Isosteric heats of adsorption of carbon dioxide on zeolite MCM-22 modified by alkali metal cations

Zukal, Arnošt; Pawlesa, Justyna; Čejka, Jiřı́

doi:10.1007/s10450-009-9178-5

Cited by 50 publications

(37 citation statements)

References 31 publications

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“…The factors outlined above were analyzed using literature data (Zukal et al 2009) and alternatively (Burevski et al 1991).…”

Section: Purpose and Scope Of Studiesmentioning

confidence: 99%

“…In the case of the tested system of solid phase and gas, the isosteric heat of adsorption in view of a is either: a. constant (Czepirski and Jagiełło 1989;Sircar et al 1999;Stadie et al 2012), b. monotonically decreasing (Burevski et al 1991;PeraTitus 2016;Zukal et al 2009;Terzyk et al 2016;Gauden et al 2016;Kowalczyk et al 2017;Czepirski and Jagiełło 1989;Sircar et al 1999;Stadie et al 2012;Barrer and Gibbons 1963a;Guo et al 2006), c. anomalous (increase and decrease) Gauden et al 2016;Kowalczyk et al 2017;Stadie et al 2012),…”

Section: The Accepted Theoretical Dependenciesmentioning

confidence: 99%

“…Figure 6 shows this relationship (28). The intercept can be used to determine the so-called point of zero enthalpy of adsorption (proposition an analytical version of the evaluation this thermodynamic value), i.e., for a hypothetical a = 0 and entropy: Table 2 shows a comparison of the isosteric heat of adsorption calculated using the three-parameter equation for literature data (Zukal et al 2009), and Table 3 shows the results of the calculation of the isosteric entropy of adsorption.…”

Section: Three-parametric Equationmentioning

confidence: 99%

“…Studies have shown that EEC also occurs during the adsorption of low molecular weight gases on active surfaces (Burevski et al 1991;Fletcher and Thomas 2000;Garrone et al 2008;Korolev et al 2011;Hercigonja and Rakić 2013;Pera-Titus 2016;Zukal et al 2009;Kelut et al 2014), wherein the dependence isn't necessarily linear, as Eq. (1) in unequivocal manner (Fletcher and Thomas 2000;Garrone et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…(1) ΔH = T iso ΔS + ΔH iso Tested systems with repetitive features are well described, such as zeolite-CO 2 (Burevski et al 1991;Pera-Titus 2016;Zukal et al 2009;Kelut et al 2014). In (Pera-Titus 2016), the literature data show another form of EEC resulting from (1), namely:…”

Section: Introductionmentioning

confidence: 99%

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Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Mianowski

Urbańczyk

2017

Adsorption

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List of symbols AbstractThe adsorption process at near ambient temperatures indicated that the EEC (enthalpy-entropy compensation) is affected by three basic thermodynamic values: ∆H, ∆S and T. The consequence is that it is possible to determine an isosteric straight (symbol H − S) without experimental studies based on the slope coefficient T iso , which is the constant arising from the expected temperature range (about 0-60 °C). Therefore, EEC curves can be obtained by appropriate modification of the temperature range. In the case of entropy of adsorption, the decisive influence is the entropy of gas. For visualization and characterization of this impact, we proposed resolute pointer µ (Eq. 25), through which it is observed that for small values of the equilibrium vapor pressure, as P → 0, there are significant deviations from the isosteric straight H − S. The case where P → P 0 followed a gradual grouping of experimental data in accordance with the relationship with H − S. We used the three-parameter equation for exothermic processes. For the extrapolated conditions, the so-called point of zero adsorption represented the enthalpy and entropy of adsorption, whose values are analogous to previous results in the literature, which can be considered an appropriate analytical method to determine these two thermodynamic values.

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“…The factors outlined above were analyzed using literature data (Zukal et al 2009) and alternatively (Burevski et al 1991).…”

Section: Purpose and Scope Of Studiesmentioning

confidence: 99%

Section: The Accepted Theoretical Dependenciesmentioning

confidence: 99%

Section: Three-parametric Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Mianowski

Urbańczyk

2017

Adsorption

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Adsorption of Carbon Dioxide on Sodium and Potassium Forms of STI Zeolite

et al. 2012

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Sodium and potassium forms of STI zeolite synthesized with Si/Al ratios 15, 25, and 35 were characterized using X‐ray powder diffraction and nitrogen adsorption at 77 K. To obtain detailed information on the effect of alkali metal cations on CO2 adsorption, the temperature dependence of CO2 isotherms was investigated in the temperature range from 273 to 333 K. Based on these data, isosteric heats of adsorption of CO2 were determined. It was found that the isosteric heat of CO2 adsorption attains the highest values on the sodium form of STI zeolite with a Si/Al ratio of 15. The lowest values were found with both sodium and potassium forms of STI zeolite having a Si/Al ratio of 35. Heats of adsorption of CO2 obtained for STI zeolites were discussed in detail and compared with those of FER, MFI, MEL, TUN, and IMF structural types. This comparison revealed that isosteric heats of adsorption of CO2 on STI zeolites are lower by approximately 8 kJ mol−1 compared with heats of adsorption for FER, MFI, MEL, TUN, and IMF zeolites composed of the eight‐ or/and ten‐ring channel systems as well as STI zeolites. This effect was explained on the basis of stronger interaction of alkali metal cations with oxygen atoms of the zeolitic framework.

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Controlling the Adsorption Enthalpy of CO₂ in Zeolites by Framework Topology and Composition

et al. 2012

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Zeolites are often investigated as potential adsorbents for CO(2) adsorption and separation. Depending on the zeolite topology and composition (Si/Al ratio and extra-framework cations), the CO(2) adsorption heats at low coverages vary from -20 to -60 kJ mol(-1), and with increasing surface coverage adsorption heats either stay approximately constant or they quickly drop down. Experimental adsorption heats obtained for purely siliceous porous solids and for ion-exchanged zeolites of the structural type MFI, FER, FAU, LTA, TUN, IMF, and -SVR are discussed in light of results of periodic density functional theory calculations corrected for the description of dispersion interactions. Key factors influencing the stability of CO(2) adsorption complexes are identified and discussed at the molecular level. A general model for CO(2) adsorption in zeolites and related materials is proposed and data reported in literature are evaluated with regard to the proposed model.

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Isosteric heats of adsorption of carbon dioxide on zeolite MCM-22 modified by alkali metal cations

Cited by 50 publications

References 31 publications

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Adsorption of Carbon Dioxide on Sodium and Potassium Forms of STI Zeolite

Controlling the Adsorption Enthalpy of CO₂ in Zeolites by Framework Topology and Composition

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Isosteric heats of adsorption of carbon dioxide on zeolite MCM-22 modified by alkali metal cations

Cited by 50 publications

References 31 publications

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Enthalpy–entropy compensation for isosteric state adsorption at near ambient temperatures

Adsorption of Carbon Dioxide on Sodium and Potassium Forms of STI Zeolite

Controlling the Adsorption Enthalpy of CO2 in Zeolites by Framework Topology and Composition

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Controlling the Adsorption Enthalpy of CO₂ in Zeolites by Framework Topology and Composition