Physical adsorption of gases at high pressure

Wakasugi, Yuji; Ozawa, Sentaro; Ogino, Yoshisada

doi:10.1016/0021-9797(81)90091-6

Cited by 90 publications

(33 citation statements)

References 10 publications

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“…Some of the adsorption data were obtained from literature and some others were obtained by conducting CO 2 adsorption experiment using our new apparatus set up. Figure 3 shows the CO 2 Adsorption on Zeolite (Linde 5A) at 50 o C, conducted by Wakasugi [10]. The information of its Nitrogen BET Surface area is 494 m 2 /g.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

A Simple Technique for Surface Area Determination Through Supercritical Co2 Adsorption

Sudibandriyo¹

2010

MST

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“…33 Others have also observed this maximum in their investigation. [34][35][36][37][38][39][40][41] This behavior has prompted many researches into the various theories to explain this maximum. Tables II and III show the various theoretical approaches pursued by many researchers, with Table II listing works dealing with empirical and semiempirical approaches and Table III for works dealing with molecular simulation approaches and theories that have basis in molecular interactions.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of argon from sub- to supercritical conditions on graphitized thermal carbon black and in graphitic slit pores: A grand canonical Monte Carlo simulation study

2005

The Journal of Chemical Physics

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Grand canonical Monte Carlo simulation of argon adsorption at the surface of silica nanopores: Effect of pore size, pore morphology, and surface roughness J. Chem. Phys. 120, 2913 (2004) In this paper we consider the adsorption of argon on the surface of graphitized thermal carbon black and in slit pores at temperatures ranging from subcritical to supercritical conditions by the method of grand canonical Monte Carlo simulation. Attention is paid to the variation of the adsorbed density when the temperature crosses the critical point. The behavior of the adsorbed density versus pressure ͑bulk density͒ shows interesting behavior at temperatures in the vicinity of and those above the critical point and also at extremely high pressures. Isotherms at temperatures greater than the critical temperature exhibit a clear maximum, and near the critical temperature this maximum is a very sharp spike. Under the supercritical conditions and very high pressure the excess of adsorbed density decreases towards zero value for a graphite surface, while for slit pores negative excess density is possible at extremely high pressures. For imperfect pores ͑defined as pores that cannot accommodate an integral number of parallel layers under moderate conditions͒ the pressure at which the excess pore density becomes negative is less than that for perfect pores, and this is due to the packing effect in those imperfect pores. However, at extremely high pressure molecules can be packed in parallel layers once chemical potential is great enough to overcome the repulsions among adsorbed molecules.

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“…However, we have not yet shown that these data were under conditions Here we consider a new way of obtaining surface area based on Eq. [6]. This way is unusual because it does not where the assumptions leading to Eq.…”

Section: Lattice Theory Predictions Of Monolayermentioning

confidence: 91%

“…It follows from Eq. [6] that sented in Tables 1 and 2 do not rely on any of the assumptions in the derivation of the model. In this case, the model can verify the interpretation of the data, but the interpretation r 0 Å (a m /S) 3/2 /1.075.…”

Section: Lattice Theory Predictions Of Monolayermentioning

confidence: 99%

See 1 more Smart Citation

Determining Surface Areas from Linear Adsorption Isotherms at Supercritical Conditions

Aranovich

Donohue

1997

Journal of Colloid and Interface Science

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Physical adsorption of gases at high pressure

Cited by 90 publications

References 10 publications

A Simple Technique for Surface Area Determination Through Supercritical Co2 Adsorption

A Simple Technique for Surface Area Determination Through Supercritical Co2 Adsorption

Adsorption of argon from sub- to supercritical conditions on graphitized thermal carbon black and in graphitic slit pores: A grand canonical Monte Carlo simulation study

Determining Surface Areas from Linear Adsorption Isotherms at Supercritical Conditions

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