active Carbon ◽  
Retention Data ◽  
Heats Of Adsorption ◽  
New Type

A new type of active carbon, CF-1, was used as the stationary phase in gas chromatography. The adsorption of n-alkanes C2-C5, 1-alkenes C2-C4, acetylene, alcohols, ethyl ethers, CO2, H2S and SO2 was studied. The measurements were carried out with the original adsorbent and after its reduction with hydrogen at a temperature of 1 000°C. The original and pretreated active carbon were evaluated on the basis of the determined retention data and calculated value of the differential heats of adsorption.

scholarly journals Effect of Catalytic Gasification of Active Carbon from Plum Stones on its Mesoporous Structure

1993 ◽  
Vol 10 (1-4) ◽  
pp. 221-240 ◽  
Author(s):  
R. Leboda ◽  
W. Grzegorczyk ◽  
A. Lodyga ◽  
A. Dabrowski
Keyword(s):  
Active Carbon ◽  
Carbon Adsorbent ◽  
Carbonaceous Material ◽  
Mesoporous Structure ◽  
Carbon Adsorbents ◽  
Porous Structures ◽  
X Ray Diffraction ◽  
Catalytic Gasification ◽  
Adsorption Desorption ◽  
Kinetics Of

The possibilities of the development of a mesoporous structure during gasification of carbonaceous material with water vapour in the presence of a calcium(II) catalyst are demonstrated. Investigations have been carried out on active carbon prepared from plum stones. For comparison, the same experiments in the absence of the catalyst were also made. The characteristics of the micro- and meso-porous structures of the adsorbents have been determined from the adsorption–desorption isotherms of nitrogen. The data have been submitted to treatment from the BET, Harkins–Jura, Sing as well as Derjaguin, Broeckhoff, de Boer and Dubinin equations. The texture of the adsorbent particles has been studied by means of scanning electron microscopy. The kinetics of gasification of the carbon adsorbent in the presence and absence of catalyst has also been studied. In addition, samples of the prepared carbon adsorbents were examined by X-ray diffraction.

Adsorption of sulfur dioxide by active carbon treated by nitric acid: II. Effect of preheating on the adsorption properties

Carbon ◽  
1997 ◽  
Vol 35 (10-11) ◽  
pp. 1645-1648 ◽  
Author(s):  
A. Lisovskii ◽  
G.E. Shter ◽  
R. Semiat ◽  
C. Aharoni
Keyword(s):  
Nitric Acid ◽  
Sulfur Dioxide ◽  
Active Carbon ◽  
Adsorption Properties

Stereospecific analysis of triacylglycerols via racemic phosphatidylcholines and phospholipase C

1979 ◽  
Vol 57 (2) ◽  
pp. 117-124 ◽  
Author(s):  
J. J. Myher ◽  
A. Kuksis
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Phospholipase C ◽  
Fatty Acid Distribution ◽  
Stereospecific Analysis ◽  
Complete Analysis ◽  
Practical Application ◽  
Random Generation ◽  
Grignard Degradation

A method of simultaneous determination of stereospecific distribution and molecular association of acyl groups in triacylglycerols has been developed. The analysis is based on a random generation of rac-1, 2-diacylglycerols by Grignard degradation, synthesis of rac-phosphatidylcholines, and a stereospecific stepwise release of 1, 2-sn- and 2, 3-sn-diacylglycerols by phospholipase C. The exact structure of the original triacylglycerols is reconstituted on the basis of complete analysis of the molecular species of the 1, 2-sn- and 2, 3-sn-diacylglycerols as the tertiary-butyldimethylsilyl ethers by gas chromatography with mass spectrometry. The validity of the method is demonstrated by analyses of synthetic triacylglycerols of known structure. A practical application is illustrated by determination of the fatty acid distribution in lard.

Extending the upper temperature range of gas chromatography with all-silicon microchip columns using a heater/clamp assembly

2017 ◽  
Vol 1517 ◽  
pp. 134-141 ◽  
Author(s):  
Abhijit Ghosh ◽  
Jacob E. Johnson ◽  
Johnathan G. Nuss ◽  
Brittany A. Stark ◽  
Aaron R. Hawkins ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Temperature Range ◽  
Silicon Microchip
Sign in / Sign up

Export Citation Format

Share Document