The isokinetic effect as related to the activation energy for the gases diffusion in coal at ambient temperatures

Mianowski, A.; Marecka, A.

doi:10.1007/s10973-008-9059-2

Cited by 7 publications

(2 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As demonstrated by Lente in his book [42], the problem of determining kinetic parameters can lead to incorrect or unjustified quantities. Generally, justified considerations on the correctness of the determined parameters of the Arrhenius equation may undoubtedly include another element connected with it-the isokinetic temperature T iso or compensation temperature T c , to which many works have been devoted, among others [4,21,[41][42][43][44][45][46][47].…”

Section: Isokinetic Temperaturementioning

confidence: 99%

“…On the other hand, from a physicochemical point of view, a very interesting example is presented in [46] concerning temperature programmed desorption (TPD), when the surface coverage decreases with increasing temperature. Analyzing this phenomenon as a reversible process, while the isosteric heat of adsorption-once the entropy is determinedleads to EEC [6], the constant surface coverage condition is not respected-as is the case in isothermal sorption kinetic measurements-we observe a rather large scatter in terms of KCE [47].…”

Section: Summary Of Equations For Experimental Datamentioning

confidence: 99%

See 1 more Smart Citation

Isokinetic and Compensation Temperature in the Analysis of Thermal Dissociation of the Solid Phase under Dynamic Conditions

Mianowski,

Radko,

Bigda

2023

Energies

View full text Add to dashboard Cite

Sets of Arrhenius parameters, determined according to known different equations for dynamic conditions, in the vast majority form the Kinetic Compensation Effect (KCE). Converting these data to the simplified components of the Eyring equation comes down to Enthalpy–Entropy Compensation (EEC), which is consistent with the second law of thermodynamics. It has been proved that the impact of the generally known Coats−Redfern solution on the equation in differential form results in an isokinetic form of the equations and a very important coordinate T0;α0 (initial temperature and conversion degree), depending on the heating rate. This makes it possible to determine the parameters of Arrhenius’ law for both in silico and experimental data. An analytical method for determining this coordinate has been proposed. These considerations have given rise to an analysis of the relationship between two temperatures: initial and isokinetic. The sense of isokinetic temperature has been verified by the parameters CQF and K. Going further, it was found that the effects of EEC can be transformed into KCE and vice versa, which means that the two temperatures should be identical, i.e., Tiso=Tc. However, the experimental data indicate that the analyzed temperatures form a sequence T0↔Tiso↔Tc≤Teq, where Teq is the equilibrium temperature.

show abstract

Section: Isokinetic Temperaturementioning

confidence: 99%

Section: Summary Of Equations For Experimental Datamentioning

confidence: 99%

Isokinetic and Compensation Temperature in the Analysis of Thermal Dissociation of the Solid Phase under Dynamic Conditions

Mianowski,

Radko,

Bigda

2023

Energies

View full text Add to dashboard Cite

show abstract

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

Mianowski

Urbańczyk

2017

Adsorption

View full text Add to dashboard Cite

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.

show abstract

Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt

Shen

Yang

et al. 2023

J Coat Technol Res

View full text Add to dashboard Cite

The isokinetic effect as related to the activation energy for the gases diffusion in coal at ambient temperatures

Cited by 7 publications

References 27 publications

Isokinetic and Compensation Temperature in the Analysis of Thermal Dissociation of the Solid Phase under Dynamic Conditions

Isokinetic and Compensation Temperature in the Analysis of Thermal Dissociation of the Solid Phase under Dynamic Conditions

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

Effect of polytetrafluoroethylene (PTFE) emulsion impregnation coating on filtration performance and thermal property of polyphenylene sulfide (PPS) needle felt

Contact Info

Product

Resources

About