Water vapor adsorption by activated carbon: a modification to the isotherm model of Do and Do

Neitsch, M.; Heschel, Wolfgang; Suckow, M.

doi:10.1016/s0008-6223(01)00077-x

Cited by 36 publications

(24 citation statements)

References 5 publications

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“…In a way, then, K f expresses the thermodynamic stability of the H 2 O-primary site bond with respect to that of the H 2 O-H 2 O bond, and it is a reflection of the distribution of oxygen functionalities of varying acid character over the carbon surface. The values obtained for this constant (Table 2) are similar to that reported for active carbon granules [12].…”

Section: Water Adsorption Isothermssupporting

confidence: 85%

“…In such a model the number of water molecules forming the detachable clusters was fixed at five. A recent modification of the model [12] permits a higher refinement in the curve fitting by having using the number of water molecules in the clusters as a fitting parameter. This model is the called CIMF isotherm (cluster formation induced micropore filling) which is represented by the following equation:…”

Section: N-butane Adsorption Isothermsmentioning

confidence: 99%

“…(2). Neitsch et al [12] consider that the baptism by fire of Eq. (2) would be to test its applicability for highly oxidised carbons.…”

Section: Water Adsorption Isothermsmentioning

confidence: 99%

See 2 more Smart Citations

Co-adsorption of n-butane/water vapour mixtures on activated carbon fibre-based monoliths

Marbán

Fuertes

2004

Carbon

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Section: Water Adsorption Isothermssupporting

confidence: 85%

Section: N-butane Adsorption Isothermsmentioning

confidence: 99%

See 1 more Smart Citation

Co-adsorption of n-butane/water vapour mixtures on activated carbon fibre-based monoliths

Marbán

Fuertes

2004

Carbon

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“…Neitsch et al [14] generalized the DD model assuming that the number of water molecules forming a cluster (i.e., the micropore filling by the m-mers) can be optional. This assumption leads to the final version of the adsorption isotherm equation,…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Do–Do model of water adsorption on carbons

Furmaniak¹,

Gauden²,

Terzyk³

et al. 2005

Journal of Colloid and Interface Science

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“…Several modifications to the DD isotherm model [154] have been presented in the literature to describe water adsorption on carbon [142,143,155,156]. Do et al [142] have extended the DD model to describe the adsorption and desorption branches of water adsorption in activated carbon.…”

Section: Water Adsorption In Carbon Materialsmentioning

confidence: 99%

Adsorption analysis of carbon dioxide, hydrocarbons and moisture on carbon

Abadi¹

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This thesis presents a fundamental investigation on the role of the structure of microporous silicon carbide-derived carbon (SiCDC) and its functionalisation in the adsorption equilibria and transport of gases. The SiCDCs with different particle size distributions were synthesized in our laboratory and characterized using a combination of techniques including scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Xray diffraction (XRD), helium pycnometry, thermogravimetric analyses (TGA), nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), Raman spectroscopy, and gas adsorption.Based on the characterisation results, a bidisperse pore structure model is proposed for the synthesized SiCDC to explain the kinetics. In the mathematical modelling of adsorption kinetics, the internal structure of SiCDC is assumed to have ultra-microporous grains with larger particle scale micropores forming the intergrain pathways. It is shown that CH 4 adsorption kinetics is governed by two distinct diffusional resistances, arising from slow grain scale diffusion in ultra-micropores and faster particle scale diffusion in large micropores. For CO 2 , it is found that the adsorption kinetics is strongly influenced by a barrier resistance at the grain surface where entry into the ultra-microporosity occurs. The uptake of CO 2 in the bidisperse pore structure of CDCs occurs through rapid diffusion in the large particle-scale micropores, in which a Henry law isotherm holds, and a combination of barrier resistance at the grain surface and diffusional resistance in the grain interior with a Langmuirian isotherm. It is shown that the grain scale activation energies are comparable with values for carbon molecular sieves, and consistent with values expected for the size range of the ultra-micropores, while the activation energies for transport in the larger particle scale micropores are comparable to those for conventional activated carbons.The experimental uptake-based data are compared with self-diffusivities obtained through equilibrium molecular dynamics (EMD) simulations using a realistic model of SiCDC developed by the hybrid reverse Monte Carlo (HRMC) method. It is observed that MD-based CO 2 diffusivities are as much as two orders of magnitude larger than the CO 2 particle scale diffusion coefficients, however such discrepancy is not found for The findings of this thesis should aid better understanding of the gas adsorption and diffusion mechanism in microporous CDCs.iv

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Water vapor adsorption by activated carbon: a modification to the isotherm model of Do and Do

Cited by 36 publications

References 5 publications

Co-adsorption of n-butane/water vapour mixtures on activated carbon fibre-based monoliths

Co-adsorption of n-butane/water vapour mixtures on activated carbon fibre-based monoliths

Heterogeneous Do–Do model of water adsorption on carbons

Adsorption analysis of carbon dioxide, hydrocarbons and moisture on carbon

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