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Pure and binary adsorption isotherms of ethylene and ethane on zeolite 5A


Pure and binary adsorption equilibrium data of ethylene and ethane on zeolite 5A were collected with a volumetric method for the temperature range 283 K to 323 K and pressure up to 950 kPa. The applicability of the binary adsorption prediction by the vacancy solution theory (VST) was investigated. Further individual adsorption and selectivity were obtained by VST prediction. According to the experimental results, zeolite 5A has a high adsorption capacity and selectivity for ethylene in the ethylene/ethane system. VST predicts that ethylene selectivity increases with pressure; it also shows that the amount of ethylene separated by zeolite 5A increases as the temperature decreases at a specified pressure.

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Absolute average deviation

\(\overline{\alpha _{i}}\) :

Partial molar surface area of i (m2/mol)

b i :

Henry’s Law Constant of i (mol kg−1 kPa−1)

P :

Pressure of pure gas in equilibrium with its adsorbed phase (kPa)

p :

Total pressure of mixture in equilibrium with its adsorbed Phase (kPa)

\(q_{m}^{s}\) :

Total number of moles of mixture in surface phase (mol/kg)

\(q_{i}^{s,\infty}\) :

Maximum number of moles of i in surface phase (mol/kg)

\(q_{m}^{s,\infty}\) :

Maximum total number of moles of mixture in surface phase (mol/kg)

ΔH :

Isosteric heat of adsorption (kJ/mol)

R :

Universal gas constant (J mol−1 K−1)

S :


T :

Temperature of adsorption system (K)

X i :

Mole fraction of i in vacancy-free adsorbed phase

\(\mathrm{X}_{i}^{s}\) :

Mole fraction of i in adsorbed phase vacancy

Y i :

Mole fraction of i in vacancy-free vapor phase

\(\gamma_{i}^{s}\) :

Activity coefficient of i in adsorbed phase vacancy solution

θ :

Surface coverage

Λ ij ,Λ ji :

Aadsorbated–adsorbated interaction parameters from Wilson Eq. (7)

Λ iv ,Λ vi :

Adsorbate–vacancy interaction parameters

π :

Spreading pressure (J/m2)





i,j,K :


m :


N :

Number of components


Number of point

s :

Surface phase

v :



Value at maximum adsorption limit


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The authors are thankful to Persian Gulf University research office for financial support, providing various facilities and necessary approval under contract no. 19-561.

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Correspondence to Masoud Mofarahi.

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Mofarahi, M., Salehi, S.M. Pure and binary adsorption isotherms of ethylene and ethane on zeolite 5A. Adsorption 19, 101–110 (2013).

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  • Adsorption
  • Zeolite 5A
  • Ethylene/ethane separation system
  • Vacancy solution theory