Adsorption of Methane, Nitrogen, Carbon Dioxide, and Their Binary Mixtures on Dry Activated Carbon at 318.2 K and Pressures up to 13.6 MPa

Sudibandriyo, Mahmud; Pan, Zhejun; Fitzgerald, J Edward; Robinson, Robert L.; Gasem, Khaled A. M.

doi:10.1021/la020976k

Cited by 284 publications

(243 citation statements)

References 14 publications

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“…It should be noted that the obtained experimental data are in Gibbs adsorption which exhibits a maximum isotherm at high pressures [9].…”

Section: Adsorption Apparatus Set Up and Measurementsmentioning

confidence: 94%

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A Simple Technique for Surface Area Determination Through Supercritical Co2 Adsorption

Sudibandriyo¹

2010

MST

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The measurement of specific surface area of porous materials has long been important in physical sciences and is currently growing in importance in applied and environmental science. Numerous systems have been developed for surface area measurement by gas adsorption. Commercial systems are available which can measure a wide range of absolute surface area with relative ease. However, their cost is often prohibitive. In this study, an inexpensive apparatus for surface area measurement has been set up to be used for measuring supercritical adsorption of CO 2 . The Ono-Kondo Lattice model was used to represent the adsorption isotherm and to determine the surface area. The results of surface area determination using CO 2 adsorption combined with OK model have been compared to the numbers obtained from nitrogen BET method. For surface area determination of zeolites and activated carbons, the new method give reasonable agreement results (within 10% deviation) compared to the results obtained from nitrogen BET method. In addition, the new method also gives more reasonable results for surface area determination of coals. As known, the nitrogen BET method gives almost zero of coals' surface area. This might due to the characteristic of the coals' structure that might be change (the pores are closed) during the cooling process in nitrogen BET method. Moreover, the new method can also be used to determine the surface area of porous materials using CO 2 adsorption data at various temperatures without sacrificing their accuracy.

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“…It should be noted that the obtained experimental data are in Gibbs adsorption which exhibits a maximum isotherm at high pressures [9].…”

Section: Adsorption Apparatus Set Up and Measurementsmentioning

confidence: 94%

“…shows the CO 2 adsorption on Calgon-Activated Carbon at 45 o C, conducted by Sudibandriyo [9]. The information from the company saying that its surface area is about 900 m 2 /g.…”

Section: Co 2 Adsorption On Activatedmentioning

confidence: 99%

A Simple Technique for Surface Area Determination Through Supercritical Co2 Adsorption

Sudibandriyo¹

2010

MST

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“…In this experiment, the main procedures can be summarized as follows: (1) the shale powder samples need to be degassed firstly by evacuation for 12 h at 100 °C; (2) leak testing should be conducted by using helium at 8 MPa for two hours, and the accepted leakage rate is less than 500 Pa/hour; (3) the void volume of the sample cell, which should be applied for the calculation of isotherms and methane adsorption amounts, was determined by helium expansion; and (4) remove the helium within the sample cell by evacuation and then perform the methane adsorption isotherm measurement. Then, the adsorption amount of methane at various pressures during the adsorption measurement was calculated through the equation [9,41]: …”

Section: Methane Adsorption Isotherms and Adsorption Rate Measurementsmentioning

confidence: 99%

Methane Adsorption Rate and Diffusion Characteristics in Marine Shale Samples from Yangtze Platform, South China

