Heterogeneity in solution adsorption: Edge carbon and oxide coverages

Coltharp, Marcellus T; Hackerman, Norman

doi:10.1016/0021-9797(73)90363-9

Cited by 20 publications

(2 citation statements)

References 7 publications

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“…Microscopic pictures provide visual information on the structure of the probes. Though the resolution of the scanning tunnel microscopic pictures is rougher in the case of amorphous carbon samples than in the case of the samples showing ordered graphite structure, the resolution limit is correct compared with the roughness of the carbon matrix. − The chemical (polar−nonpolar) character of the carbon surface can be tested by using an adequate binary liquid mixture. − The heterogeneity of the activated carbons prepared from the previously mentioned precursors proved to be independent of their origin according to the liquid adsorption data.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Active Carbons from Different Precursors

Bóta¹,

László²,

Nagy³

et al. 1997

Langmuir

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The effect of the precursor on the morphology, the structure, and the adsorption properties of the activated carbon in the case of poly(ethylene terephthalate) and cellulose, was studied. Scanning tunnel microscopy, X-ray scattering methods, and adsorption from gas and liquid phases were applied to answer the problem. According to adsorption data, the micropore structure and the chemical character of the two activated samples were found to be practically independent of their origin, but essential structural dissimilarities were concluded from SAXS data. STM illustrated the effect of the precursor's structure only in dimensions which are considerably larger than the size of the regions governing the microporous behavior. The morphological differences in the carbon correspond to the different links between the crystallites. Presumably these connections strongly affect the diffusion of the activating agent and thus the pore structure developing during the activation process.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of Active Carbons from Different Precursors

Bóta¹,

László²,

Nagy³

et al. 1997

Langmuir

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“…, 1978bJaroniec, 1977;Bulow et al 1982). It has been shown that in the case of certain solids, such as silica gels or active carbons, the energetic heterogeneity of a gas/solid or solid/solution interface is of prime importance in governing the behaviour of adsorption isotherms, (Jaroniec, 1977;Jaroniec et al 1978a;Coltharp and Hackerman, 1973) heats of adsorption (Rudzinski et al 1983), heat capacities (Rudzinski and Jagiello, 1982), etc. In a great number of cases surface heterogeneity appears to be among the most important physical factors influencing the behaviour of adsorption systems.…”

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confidence: 99%

Adsorption from multicomponent gas mixtures on the heterogeneous surfaces of solid catalysts

Wojuciechowski

Hsu

Rudziński³

1985

Can J Chem Eng

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A generalized isotherm for adsorption of gas mixtures with different molecular sizes on heterogeneous surfaces has been derived. The isotherm retains the form of the equation derived by Crickmore and Wojciechowski (C-W). The single heterogeneity factor in the C-W equation is replaced by a product C , a , which accounts for the combined effect of surface heterogeneity and molecular size. The term is non-separable by experiment but the concept is very important in considering catalytic reactions where a great variety of molecular sizes and types can be adsorbed on the catalyst surface.

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