Determination of the Adsorbed Phase Volume and Its Application in Isotherm Modeling for the Adsorption of Supercritical Nitrogen on Activated Carbon

Zhou, Li; Zhou, Yaping; Bai, Shupei; Lü, Changzhong; Yang, Bin

doi:10.1006/jcis.2001.7514

Cited by 45 publications

(44 citation statements)

References 13 publications

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“…It is obvious that the sorption amount decreases with increasing temperature. Other groups also reported that the sorption of gas on coals at a given pressure increases with decreasing temperature (Menon 1968;White et al 2005;Zhou et al 2001).…”

Section: Absolute Sorption and Bulk Densitymentioning

confidence: 92%

“…They have applied different approaches to describe how sorption capacity, sorption rate, gas diffusion, and permeability are affected. Several groups reported that the sorption of gas on coals at a given pressure increases with decreasing temperature (Azmi et al 2006;Menon 1968;White et al 2005;Zhou et al 2001), but the temperature effect on the maximum sorption capacity was controversial (Sakurovs et al 2010), nor was the temperature effect quantified. Major challenges for ECBM lie in the fact that the density of the adsorbed phase within varying pores is unknown and fundamental understanding of the sorption mechanism is insufficient.…”

Section: Introductionmentioning

confidence: 99%

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Molecular simulation studies of hydrocarbon and carbon dioxide adsorption on coal

et al. 2015

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Sorption isotherms of hydrocarbon and carbon dioxide (CO 2 ) provide crucial information for designing processes to sequester CO 2 and recover natural gas from unmineable coal beds. Methane (CH 4 ), ethane (C 2 H 6 ), and CO 2 adsorption isotherms on dry coal and the temperature effect on their maximum sorption capacity have been studied by performing combined Monte Carlo (MC) and molecular dynamics (MD) simulations at temperatures of 308 and 370 K (35 and 97°C) and at pressures up to 10 MPa. Simulation results demonstrate that absolute sorption (expressed as a mass basis) divided by bulk gas density has negligible temperature effect on CH 4 , C 2 H 6 , and CO 2 sorption on dry coal when pressure is over 6 MPa. CO 2 is more closely packed due to stronger interaction with coal and the stronger interaction between CO 2 molecules compared, respectively, with the interactions between hydrocarbons and coal and between hydrocarbons. The results of this work suggest that the ''a'' constant (proportional to T c 2 /P c ) in the Peng-Robinson equation of state is an important factor affecting the sorption behavior of hydrocarbons. CO 2 injection pressures of lower than 8 MPa may be desirable for CH 4 recovery and CO 2 sequestration. This study provides a quantitative understanding of the effects of temperature on coal sorption capacity for CH 4 , C 2 H 6 , and CO 2 from a microscopic perspective.

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Section: Absolute Sorption and Bulk Densitymentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Molecular simulation studies of hydrocarbon and carbon dioxide adsorption on coal

et al. 2015

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“…It decreases with increasing loading, meaning that more energetic sites for carbon dioxide, methane and nitrogen will be filled preferentially at the beginning of adsorption, so that more heat will be released, and the remaining less active sites will be filled as adsorption proceeds and less heat will be released. The isosteric enthalpies of different gases on Ac500 are approximately from 10 to 50 kJ mol -1 , which generally falls into the range of isosteric enthalpies of physisorption of CO 2 , CH 4 and N 2 on the porous adsorbent, such as activated carbon and zeolite [21,22], indicating that adsorption of these different gases on Ac500 belongs to physisorption. Isosteric enthalpies of adsorption with respect to surface loading on Ac500.…”

Section: Low Pressurementioning

confidence: 98%

Activated Carbon Preparation from Lignin by H₃PO₄ Activation and Its Application to Gas Separation

Sun¹,

Yang

Zhang

et al. 2011

Chem Eng & Technol

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Activated carbons were produced from corn straw lignin using H 3 PO 4 as activating agent. The optimal activation temperature for producing the largest BET specific surface area and pore volume of carbon was 500°C. The maximum BET specific surface area and pore volume of the resulting carbon were 820 m 2 g -1 and 0.8 cm 3 g -1, respectively. The adsorption isotherm model based on the Toth equation together with the Peng-Robinson equation of state for the determination of gas phase fugacity provide a satisfactory representation of high pressure CO 2 , CH 4 and N 2 adsorption. The kinetic adsorption results show that the breakthrough difference between CO 2 and CH 4 is not obvious, indicating that its kinetic separation performance is limited.

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“…Applying an isotherm equation tailored to monolayer adsorption mechanism, eq. (2) satisfactorily describes the experimental high-pressure adsorption isotherms available till today (Figures 3-6) [21][22][23][24] .…”

Section: Evidence Arising From Adsorption Isotherm Modelingmentioning

confidence: 80%

Impact of supercritical adsorption mechanism on research of hydrogen carrier

Sun

Zhou

et al. 2007

Chin. Sci. Bull.

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Hydrogen storage receives the worldwide attention due to its importance in sustainable energy and the solution of greenhouse effect. Adsorption provides an efficient way to compress gases and, therefore, has been applied to the development of hydrogen storage technology. However, hydrogen is a supercritical gas at the temperature of engineering interest and follows a different adsorption mechanism compared to the sub-critical gases. The present work shows why only monolayer coverage mechanism functions at above-critical temperatures and what consequences will result in the application study. Although there are pros and cons to this point of view, understanding the adsorption mechanism is, indeed, essential for the research of hydrogen storage method since it claims that any storage material based on adsorption will not satisfy the practical need of on board storage no matter how novel the material is.supercritical adsorption, mechanism, impact, hydrogen storage

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Determination of the Adsorbed Phase Volume and Its Application in Isotherm Modeling for the Adsorption of Supercritical Nitrogen on Activated Carbon

Cited by 45 publications

References 13 publications

Molecular simulation studies of hydrocarbon and carbon dioxide adsorption on coal

Molecular simulation studies of hydrocarbon and carbon dioxide adsorption on coal

Activated Carbon Preparation from Lignin by H₃PO₄ Activation and Its Application to Gas Separation

Impact of supercritical adsorption mechanism on research of hydrogen carrier

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Determination of the Adsorbed Phase Volume and Its Application in Isotherm Modeling for the Adsorption of Supercritical Nitrogen on Activated Carbon

Cited by 45 publications

References 13 publications

Molecular simulation studies of hydrocarbon and carbon dioxide adsorption on coal

Molecular simulation studies of hydrocarbon and carbon dioxide adsorption on coal

Activated Carbon Preparation from Lignin by H3PO4 Activation and Its Application to Gas Separation

Impact of supercritical adsorption mechanism on research of hydrogen carrier

Contact Info

Product

Resources

About

Activated Carbon Preparation from Lignin by H₃PO₄ Activation and Its Application to Gas Separation