Journal ArticleDOI
The characterization of microporous carbons by means of the dubinin-radushkevich equation
Harry Marsh,Brian Rand +1 more
- Vol. 33, Iss: 1, pp 101-116
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In this article, the Dubinin-Radushkevich (D-R) equation predicts a Rayleigh distribution of adsorption free energy with micropore volume, only when this distribution is present in microporous solids will a completely linear D-R plot result.Abstract:
The Dubinin-Radushkevich (D-R) equation of adsorption predicts a Rayleigh distribution of adsorption free energy with adsorption (micropore) volume. Only when this distribution is present in microporous solids will a completely linear D-R plot result. Adsorption data of carbon dioxide at 195°K and nitrogen and argon at 77°K on various microporous polymer carbons are interpreted in terms of the D-R equation and distributions of free energy with pore volume. In no case is the complete Rayleigh distribution found to apply and corresponding deviations from linear D-R plots occur. Highly activated carbons show a bimodal distribution of free-energy values to nitrogen and argon at 77°K, but not to CO 2 at 195°K. Tentative suggestions for this behavior are presented.read more
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Nitric acid oxidation of vapor grown carbon nanofibers
TL;DR: In this paper, the surface atomic oxygen percent increased from 6.3 to 18.5% for 10−90 min oxidations followed by a drop to 14−15% after 10−24 h oxidations.
Journal ArticleDOI
Microporous carbons and their characterization: The present state of the art
TL;DR: In this paper, the relation between the microporous structure of carbons and the parameters of Dubinin's theory is examined in their historical development, focusing on the correlation between different techniques such as gas adsorption, immersion calorimetry, and high-resolution transmission electron microscopy.
Journal ArticleDOI
Localized adsorption on heterogeneous surfaces
TL;DR: The general theory of localized adsorption on patchwise heterogeneous surfaces, in both the sub-monolayer and the multilayer range, is presented in this article.
Journal ArticleDOI
Analysis of nitrogen adsorption isotherms on porous and nonporous silicas by the BET and αs methods
TL;DR: In this paper, the isosteric heat of adsorption is calculated from the isotherms (over the temperature range −192° to −178°C) on representative materials and surface areas are calculated by means of the BET method and the new αs-method.
References
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Journal ArticleDOI
The Potential Theory of Adsorption of Gases and Vapors for Adsorbents with Energetically Nonuniform Surfaces.
Book
On Physical Adsorption
Sydney Ross,Werner Winkler +1 more
TL;DR: In this article, low-pressure adsorption isotherms of argon and nitrogen at 77.8°K and 90.1°K on graphitized carbon black, P-33, are reported.