High‐resolution adsorption isotherms of supercritical carbon dioxide on activated carbon

Humayun, Raashina; Tomasko, David L.

doi:10.1002/aic.690461017

Cited by 138 publications

(132 citation statements)

References 41 publications

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“…However, anomalous behaviors in the near-critical region were also observed by other authors. The adsorption of CO 2 on Filtrasorb 400 activated carbon has been investigated by Tomasko and his group (Humayun and Tomasko, 2000). They found that at a temperature of 32 • C the isotherm was exhibiting a "bump" around the critical density, differently from the isotherms measured at higher temperatures, where an almost linear behavior was found in the same density range.…”

Section: Introductionmentioning

confidence: 99%

Reliable measurement of near-critical adsorption by gravimetric method

et al. 2006

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A gravimetric apparatus is used to measure the excess adsorption at high pressure. The equipment consists of a Rubotherm magnetic suspension balance, which allows to measure also the density of the fluid. In order to obtain the excess adsorbed amount, the measured weight has to be corrected with a buoyancy term, for which the density of the adsorbing fluid has to be known at each experimental conditions. Therefore the homogeneity of density in the high-pressure cell plays a fundamental role in determining the accuracy of the measured excess adsorbed amounts. This paper is intended to show the impact of the actual approach to thermostating the unit on the density distribution of the adsorbing fluid inside the high-pressure cell. Namely, by changing the inlet position of the heating fluid, large differences in the measured excess adsorption are produced. The closer to the critical point of the fluid, the R. Pini, S. Ottiger . A. Rajendran . M. Mazzotti ( ) ETH Zurich, Institute of Process Engineering,

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Section: Introductionmentioning

confidence: 99%

Reliable measurement of near-critical adsorption by gravimetric method

et al. 2006

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“…Following the work of Tomasko [22,23], the actual pore volume can be regressed from the adsorption isotherm data for CO 2 and ethane. For these near-critical systems, the excess Gibbs adsorption for a given isotherm decreases nearly linearly with bulk density beyond the Gibbs Excess maximum.…”

Section: Modification Of Slit Lengthmentioning

confidence: 99%

Sequestering Carbon Dioxide in Coalbeds

Gasem¹,

Robinson²,

Radovic³

2001

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“…A comprehensive overview on CO 2 storage in underground coal combined with the production of CH 4 is given by White et al 1 Experimental data of near supercritical CO 2 sorption on any type of material are scarce. A limited number of gravimetric, [2][3][4][5][6][7][8][9][10][11][12][13] manometric, 4,[14][15][16][17][18][19] and volumetric 20,21 studies have been published. Additional measurements are thus important.…”

Section: Introductionmentioning

confidence: 99%

“…Additional measurements are thus important. Several researchers ͑e.g., Humayun and Tomasko 11 and Pini et al 6 ͒ have expressed their concern with respect to the accuracy of supercritical CO 2 sorption determinations. The accuracy of the gravimetric method for supercritical CO 2 sorption has recently been discussed by Pini et al 6 The focus of the present article is the accuracy of the manometric method.…”

Section: Introductionmentioning

confidence: 99%

Improved manometric setup for the accurate determination of supercritical carbon dioxide sorption

Hemert

Bruining

Rudolph

et al. 2009

Review of Scientific Instruments

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An improved version of the manometric apparatus and its procedures for measuring excess sorption of supercritical carbon dioxide are presented in detail with a comprehensive error analysis. An improved manometric apparatus is necessary for accurate excess sorption measurements with supercritical carbon dioxide due to the difficulties associated with the high sensitivity of density for pressure and temperature changes. The accuracy of the apparatus is validated by a duplicate measurement and a comparison with literature data. Excess sorption and desorption of CO 2 on Filtrasorb 400 at 318.11 K up to 17 069 mole/ m 3 ͑15.474 MPa͒ were selected for this validation. The measured excess sorption maximums are 7.79Ϯ 0.04 mole/ kg at 2253 mole/ m 3 for the first sorption isotherm and 7.91Ϯ 0.05 mole/ kg at 2670 mole/ m 3 for its subsequent desorption isotherm. The sorption and desorption peaks of the duplicate experiment are 7.92Ϯ 0.04 mole/ kg at 2303 mole/ m 3 and 8.10Ϯ 0.05 mole/ kg at 2879 mole/ m 3 , respectively. Both data sets show desorption data being higher than the sorption data of the same data set. The maximum discrepancy between the desorption and sorption isotherms of one data set is 0.15 mole/kg. The discrepancy between the two excess sorption isotherms is 0.12 mole/kg or less. The a priori error of the excess sorption measurements is between 0.02 and 0.06 mole/kg. The error due to He contamination is between 0.01 and 0.05 mole/kg. The difference between the a priori uncertainty and the observed maximum discrepancies is considered to be acceptable. The sorption isotherms show identical qualitative behavior as data in the literature. The quantitative behavior is similar but the peak height and the linear decrease in excess sorption at high gas densities are 10% higher. A plot of the excess sorption versus the density can be used to obtain the sorbed phase density and the specific micropore volume. These sorbed phase densities are in excellent agreement with the data in the literature. Furthermore, the excess sorption data scaled to this specific micropore volume in this work and in the literature collapse on a single curve when plotted versus gas density.

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High‐resolution adsorption isotherms of supercritical carbon dioxide on activated carbon

Cited by 138 publications

References 41 publications

Reliable measurement of near-critical adsorption by gravimetric method

Reliable measurement of near-critical adsorption by gravimetric method

Sequestering Carbon Dioxide in Coalbeds

Improved manometric setup for the accurate determination of supercritical carbon dioxide sorption

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