An FR study of the n- and i-butane diffusion in theta-1, ferrierite and silicalite-1

G. Onyestyák, J. Valyon, L. V.C. Rees

Research output: Contribution to journalConference article

9 Citations (Scopus)

Abstract

In the one-, two-, and three-dimensional (1D, 2D, and 3D) micropore system of theta-1, ferrierite, and silicalite-1, respectively, diffusion to the sorption sites was found to control the rate of propane and butane sorption at 373 K and 133 Pa pressure. The diffusivity of propane (C3) and n-butane (n-C4) was about the same and much faster than that of the i-butane (i-C4). In theta-1 and ferrierite, the i-C4 transport was too slow to be characterized by the frequency-response (FR) method. Ten-ring apertures determine the critical pore dimension of each material. In ferrierite, however, the transport diffusivity of the n-alkanes was about 10-15 m2 s-1, several orders of magnitude smaller than that in theta-1 and silicalite-1. Results suggest that normal alkane diffusion proceeds in the 3D pore system of silicalite-1 and single-file diffusion prevails in the micropores of ferrierite and theta-1.

Original languageEnglish
Pages (from-to)93-97
Number of pages5
JournalSolid State Ionics
Volume141-142
DOIs
Publication statusPublished - May 1 2001
Event14th Intenational Symposium on the Reactivity of Solids - Budapest, Hungary
Duration: Aug 27 2000Aug 31 2000

Keywords

  • Diffusion of alkane
  • Frequency-response technique
  • Medium-pore molecular sieves

ASJC Scopus subject areas

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

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