Effect of the adsorption isotherm on one- and two-component diffusion in activated carbon

Linders, M.J.G.; Broeke, L.J.P. van den; Bokhoven, J.J.G.M. van; Duisterwinkel, A.E.; Kapteijn, Freek; Moulijn, Jacob A.

doi:10.1016/s0008-6223(97)00095-x

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…The chemical potential gradient can be related to the gradient of fractional occupancy by a thermodynamic factor Γ . For the ADA model the thermodynamic factor Γ is When t = 2, eq reduces to the thermodynamic factor derived by Linders et al for the DR model.…”

Section: Model Developmentmentioning

confidence: 99%

Adsorption and Surface Diffusion of Supercritical Methane in Shale

Ren

Tian

et al. 2017

Ind. Eng. Chem. Res.

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The primary objective of this study is to investigate the adsorption and surface diffusion of supercritical methane in shale. An adaptive Dubinin–Astakhov (ADA) model, with a term taking the adsorbed phase density, was introduced to interpret measured excess adsorption isotherms and obtain temperature-independent characteristic curves. The ADA model can also predict adsorption isotherms at different temperatures. Combining with the ADA model and the Maxwell–Stefan equation, a new model was developed to describe the surface diffusion of supercritical methane in shale. The model was successfully validated against experimental data. We also studied the effect of fugacity and temperature on the surface diffusion. With increasing temperature, the surface diffusion flux reaches a maximum and then decreases, which is the result of a trade off between the amount adsorbed and the effective Maxwell–Stefan surface diffusivity. The driving force for surface diffusion is the chemical potential gradient, which can be related to the gradient of fractional occupancy by a thermodynamic factor. The absolute adsorption isotherms of supercritical methane in shale are of Type I in the IUPAC classification scheme. At high feed fugacity, the adsorbed concentration at feed side approaches saturation. Further increasing the feed fugacity can hardly increase the driving force for the surface diffusion. But increasing temperature can increase the effective Maxwell–Stefan surface diffusivity, which leads to the increase of the surface diffusion flux.

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Section: Model Developmentmentioning

confidence: 99%

Adsorption and Surface Diffusion of Supercritical Methane in Shale

Ren

Tian

et al. 2017

Ind. Eng. Chem. Res.

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“…Although only one porous Si sensor was implanted in the carbon bed, the small form factor of the device allows designs in which several sensors can be placed at different carbon bed positions. Such a configuration should enable real-time, low power detection and it may also prove useful in modeling the diffusion of organic compounds through activated carbon [10,34,35] and in developing models of gas-solid diffusion [36] to better understand adsorption phenomena.…”

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confidence: 99%

Optical‐Fiber‐Mounted Porous Silicon Photonic Crystals for Sensing Organic Vapor Breakthrough in Activated Carbon

et al. 2007

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“…This conclusion conforms to the findings and conclusions of previous studies regarding the utility of natural zeolites and activated and/or synthetic zeolites for comparative adsorption studies (Doula, 2006;Pitcher et al, 2004;Taffarel and Rubio, 2009). Besides, the adsorptive competition between the adsorbates, which was expected from an IAS system, might have resulted in some inhibitive adsorption on to the surface and porous cavities of the zeolites (Amosa et al, 2014b;Linders et al, 1997;Motsi et al, 2009;Pitcher et al, 2004;Richter et al, 1989;Ruthven et al, 1973). The natural zeolites usually characterized with lower surface areas and ion-exchanging capacity are more affected by these competing ions when compared with the synthetic zeolites.…”

Section: Resultsmentioning

confidence: 99%

Optimization of Manganese Reduction in Biotreated POME onto 3A Molecular Sieve and Clinoptilolite Zeolites

Jami

Rosli²,

Amosa³

2016

Water Environment Research

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Availability of quality-certified water is pertinent to the production of food and pharmaceutical products. Adverse effects of manganese content of water on the corrosion of vessels and reactors necessitate that process water is scrutinized for allowable concentration levels before being applied in the production processes. In this research, optimization of the adsorption process conditions germane to the removal of manganese from biotreated palm oil mill effluent (BPOME) using zeolite 3A subsequent to a comparative adsorption with clinoptilolite was studied. A face-centered central composite design (FCCCD) of the response surface methodology (RSM) was adopted for the study. Analysis of variance (ANOVA) for response surface quadratic model revealed that the model was significant with dosage and agitation speed connoting the main significant process factors for the optimization. R(2) of 0.9478 yielded by the model was in agreement with predicted R(2). Langmuir and pseudo-second-order suggest the adsorption mechanism involved monolayer adsorption and cation exchanging.

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Effect of the adsorption isotherm on one- and two-component diffusion in activated carbon

Cited by 13 publications

References 10 publications

Adsorption and Surface Diffusion of Supercritical Methane in Shale

Adsorption and Surface Diffusion of Supercritical Methane in Shale

Optical‐Fiber‐Mounted Porous Silicon Photonic Crystals for Sensing Organic Vapor Breakthrough in Activated Carbon

Optimization of Manganese Reduction in Biotreated POME onto 3A Molecular Sieve and Clinoptilolite Zeolites

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