Gas Adsorption on Zeolites at High Pressure

Vermesse, J.; Vidal, and D.; Malbrunot, P.

doi:10.1021/la950283m

Cited by 55 publications

(43 citation statements)

References 16 publications

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“…They reach the same asymptote, having a slope of −15. This means that the limit of the difference between the average density of the adsorbed phase and the bulk gas density is proportional to 1/ 15 . We have addressed the basic features of adsorption of supercritical fluids and their differences from that of subcritical fluids for an open graphite surface.…”

Section: Effects Of Temperaturementioning

confidence: 99%

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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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Section: Effects Of Temperaturementioning

confidence: 99%

“…Their first report using this instrument presented isotherms over a range of pressure up to 650 MPa. 14,15 This report was later corrected 16 because of the use of incorrect solid volume in their previous work. Recently the magnetic suspension balance was applied to study high-pressure adsorption with good success.…”

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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“…Volumetric methods are based on material balance and Boyle's law, and they could be performed in the laboratory with a minimal cost by use of crushed samples or, more recently, by use of disk-shaped (plug) samples. The description of volumetric methods by use of crushed sample has been given in the literature by numerous authors; see, for example, Reich et al (1980), Mavor et al (1990), Hall (1993), Vermesse et al (1996), Zhou et al (2001), Krooss et al (2002, and Sudibandriyo et al (2003). Fundamentally, the measurements involve multiple pressure steps of gas expansion in a measurement cell that holds the sample and the associated gas uptake by the sample; see Fig.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Measurement of Sorption Isotherm Under Confining Stress With Pore-Volume Effects

Santos

Akkutlu

2013

SPE Journal

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For unconventional gas resources such as coal and organic-rich shale, sorbed phase is an important component of storage and transport calculations. Routine measurements of sorption are, however, performed separately from the porosity and permeability measurements. In this work, a new gas-storage measurement technique is proposed that combines the porosity and sorption measurements. Because the measurement is performed by use of core plugs under confining stress, it allows investigating the storage capacity for varying effective stress and incorporating the storage data into a subsequent permeability measurement under the same conditions.During the construction of the sorption isotherm in the laboratory with the volumetric (gas expansion) method, at each pressure step, the sorbed gas taken up by the sample reduces the pore volume (PV) of the sample. As a result, the initially determined PV at low pressure must be corrected at the beginning and at the end of the pressure step. This correction can be performed relatively easily during the routine sorption measurements with the crushed samples; however, it is a challenging task with core plugs under confining stress because at each pressure step the PV could also change as a result of pore compressibility. Our approach is based on a new analytical model of total gas storability developed to interpret the measured multiple-step pressure data on a graphical domain in which the storage-parameter estimation can be performed fast and accurately with a straight line. The approach considers both the compressibility and the sorbed-phase effects on the porosity and the sorption parameters.Experimental storage data of shale and coal samples with varying total organic content (TOC) and maturity are used to demonstrate the applicability of the analytical method to the measurements. The results show that the sorption measurements can be performed with increased accuracy and relatively fast. The

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“…A dashed line is used when T r is above the T CAR for 5A zeolite (Loughlin and Abouelnasr 2009) for the given species Adsorption (2015) 21:307-320 309 the rest of the isotherms. The methane isotherm from Vermesse et al (1996) study is measured at pressures up to 500 MPa. This paper is unique in its pressure range for a laboratory scale study.…”

Section: Resultsmentioning

confidence: 99%

Saturation loadings on 13X (faujasite) zeolite above and below the critical conditions. Part I: alkane data evaluation and modeling

Mousa¹,

Abouelnasr

Loughlin

2015

Adsorption

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The saturation loadings for subcritical adsorption of n-, iso-and neo alkanes C 1 -C 8 in 13X zeolite are modeled using the modified Rackett model of Spencer and Danner (J Chem Eng Data 17:236-240, 1972) for the saturated liquid densities combined with crystallographic data for the 13X zeolite. For validation of this model, alkane adsorption data in the literature is first critically evaluated and then compared to the model. The saturation loading of each isotherm that approaches saturation is extracted from the data. Log-log plots are used to determine whether each isotherm is near saturation; isotherms that exhibit a ðo ln qÞ ð = o ln pÞ slope of zero at their maximum pressure point are assumed to be saturated. Isotherms not fulfilling this criterion are deemed unsaturated and not considered further. The theoretical equation satisfactorily models the available experimental data for the n-alkanes. However, steric factors are required for the model to fit iso alkanes and neo-pentane. For supercritical temperatures, no model presently exists to explain the data. However, the data are satisfactorily modeled with an equation of the form q max = 8.5 ± 2.5 g/100 g.

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Gas Adsorption on Zeolites at High Pressure

Cited by 55 publications

References 16 publications

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

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

Laboratory Measurement of Sorption Isotherm Under Confining Stress With Pore-Volume Effects

Saturation loadings on 13X (faujasite) zeolite above and below the critical conditions. Part I: alkane data evaluation and modeling

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