High-Pressure Gravimetric Measurements for Binary Gas Adsorption Equilibria and Comparisons with Ideal Adsorbed Solution Theory (IAST)

Yang, Xiaoxian; Sadeghi Pouya, Ehsan; Xiao, Gongkui; Richter, Markus; May, Eric F.

doi:10.1021/acs.langmuir.3c01569

Langmuir

2023

DOI: 10.1021/acs.langmuir.3c01569

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High-Pressure Gravimetric Measurements for Binary Gas Adsorption Equilibria and Comparisons with Ideal Adsorbed Solution Theory (IAST)

Xiaoxian Yang,

Ehsan Sadeghi Pouya,

Gongkui Xiao

et al.

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Cited by 3 publications

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Validated methane adsorption isotherms up to 7.5 MPa on a reference Na-Y zeolite at near ambient temperatures

Rea,

Tavitian,

Broom

et al. 2024

Adsorption

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Reference gas adsorption isotherms are useful for validating equilibrium data obtained from various techniques and for ensuring that experimental systems are operating correctly. In this work, we extend an interlaboratory study on a NIST reference zeolite (Na-Y, RM8850) to two additional temperatures above and below the original 298.15 K, validating the results via independent measurements using two different techniques. Volumetric experiments on a novel Adsorption Differential Volumetric Apparatus (ADVA-270) were carried out at The University of Edinburgh, and gravimetric experiments were performed at Hiden Isochema using a proprietary XEMIS microbalance. Both techniques provided highly accurate results and an excellent match between the two independent measurements using less than 150 mg of sample. Absolute equilibrium data were modelled using a Langmuir-virial isotherm to obtain an accurate concentration dependence of the heat of adsorption.

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Validated methane adsorption isotherms up to 7.5 MPa on a reference Na-Y zeolite at near ambient temperatures

Rea,

Tavitian,

Broom

et al. 2024

Adsorption

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The Magnetic Suspension Balance: 40 Years of Advancing Densimetry and Sorption Science

Yang,

Kleinrahm,

McLinden

et al. 2023

Int J Thermophys

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This paper reviews the 40-year evolution and application of the magnetic suspension balance (MSB) and discusses some challenging issues of the technique. An MSB, as defined herein, is a magnetic suspension coupling (MSC) connected to an analytical balance. With an MSC, an object can be weighed in a different environment than the balance itself, making it possible for contactless weighing. Over the past 40 years, the MSB has been commonly used in research areas requiring accurate object weighings, notably gas density measurements by MSB-based densimeters and gas adsorption measurements by MSB-based sorption analyzers. More than 15 MSB-based densimeters have been built to date; these are generally called two-sinker densimeter and single-sinker densimeter. They have produced highly accurate density data of many pure fluids and fluid mixtures. These data serve as the basis for the development of reference equations of state, which play an essential role in various industrial and scientific areas. Moreover, such systems are central to the metrology program of many countries. The MSB technique is also very successful in adsorption science: more than 85 MSB-based sorption analyzers have been set up in over 20 countries. The number of new MSB-based sorption analyzers, and peer-reviewed publications resulting from them, are both increasing exponentially since 2004. They have produced highly reliable gas adsorption data at high pressures for many applications, mainly in the energy and environmental sectors. Although further development of innovative instruments based on the MSB is threatened by the proprietary nature of MSB technology, the development will continue, e.g., toward cryogenic measurements and a more compact design.

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Binary Adsorption Equilibria of Three CO₂+CH₄ Mixtures on NIST Reference Zeolite Y (RM 8850) at Temperatures from 298 to 353 K and Pressures up to 3 MPa

Wedler,

Ferre,

Azzan

et al. 2024

J. Chem. Eng. Data

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Adsorption equilibria of CO2, CH4, and their mixtures were measured on binderless pellets of NIST reference zeolite NaY (RM 8850) using a static gravimetric setup. The unary adsorption isotherms are reported at temperatures from 298 to 393 K up to a pressure of 3 MPa and compare favorably with independent results on RM 8850 powder. The competitive adsorption measurements were performed at temperatures from 298 to 353 K and up to 3 MPa for three premixed gas mixtures with CO2 molar feed compositions of 0.25, 0.50, and 0.75. The results constitute the first competitive adsorption dataset reported for any of the NIST reference materials. RM 8850 shows a strong selectivity for CO2 adsorption toward CH4. The experimental unary and binary adsorption isotherms are accurately modeled using the simplified statistical isotherm model (SSI). Notably, the agreement with the model improves only slightly (and within experimental uncertainties) when the whole dataset is used for parameter fitting as opposed to only using the unary data.

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High-Pressure Gravimetric Measurements for Binary Gas Adsorption Equilibria and Comparisons with Ideal Adsorbed Solution Theory (IAST)

Cited by 3 publications

References 53 publications

Validated methane adsorption isotherms up to 7.5 MPa on a reference Na-Y zeolite at near ambient temperatures

Validated methane adsorption isotherms up to 7.5 MPa on a reference Na-Y zeolite at near ambient temperatures

The Magnetic Suspension Balance: 40 Years of Advancing Densimetry and Sorption Science

Binary Adsorption Equilibria of Three CO₂+CH₄ Mixtures on NIST Reference Zeolite Y (RM 8850) at Temperatures from 298 to 353 K and Pressures up to 3 MPa

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High-Pressure Gravimetric Measurements for Binary Gas Adsorption Equilibria and Comparisons with Ideal Adsorbed Solution Theory (IAST)

Cited by 3 publications

References 53 publications

Validated methane adsorption isotherms up to 7.5 MPa on a reference Na-Y zeolite at near ambient temperatures

Validated methane adsorption isotherms up to 7.5 MPa on a reference Na-Y zeolite at near ambient temperatures

The Magnetic Suspension Balance: 40 Years of Advancing Densimetry and Sorption Science

Binary Adsorption Equilibria of Three CO2+CH4 Mixtures on NIST Reference Zeolite Y (RM 8850) at Temperatures from 298 to 353 K and Pressures up to 3 MPa

Contact Info

Product

Resources

About

Binary Adsorption Equilibria of Three CO₂+CH₄ Mixtures on NIST Reference Zeolite Y (RM 8850) at Temperatures from 298 to 353 K and Pressures up to 3 MPa