Multilayer Adsorption of Gases on Heterogeneous Solid Surfaces

Rudziński, W.; Sokołowski, Stefan; Jaroniec, M.; Tóth, J.

doi:10.1515/zpch-1975-25636

Cited by 69 publications

(118 citation statements)

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“…the Langmuir, BET and DubininRadushkevitch equations (Rudziński and Everett 2000), involve a parameter interpreted as an adsorptive reference state pressure which enables the calculation of the relative pressure or fugacity of the adsorbate. Provided that the measurement temperature is far below the critical temperature of the adsorptive, the saturated vapour pressure is usually chosen with this aim in mind (Rudziński and Everett 1992;Flory 1953). However, such a choice is not possible when adsorption occurs near to and above the critical temperature.…”

Section: Introductionmentioning

confidence: 99%

High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO₂ and CH₄ Adsorption

Milewska-Duda

Duda

2007

Adsorption Science & Technology

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This paper presents a set of high-accuracy formulae enabling the evaluation of the compression factor, activity and cohesion energy of fluids at near-critical and super-critical temperatures, with reduced molar volumes ranging from 0.4. Such data are necessary in BET-like theoretical modelling of adsorption process.The proposed fluid state equation (PVT relationship) combines a theoretical description of the fluid entropy (based on a hard-sphere model) with cohesion energy relationships obtained via high-accuracy approximations of universal compression factor data and vapour-liquid equilibria. The resultant relationships are incorporated into a BET-like description of adsorption in materials of irregular microporous structure (LBET model).The set of formulae gathered together in this paper allows the possible effective calculation of adsorption isotherms at near-and super-critical temperatures relative to the pore structures. A multi-variant fitting of the LBET model to the empirical data is proposed to detect active constraints for multilayer adsorption and, hence, to obtain information on the structure of the pores.Application of the formulae to the analysis of methane and carbon dioxide adsorption onto an active carbon is discussed.

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Section: Introductionmentioning

confidence: 99%

High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO₂ and CH₄ Adsorption

Milewska-Duda

Duda

2007

Adsorption Science & Technology

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“…1998;Rudzinski,Everett 1992 that calculates the coverage of adsorbed molecules on a surface with respect to 31 pressure, at a fixed temperature (Langmuir 1918) and assumes an energetically 32 homogenous surface. 33…”

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confidence: 99%

Supercritical hydrogen adsorption in nanostructured solids with hydrogen density variation in pores

et al. 2013

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“…We have assumed that adsorption constants may have different values for different silanol groups. Assuming Gaussian-like distribution of adsorption energy (binding constants) and applying the the 2-pK TLM one arrives at the following expressions (heaving the form of Langmuir-Freundlich isotherms) for mean surface coverage by i-th adsorption complex (Rudzinski et al 1999;Rudzinski and Everett 1992):…”

Section: Theorymentioning

confidence: 99%

The influence of energetic surface heterogeneity on proton desorption during capillary filling of silica nanochannels

Piasecki

Charmas

2013

Adsorption

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We applied the surface complexation model to describe the deprotonation of silica nanochannel walls as a function of pH and ionic strength of filling solution. We took into account energetic heterogeneity of silanol groups. We found that more heterogeneous walls of silica nanochannel will be more charged and can interact more strongly with ionic solutes. The modeling of nanochannels coated with 3-cyanopropydimethylchlorosilane is uncertain because charging mechanism of coated silica should take into account increased autolysis of interfacial water.

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Multilayer Adsorption of Gases on Heterogeneous Solid Surfaces

Cited by 69 publications

References 0 publications

High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO₂ and CH₄ Adsorption

High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO₂ and CH₄ Adsorption

Supercritical hydrogen adsorption in nanostructured solids with hydrogen density variation in pores

The influence of energetic surface heterogeneity on proton desorption during capillary filling of silica nanochannels

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Multilayer Adsorption of Gases on Heterogeneous Solid Surfaces

Cited by 69 publications

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High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO2 and CH4 Adsorption

High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO2 and CH4 Adsorption

Supercritical hydrogen adsorption in nanostructured solids with hydrogen density variation in pores

The influence of energetic surface heterogeneity on proton desorption during capillary filling of silica nanochannels

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High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO₂ and CH₄ Adsorption

High-Accuracy PVT Relationships for Compressed Fluids and Their Application to BET-like Modelling of CO₂ and CH₄ Adsorption