Saturation loadings on 13X (faujasite) zeolite above and below the critical conditions. Part III: Inorganic monatomic and diatomic species data evaluation and modeling

Abouelnasr, Dana; Loughlin, Kevin F.; Mousa, Alaa Al

doi:10.1007/s10450-017-9906-1

Cited by 3 publications

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“…This data represent 163 isotherms, ranging in temperature from 77 to 448 K. Of these, 146 are in the Henry’s law region. An earlier version of Figure was published in Figure S9b in Abouelnasr et al; it is updated to Figure to display these 64 studies. The data of Ertan, Kiselev, Li and Tezel, and Gorbunov et al contains only Henry constants and lacks isotherms.…”

Section: Resultsmentioning

confidence: 99%

“…The isotherms range from 90 K with a maximum saturation loading of over 25 g/100g Z at the bottom of the plot to 448 K with a maximum saturation loading of 5 g/100gZ at the top of the plot. An equation for q max is given in the paper of Abouelnasr et al and is This equation is represented as a red dashed line in Figure and subsequent virial plots. This curve was created by connecting points on isotherms where they attain or are close to the saturated value.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Critical Evaluation of Henry’s Law Constants for Nitrogen on the NaX (13X) Zeolite

Loughlin¹,

Abouelnasr

2021

Ind. Eng. Chem. Res.

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Henry’s constants are evaluated from 164 isotherms from 64 published studies with the goal of providing information for use in the design of PSA, TSA, and adsorption columns. The isotherms are inspected using the linear virial isotherm as a probe mechanism. Five different categories of isotherms may be identified by this technique. Henry’s law constants, K′ in g/100gZ/kPa and dimensionless K, are given by and where −ΔU 0 = 18.55 kJ/mol and −ΔH 0 = 20.53 kJ/mol. The values of −ΔH 0 are comparable to most literature values, but some idiosyncratic data are identified. Heats of adsorption and entropy changes are evaluated from the Henry constants. Consideration of the heats of adsorption indicates homogeneous adsorption in the α cage for much of the isotherm and for most forms of 13X zeolites studied. The isosteric heat of adsorption data in the literature revealed that adsorption of nitrogen on the 13X zeolite is primarily homogeneous in the large cavity at ≈19 kJ/mol. There are exceptions, such as inhomogeneous loading and adsorption in the β cage. Evaluation of entropy changes upon adsorption indicates that order increases from the vapor phase to the adsorbed phase in the α cage and even more so in the β cage. The entropy of adsorption between the gas phase and adsorbed phase indicated a decrease of 35 J/mol·K for adsorption in the large cavity and 59 J/mol·K on adsorption into the sodalite cage.

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