Propylene/propane mixture adsorption on faujasite sorbents

Arjen Van Miltenburg*, Jorge Gascon, Weidong Zhu, Freek Kapteijn, Jacob A. Moulijn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

The adsorption of propylene and propane on zeolite NaX with and without a saturated (36 wt%) amount of CuCl have been investigated. The single component adsorption isotherms could be well described with a Dual-Site Langmuir model. The dispersion of CuCl results in a decrease of the maximum adsorption capacity of the zeolite for both components. For propylene a strong adsorption via π-complexation with CuCl is present, increasing the adsorption selectivity of the zeolite. The binary mixture (50:50) adsorption was determined via breakthrough/desorption experiments at 318, 358 and 408 K with a partial pressure of the two components between 0.8-54 kPa. For NaX the mixture loading could be well described with the IAS-theory and the single component isotherms, both qualitatively and quantitatively. A transition from an enthalpy controlled adsorption at lower loadings to an entropy affected adsorption at higher loadings was observed. The IAS-theory could only qualitatively describe the trends in the observed mixture adsorption for the CuCl/NaX adsorbent. The dispersion of CuCl in NaX results in a modest improvement of the adsorption selectivity for propylene over propane (from 3-7 to 15-30) but at the expense of a reduced capacity.

Original languageEnglish (US)
Pages (from-to)309-321
Number of pages13
JournalAdsorption
Volume14
Issue number2-3
DOIs
StatePublished - Jun 1 2008

Keywords

  • Binary adsorption
  • Breakthrough
  • Faujasite
  • Propane
  • Propylene
  • Selectivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Surfaces and Interfaces

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