Heats of Adsorption on Carbon Black. II

Beebe, R. A.; Polley, M. H.; Smith, W. R.; Wendell, C. B.

doi:10.1021/ja01202a016

Cited by 42 publications

(30 citation statements)

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“…per carbon atom for perfluoroethylene. These values are in approximate agreement with values found by Beebe et al (1,2) for the adsorption of a number of hydrocarbons by carbon surfaces. In the discussion which follows, it will be shown that the mode of adsorption is the same for the two gases and that the differences in the heat of adsorption may be accounted for solely in terms of the difference in molecular weight between the two compounds.…”

Section: Sg-ss = ( H G -H S ) / P supporting

confidence: 92%

“…The factors influencing the adsorption of hydrocarbons on carbon surfaces have been exhaustively studied by Beebe and his co-workers (1,2). Beebe et al (2) measured the heats of adsorption calorimetrically for the adsorption of a series of hydrocarbons on a non-porous carbon black.…”

Section: Introductionmentioning

confidence: 99%

“…Beebe et al (2) measured the heats of adsorption calorimetrically for the adsorption of a series of hydrocarbons on a non-porous carbon black. The hydrocarbons chosen were paraffins and olefins containing four or five carbon atoms, and included geometrical isomers and one positional isomer.…”

Section: Introductionmentioning

confidence: 99%

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Charcoal Sorption Studies: Iii. The Adsorption of Ethylene and Perfluoroethylene by an Activated Charcoal

McDermot¹,

Arnell²,

Lawton³

1955

Can. J. Chem.

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The adsorption of ethylene and perfluoroethylene by an activated charcoal has been measured over a range of temperatures. Integral and differential heats have been calculated and compared for the two gases. T h e heats of adsorption of perfluoroethylene are consistently higher than those of ethylene, but only by an amount t o be expected from the difference in molecular weights. The absolute entropy of adsorbed ethylene has been calculated and found t o be in agreement with a model in which the adsorbed moleci~les are mobile and possess a t least two degrees of rotational freedom.

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Section: Sg-ss = ( H G -H S ) / P supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Charcoal Sorption Studies: Iii. The Adsorption of Ethylene and Perfluoroethylene by an Activated Charcoal

McDermot¹,

Arnell²,

Lawton³

1955

Can. J. Chem.

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“…31,33 For example, adsorption of various alkanes on different carbon blacks displayed initial heats of adsorption approximately 3 times larger than their isosteric heat of condensation. 13 In our case, the initial heat of adsorption is at most 1.3 times the butane heat of condensation, as can be seen in Figure 5.…”

Section: Data Analysis and Discussionsupporting

confidence: 50%

Heat of Adsorption of Butane on Multiwalled Carbon Nanotubes

Hilding

Grulke

2004

J. Phys. Chem. B

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We report the isosteric heats of adsorption, q st , for butane on multiwalled carbon nanotubes (MWNTs) over a range of surface loadings at temperatures below the normal boiling point. Butane is a nonspherical, nonpolar molecule that may exhibit different orientations in multilayer adsorption. The morphology of our MWNTs is such that only surface adsorption or capillary condensation can occur: no interstitial sites between nanotubes are available to butane. For these nanotubes, exterior surface adsorption is the principal mechanism measured by gravimetric analysis as the internal pores are only a small volume fraction of the total solid volume. The isosteric heat of adsorption varied with the surface coverage, θ, defined as the ratio of adsorbed butane to the MWNT butane monolayer capacity. The initial heat of adsorption was in the region ∼22-26 kJ/mol, which is approximately 1 / 3 lower than the corresponding value for various graphite-butane systems. At θ ) 1, q st displays a minima (13.5-15.9 kJ/mol). The isosteric heat of adsorption approaches the butane heat of condensation for θ > 2.5, suggesting that the surface film is similar to a bulk phase. The isosteric heat of adsorption of butane on MWNTs can be related to the morphology of the MWNTs. The higher heats of adsorption at low coverages are likely related to the presence of surface defects. The minima in q st near the monolayer coverage relates to a high self-association of butane. At high loadings, the butane surface film is similar to a bulk phase.

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“…Heats of adsorption of hydrocarbons have been shown to approach 80 kJ/mole at very low coverage (for pentane or 1-pentene at 0°C), decreasing with increasing coverage to about 40 kJ/mole at a coverage of one monolayer (compared with a heat of liquefaction of about 25 kJ/mole) [23]. Because of the continuum of adsorption energies it is not always clear whether some of the observed effects in rubber are due to a few strong chemisorptive bonds or to a larger number of weaker bonds.…”

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confidence: 99%