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Thermodynamics of adsorption of organic vapours on carbon black

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Summary

An apparatus for gas adsorption on solids has been described and with the help of this apparatus specific surface area of carbon black was calculated by the adsorption of nitrogen gas on carbon black at liquid air temperature.

The adsorption of methanol, methyl formate, methyl acetate, methyl cyanide, acetaldehyde and methyl ethyl ketone on carbon black has been measured at a number of temperatures between 0° and 40°, and qst the isosteric heat of adsorption, at different temperatures and coverages were computed by usingClausius-Clapeyron equation. The heats of adsorption are shown to be generally consistent with the idea of two adsorption processes occurring simultaneously, one with a small activation energy and one with a larger activation energy.

Zusammenfassung

Es wird eine Apparatur beschrieben, mit der die Adsorption von Gas an festen Körpern bestimmt werden kann. Mit ihrer Hilfe wurde die spezifische Oberfläche von Ruß berechnet, indem Stickstoff-Gas an Ruß bei der Temperatur von flüssiger Luft adsorbiert wurde.

Ferner wurde die Adsorption von Methanol, Methylformiat, Methylazetat, Methylcyanid, Azetaldehyd sowie die der Methyl-Äthyl-Ketone für eine Reihe von Temperaturen zwischen 0° und 40° an Ruß gemessen. Dann wurde mit Hilfe derClausius-Clapeyronschen Gleichung die isosterische Wärme für die Adsorption berechnet. Die so gefundenen Adsorptionswärmen weisen auf zwei voneinander unabhängige Adsorptionsprozesse hin, die sich in der Aktivierungsenergie unterscheiden.

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  1. M. Afzal

    Present address: Institute of Chemistry, University of Islambad, Rawalpindi, Pakistan

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    Afzal, M. Thermodynamics of adsorption of organic vapours on carbon black. Kolloid-Z.u.Z.Polymere 248, 1026–1029 (1971). https://doi.org/10.1007/BF01508063

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    • DOI: https://doi.org/10.1007/BF01508063

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