Changes in PSD of progressively activated carbons obtained from their supercritical methane isotherms

Sosin, K.A.; Quinn, D.F.; Macdonald, J. A.

doi:10.1016/s0008-6223(96)00067-x

Cited by 9 publications

(7 citation statements)

References 10 publications

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“…It has been demonstrated that it is capable of identifying pore sizes and determining their pore volume for pores not detected by 77 K nitrogen. 27 In addition to the use of supercritical methane adsorption, the adsorption of CO 2 up to pressures of 3 MPa has also been studied previously. [23][24][25] It was shown that high-pressure CO 2 adsorption at 273 K can be used to characterize the whole range of porosity (down to a pore size close to 0.4 nm).…”

Section: Introductionmentioning

confidence: 99%

Micropore Size Distributions of Activated Carbons and Carbon Molecular Sieves Assessed by High-Pressure Methane and Carbon Dioxide Adsorption Isotherms

et al. 2002

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Experimental N2 adsorption isotherms and high-pressure CO2 and CH4 adsorption isotherms have been obtained for a series of microporous carbon materials prepared for being used in gas separation and methane storage. The shape of the isotherms is very different, which is due in part to differences in the overall micropore volume but, additionally and importantly, to the significant differences in the micropore size distribution of those samples. Micropore size distributions (MPSDs) have been deduced from those N2, CO2, and CH4 isotherms by application of the General Adsorption Isotherm (GAI), according to two different approaches proposed in previous independent works. The comparison of the results has shown that, despite the different characteristics of CH4 and CO2, and the different experimental temperatures and adsorption conditions (298 K, supercritical conditions, and 273 K, subcritical conditions, respectively), a quite good consistency between the MPSDs from these two gases has been obtained for all the samples studied. That suggests that both methods are suitable to analyze more sensibly the changes in the MPSDs of microporous samples. The fact that these MPSDs analysis are based on high-pressure adsorption isotherms and that CO2 is especially useful for characterizing the narrow microporosity not accessible to N2 makes both techniques very useful for the characterization of microporous samples.

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Section: Introductionmentioning

confidence: 99%

Micropore Size Distributions of Activated Carbons and Carbon Molecular Sieves Assessed by High-Pressure Methane and Carbon Dioxide Adsorption Isotherms

et al. 2002

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“…Usually, the only enforced equivalence between the pore network model and the real structure is that they both yield the same adsorption isotherm for a single pure adsorbate. The simplest pore network model is the “bundle of straight pores” (or “BSP”) model. − In this model, each pore is considered to be accessible to all the adsorptive species in the bulk gas phase. One can imagine (conceptually) a bundle of pores each of which connects to the surface of the adsorbent or (more physically) a connected network of pores in which the connectivity of the network is sufficiently good that the adsorptive species can pass throughout the network.…”

Section: Introductionmentioning

confidence: 99%

“…The most appropriate molecular simulation technique applied to adsorption in microporous solids is the grand canonical Monte Carlo (GCMC) simulation method . Originally applied only to the adsorption of pure components, it has more recently been extended to calculate the adsorption of several species adsorbing simultaneously. − McEnaney et al, Davies and Seaton, Davies et al, López-Ramón et al, Gusev et al, Gusev and O'Brien, Saimos et al, and Sosin et al have in turn applied GCMC simulations to the characterization of activated carbons. (Sosin et al used the simulated results of Cracknell et al in their calculations.)…”

Section: Introductionmentioning

confidence: 99%

Development and Validation of Pore Structure Models for Adsorption in Activated Carbons

Davies

Seaton

1999

Langmuir

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Predicting adsorption over a range of operating conditions and the improvement of the adsorbent itself are two important aspects that arise in the industrial application of adsorption. Both of these aspects can be addressed using molecular simulation techniques in conjunction with an appropriate model of the internal structure of the adsorbent. The internal structure of activated carbons is particularly difficult to model due to the fact that the structure is only locally crystalline and that most of the void volumes within the structure have length scales comparable to small molecules. This paper presents a systematic method to develop suitable models of the internal structure that are based on networks of regularly shaped model pores. Important aspects that are addressed include the realism and consistency of the resulting models. The method is illustrated using the adsorption of pure methane and ethane, and binary mixtures of these components, over a wide range of operating conditions onto four activated carbons.

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“…In contrast to the representation of a PSD as an analytical function, a discrete representation is more flexible and does not attempt to quantify the PSD away from the quadrature points. Recent PSD analyses that have been based on discrete distributions include those of McEnaney et al, Gusev et al, Gusev and O'Brien, Samios et al, Sosin et al, and Sosin and Quinn . In this paper we extend the development of such an approach and show how it can be used to establish whether any PSD exists that can be fitted to the data and how it can be used to calculate a PSD representative of the real solid.…”

Section: Determining Whether a Psd Can Be Fitted To Experimental Adso...mentioning

confidence: 93%

Calculation of Pore Size Distributions of Activated Carbons from Adsorption Isotherms

1999

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The ability to determine whether a pore size distribution can be fitted to a given set of experimental data is relevant to the development of pore network models of the internal structure of activated carbons and other amorphous adsorbents. A closely related problem that arises when pore size distributions can be fitted to a given set of data is to determine suitable methods to calculate reliable, stable, and representative pore size distributions. This paper addresses both of these issues by presenting a procedure to determine whether a pore size distribution based on a specified model pore geometry can be fitted to a set of experimental data and then using this procedure, in conjunction with regularization techniques that stabilize the calculations, to determine statistically significant pore size distributions. This approach has been demonstrated using the adsorption of methane at 308 K onto BPL-activated carbon as a case study.

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Changes in PSD of progressively activated carbons obtained from their supercritical methane isotherms

Cited by 9 publications

References 10 publications

Micropore Size Distributions of Activated Carbons and Carbon Molecular Sieves Assessed by High-Pressure Methane and Carbon Dioxide Adsorption Isotherms

Micropore Size Distributions of Activated Carbons and Carbon Molecular Sieves Assessed by High-Pressure Methane and Carbon Dioxide Adsorption Isotherms

Development and Validation of Pore Structure Models for Adsorption in Activated Carbons

Calculation of Pore Size Distributions of Activated Carbons from Adsorption Isotherms

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