Effect of adsorbate size on adsorption of gas mixtures on homogeneous adsorbents

Sircar, Shivaji; Rao, Meera

doi:10.1002/aic.690451223

Cited by 11 publications

(5 citation statements)

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“…Equation can be analytically derived by applying the concept of ideal adsorbed solution in the GSE framework while using the pure gas GSE isotherms (eq ) for the components of the mixture. , Thus, eqs and are thermodynamically consistent. The validity of eq to describe a binary GSE isotherm, when the pure gas GSE isotherms of the components follow eq , has been experimentally demonstrated. ,, …”

Section: Binary Gas Adsorption Isothermmentioning

confidence: 99%

“…The validity of eq 15 to describe a binary GSE isotherm, when the pure gas GSE isotherms of the components follow eq 14, has been experimentally demonstrated. 25,28,29 It should be noted that the adsorption literature often presents the SSL isotherm models for pure and binary gas adsorption in terms of AAA as variables by simply replacing n i m with n i a in eqs 14 and 15. They are then used to fit the raw experimental adsorption isotherm data.…”

Section: ■ Binary Gas Adsorption Isothermmentioning

confidence: 99%

“…Many published pure gas GSE isotherms on homogeneous adsorbents can be empirically described very well by eqs and . − A few examples are listed in Table .…”

Section: Artificiality Of Aaa Derived From Gsementioning

confidence: 99%

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Comments on the Artificiality of Actual Amount Adsorbed

Sircar

2018

Ind. Eng. Chem. Res.

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The artificiality of the actual amount adsorbed (AAA) estimated from the experimentally measured Gibbsian surface excess (GSE) of a gas is discussed. The use of AAA for calculation of isosteric heat of adsorption or mixed gas adsorption isotherms using ideal adsorbed solution theory can be misleading and incorrect. The GSE, on the other hand, can be unambiguously used to describe all practical aspects of adsorption science and technology.

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Section: Binary Gas Adsorption Isothermmentioning

confidence: 99%

Section: ■ Binary Gas Adsorption Isothermmentioning

confidence: 99%

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Comments on the Artificiality of Actual Amount Adsorbed

Sircar

2018

Ind. Eng. Chem. Res.

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Section: Surface Nonuniformity Of Adsorbents and Their Selectivity Of...mentioning

confidence: 99%

“…Except for Z1200, all the adsorbents showed a decrease in the CO 2 /CO, CO 2 /N 2 , and CO 2 /H 2 selectivity factors with equilibrated pressures, although the extent of such a decrease depended strongly on the sorbents (Figure 7 and Table 2), indicating energetically heterogeneous surfaces [4,69,70]. The Z1200, for which the selectivity factors increased at loadings below 2.5 bar and then remained constant, is characterized by energetically homogeneous surfaces [4,69,70]. This exceptional case is consistent not only with the isotherms in Figure 6 that are a linear function of pressure even for CO 2 with the greatest α and q m values but also with the constant ∆H value at whole loadings of CO 2 (Figure 11), as discussed earlier.…”

Section: Surface Nonuniformity Of Adsorbents and Their Selectivity Of...mentioning

confidence: 99%

Adsorption of CO2, CO, H2, and N2 on Zeolites, Activated Carbons, and Metal-Organic Frameworks with Different Surface Nonuniformities

Kim

2023

Sustainability

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The single-component adsorption of CO2, CO, N2, and H2 at 25 and 35 °C was studied using microporous faujasite-framework zeolites (NaY and NaX), activated carbons (GCN and MSP), and metal–organic frameworks (A100 and Z1200) as starting points for the separation of CO2 from syngases produced by gasifying biomass-based solid wastes. The indicated adsorption isotherms and uptake of the adsorbates strongly depended on the adsorbates themselves as well as on the adsorbents because of significant differences in the surface features, such as surface nonuniformity, and in the molecular properties. The selectivity of CO2 to the other gases also varied with the adsorbents due to the distinctive energetic characteristics. The surfaces of the zeolites were the most energetically heterogeneous ones, yielding higher CO2 uptake at low pressures, while the two activated carbons and A100 had moderate surface heterogeneities, and MSP showed the highest CO2 uptake at high pressures, such as 6 bar, at which the micropore volume and surface area are important. Z1200, which has highly homogeneous surfaces and no high-affinity-binding sites, exhibited the lowest CO2 adsorption capacity regardless of equilibrated pressure. The surface nonuniformities of the six sorbents were consistent with the calculated isosteric heats of CO2 adsorption. CO2 could be reversibly adsorbed on NaY and MSP but not on GCN, with some metal impurities, although all these adsorbents showed a fully reversible process for CO adsorption. The estimated working capacity for CO2 adsorption at 25 °C was 0.78–6.50 mmol/g, depending on the sorbents used. The highest value was disclosed for MSP, the surface energetic heterogeneity of which was between that of zeolites and Z1200. Such a high working capacity bodes well for use in our later applications.

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Comments on practical use of Langmuir gas adsorption isotherm model

Sircar

2016

Adsorption

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Effect of adsorbate size on adsorption of gas mixtures on homogeneous adsorbents

Cited by 11 publications

References 11 publications

Comments on the Artificiality of Actual Amount Adsorbed

Comments on the Artificiality of Actual Amount Adsorbed

Adsorption of CO2, CO, H2, and N2 on Zeolites, Activated Carbons, and Metal-Organic Frameworks with Different Surface Nonuniformities

Comments on practical use of Langmuir gas adsorption isotherm model

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