et al. 2017

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Knowledge of the gas adsorption rate and diffusion characteristics in shale are very important to evaluate the gas transport properties. However, research on methane adsorption rate characteristics and diffusion behavior in shale is not well established. In this study, high-pressure methane adsorption isotherms and methane adsorption rate data from four marine shale samples were obtained by recording the pressure changes against time at 1-s intervals for 12 pressure steps. Seven pressure steps were selected for modelling, and three pressure steps of low (~0.4 MPa), medium (~4.0 MPa), and high (~7.0 MPa) were selected for display. According to the results of study, the methane adsorption under low pressure attained equilibrium much more quickly than that under medium and high pressure, and the adsorption rate behavior varied between different pressure steps. By fitting the diffusion models to the methane adsorption rate data, the unipore diffusion model based upon unimodal pore size distribution failed to describe the methane adsorption rate, while the bidisperse diffusion model could reasonably describe most of the experimental adsorption rate data, with the exception of sample YY2-1 at high pressure steps. This phenomenon may be related to the restricted assumption on pore size distribution and linear adsorption isotherm. The diffusion parameters α and β/α obtained from the bidisperse model indicated that both macro-and micropore diffusion controlled the methane adsorption rate in shale samples, as well as the relative importance and influence of micropore diffusion and adsorption to adsorption rate and total adsorption increased with increasing pressure. This made the inflection points, or two-stage process, at higher pressure steps not as evident as at low pressure steps, and the adsorption rate curves became less steep with increasing pressure. This conclusion was also supported by the decreasing difference values with increasing pressures between macro-and micropore diffusivities obtained using the bidisperse model, which is roughly from 10 −3 to 10 0 , and 10 −3 to 10 −1 , respectively. Additionally, an evident negative correlation between macropore diffusivities and pressure lower than 3-4 MPa was observed, while the micropore diffusivities only showed a gentle decreasing trend with pressure. A mirror image relationship between the variation in the value of macropore diffusivity and adsorption isotherms was observed, indicating the negative correlation between surface coverage and gas diffusivity. The negative correlation of methane diffusivity with pressure and surface coverage may be related to the increasing degree of pore blockage and the decreasing concentration gradient of methane adsorption. Finally, due to the significant deviation between the unipore model and experimental adsorption rate data, a new estimation method based upon the bidisperse model is proposed here.

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“…For Calgon F400 activated carbon, A* is 850 m 2 /g. 43 The adsorption quantity calculated by the model is sensitive to the value of slit width H. As H was assumed to be the average pore width, in this work H was considered an adjustable parameter but set to be a fixed value for the same porous materials, and then it is independent of the adsorbed gas. ε sf was set as one more adjustable parameter for one system.…”

Section: Adsorption Isotherm Representationmentioning

confidence: 99%

“…Using the experimental data measured by Sudibandriyo and co-workers at 318.2 K, 43 the DFT model parameters were obtained and listed in Table IV with the average relative deviation 6.17%. Both the model results and experimental data are shown in Figures 7 and 8 with reasonable agreements, which implies that it is feasible to represent the adsorption of real substances with integer or non-integer segment numbers.…”

Section: Adsorption Isotherm Representationmentioning

confidence: 99%

A hybrid perturbed-chain SAFT density functional theory for representing fluid behavior in nanopores

Shen

Lü

2013

The Journal of Chemical Physics

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A hybrid perturbed-chain SAFT density functional theory for representing fluid behavior in nanopores: Mixtures J. Chem. Phys. 139, 194705 (2013) A hybrid statistical mechanical model, which is fully consistent with the bulk perturbed-chain statistical associating fluid theory (PC-SAFT) in describing properties of fluids, was developed by coupling density functional theory with PC-SAFT for the description of the inhomogeneous behavior of real chain molecules in nanopores. In the developed model, the modified fundamental measure theory was used for the hard sphere contribution; the dispersion free energy functional was represented with weighted density approximation by averaging the density in the range of interaction, and the chain free energy functional from interfacial statistical associating fluid theory was used to account for the chain connectivity. Molecular simulation results of the density profile were compared with model prediction, and the considerable agreement reveals the reliability of the proposed model in representing the confined behaviors of chain molecules in an attractive slit. The developed model was further used to represent the adsorptions of methane and carbon dioxide on activated carbons, in which methane and carbon dioxide were modeled as chain molecules with the parameters taken from the bulk PC-SAFT, while the parameters of solid surface were obtained from the fitting of gas adsorption isotherms measured experimentally. The results show that the model can reliably reproduce the confined behaviors of physically existing substances in nanopores.

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Adsorption of Methane, Nitrogen, Carbon Dioxide, and Their Binary Mixtures on Dry Activated Carbon at 318.2 K and Pressures up to 13.6 MPa

Cited by 284 publications

References 14 publications

A Simple Technique for Surface Area Determination Through Supercritical Co2 Adsorption

A Simple Technique for Surface Area Determination Through Supercritical Co2 Adsorption

Methane Adsorption Rate and Diffusion Characteristics in Marine Shale Samples from Yangtze Platform, South China

A hybrid perturbed-chain SAFT density functional theory for representing fluid behavior in nanopores

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