Evaluation of the thermodynamic parameters for the adsorption of some hydrocarbon's on 4A and 13X zeolites by inverse gas chromatography

Inel O., Topaloglu D., Askin A., Tumsek F.

CHEMICAL ENGINEERING JOURNAL, vol.88, pp.255-262, 2002 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 88
  • Publication Date: 2002
  • Doi Number: 10.1016/s1385-8947(02)00026-8
  • Journal Name: CHEMICAL ENGINEERING JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.255-262
  • Keywords: inverse gas chromatography, heat of adsorption, adsorption thermodynamic parameters, molecular sieve 13X, molecular sieve 4A, SURFACES, ALKANES, COVERAGE, SILICAS
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

Inverse gas chromatography has been used to evaluate the adsorption parameters (DeltaH, DeltaS and DeltaG) of some probes, each representing a class of organics (n-hexane, cyclohexane and benzene) on 4A and 13X zeolites. The adsorption parameters of the probes on 4A were determined in the finite concentration region, and those on 13X were determined in the infinite dilution region. The interactions between the probes and the surface were discussed in the light of determined thermodynamic parameters of adsorption. It was found that the adsorption isotherms for 4A conform with the Langmuir equation and benzene exhibits more negative DeltaH than for n-hexane and cyclohexane on both 4A and 13X. Also, interactions of the benzene and n-hexane with 13X were found to be stronger than that on 4A. (C) 2002 Elsevier Science B.V. All rights reserved.