Determination of the Surface Fractal Dimension of Active Carbons by Mercury Porosimetry

Ehrburger‐Dolle, Françoise; Lavanchy, André; Stoeckli, Fritz

doi:10.1006/jcis.1994.1317

Cited by 31 publications

(20 citation statements)

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“…For D 3 b 3, the values are nonphysical from a geometric point of view and can be attributed to the compressibility of the coal. Similar results were obtained by Ehrburger-Dolle et al [6] for activated carbons in their fractal dimension analysis. The aim of this work is to apply mercury porosimetry of ®ne coal particles in order to obtain reliable mercury intrusion data for the characterization of their pore structure.…”

Section: Introductionsupporting

confidence: 90%

“…In many applications, ®ne particles are often used. Thus characterization of pore structure in the macropore size regime could not be the same as the lump or large particles since crushing and grinding process could affect parts of macropore size distribution [6]. Higher pressure, on the other hand, could compress the coal matrix or damage the pore wall initially existed, and cause the reduction in the bulk volume of the sample.…”

Section: Introductionmentioning

confidence: 99%

“…Mercury porosimetry data can also be used to evaluate the fractal dimension of porous materials [5,6,8,9]. The fractal dimension is an intrinsic, quantitative measurement of the surface irregularity.…”

Section: Introductionmentioning

confidence: 99%

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Compressibility and Fractal Dimension of Fine Coal Particles in Relation to Pore Structure Characterisation Using Mercury Porosimetry

Li¹,

Lu²,

Rudolph³

1999

Part. Part. Syst. Charact.

115

109

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Mercury porosimetry has been applied to characterize the pore structure of ®ne coals particles. Interparticle voids and compressibility effects on the mercury intrusion data were examined. It is found that coal compressibility has a signi®cant effect on mercury porosimetry data when pressure P b 20 MPa. The compressibility of the two coals used was determined to be 3.13610and 2.50610 À10 m 2 N À1 for CA and GO coals, respectively. Fractal dimension analysis provides a``®ngerprint'' to distinguish the effect of coal compression from the pore ®lling process during mercury intrusion. It is shown that fractal dimension can be evaluated from the compressibility corrected pore volume data.Results from the present study suggest that statistic self-similarity of the fractal dimension perspective is limited by certain arti®cial effects, such as crushing and grinding. Different surface irregularities exist over different pore size ranges, and a single fractal dimension value can only be used to describe the surface irregularity within a limited pore size range. The average fractal dimensions in the pore size range of 6±60 nm were found to be 2.71 and 2.43 for CA and GO coals, respectively.

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Section: Introductionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Compressibility and Fractal Dimension of Fine Coal Particles in Relation to Pore Structure Characterisation Using Mercury Porosimetry

Li¹,

Lu²,

Rudolph³

1999

Part. Part. Syst. Charact.

115

109

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“…The range of pore length scales over which a fractal scaling law applies (large-Q range) may also be accessed by MIP. Indeed, this technique has been used to determine surface fractal dimensions (Ehrburger-Dolle et al 1994), yielding results in reasonable agreement with SAXS measurements (Blacher et al 2000). Fractal analysis of MIP data is based on the scaling law:…”

Section: Pore Size Distribution From Imaging Mip and Scattering Datamentioning

confidence: 97%

Statistical Synthesis of Imaging and Porosimetry Data for the Characterization of Microstructure and Transport Properties of Sandstones

et al. 2010

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The microstructure of a suite of sandstone samples is quantitatively analyzed using a method which combines information from thin section micrographs of the pore space with mercury injection porosimetry in a statistical framework. This method enables the determination of a continuous distribution of pore sizes ranging from few nanometre to several hundred micrometre. The data obtained unify fractal and Euclidean aspects of the void space geometry, yield estimates of the pore-to-throat aspect ratio and challenge the ability of commonly used network models to describe fluid percolation in multiscale porous media. Application of critical path analysis to the prediction of flow permeability and electrical conductivity of sandstone core samples using the new information produces results comparable to those obtained by the classical approach-a fact attributed to the presence of macroscopic heterogeneity at the scale of several millimetres.

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“…As mentioned in Section 1.3.4, the use of monoliths (see Chapter 11) is also of interest. As a final comment, it should be mentioned that the fractal approach [211,212] to the elucidation of carbon surface physics (including pore size distribution, surface roughness, and transport characteristics), although initially very promising [213][214][215][216][217][218][219][220][221][222][223][224][225][226][227], does not yet seem to have fulfilled the optimistic expectations. For example, Huang et al [224] combined TEM with image processing to investigate the micropore structure of two rayon-derived ACFs and concluded, rather prosaically, that the "fractal dimensions obtained were consistent with those obtained by nitrogen adsorption."…”

Section: Surface Propertiesmentioning

confidence: 99%

Physicochemical Properties of Carbon Materials: A Brief Overview

Radović

2008

Carbon Materials for Catalysis

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Determination of the Surface Fractal Dimension of Active Carbons by Mercury Porosimetry

Cited by 31 publications

References 0 publications

Compressibility and Fractal Dimension of Fine Coal Particles in Relation to Pore Structure Characterisation Using Mercury Porosimetry

Compressibility and Fractal Dimension of Fine Coal Particles in Relation to Pore Structure Characterisation Using Mercury Porosimetry

Statistical Synthesis of Imaging and Porosimetry Data for the Characterization of Microstructure and Transport Properties of Sandstones

Physicochemical Properties of Carbon Materials: A Brief Overview

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