Adsorption equilibria and kinetics of propane and propylene on zeolite 13X pellets

Jae Jeong Kim, Seung Jun Lim, Hyungwoong Ahn, Chang Ha Lee

Research output: Contribution to journalArticle

Abstract

The adsorption equilibria and kinetics of propane and propylene on zeolite 13X pellets were investigated by a piezometric sorption method at 283–363 K and vacuum to 650 kPa for propane and 750 kPa for propylene. The difference of the adsorption capacity between the two gases was not so great, the saturation capacity being measured at 2.95 mol/kg for propane and 3.34 mol/kg for propylene. However, it was observed clearly that propylene was more strongly adsorbed on 13X than propane upon looking into the isotherms and comparing the isosteric heats of adsorption. Dual-site Langmuir model could fit the experimental adsorption isotherm data well. Subsequently, its temperature-dependent parameters were extracted, enabling to make use of the isotherm model in designing a non-isothermal adsorption separation process. To extract the apparent reciprocal diffusion time constants, two different kinetic models were applied to the experimental uptake curves: a piezometric model suitable for the first uptake measured at the very low pressure close to zero and a non-isothermal sorption model for uptakes in the range of 10–40 kPa. The resultant apparent reciprocal diffusion time constants exhibited a strong dependency on the pressure, corresponding to the effective intercrystalline reciprocal diffusion time constants theoretically estimated by Knudsen diffusivity and the secant of isotherm. This confirmed the presumption that diffusions of propane and propylene into the 13X pellet were controlled by the intercrystalline diffusion.

LanguageEnglish
Pages286-298
Number of pages13
JournalMicroporous and Mesoporous Materials
Volume274
DOIs
Publication statusPublished - 2019 Jan 15

Fingerprint

Zeolites
Propane
propylene
pellets
propane
Propylene
isotherms
Adsorption
Kinetics
adsorption
time constant
kinetics
Isotherms
sorption
Sorption
diffusivity
Adsorption isotherms
low pressure
saturation
Gases

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Kim, Jae Jeong ; Lim, Seung Jun ; Ahn, Hyungwoong ; Lee, Chang Ha. / Adsorption equilibria and kinetics of propane and propylene on zeolite 13X pellets. In: Microporous and Mesoporous Materials. 2019 ; Vol. 274. pp. 286-298.
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Adsorption equilibria and kinetics of propane and propylene on zeolite 13X pellets. / Kim, Jae Jeong; Lim, Seung Jun; Ahn, Hyungwoong; Lee, Chang Ha.

In: Microporous and Mesoporous Materials, Vol. 274, 15.01.2019, p. 286-298.

Research output: Contribution to journalArticle

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