Tracer-exchange experiments with positron emission profiling: diffusion in zeolites

R.R. Schumacher, B.G. Anderson, N.J. Noordhoek, F.J.M.M. Gauw, de, A.M. Jong, de, M.J.A. Voigt, de, R.A. Santen, van

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Abstract

A new technique for tracer-exchange experiments with positron emission profiling, was developed which permits the spatially resolved, in situ investigation of kinetic processes in fixed- bed reactors under steady-state conditions. Modeling of the complete reactor proves to be a valuable tool for the design and interpretation of experiments. To validate the new method, the micropore diffusion of 2-methylpentane and n-hexane in silicalite has been investigated. For n-hexane, a diffusivity of 7+/-1 x 10(-8) cm(2) s(-1) was measured at a temperature of 413 K with an activation energy of 19+/-3 kJ mol(-1). The diffusivity of 2-methylpentane at the same temperature was 1.0 +/- 0.2 x 10-8 cm(2) s(-1) with an activation energy of 29 +/- 3 kJ mol(-1), clearly showing the influence of the additional steric hindrance due to branching. (C) 2000 Elsevier Science B.V. All rights reserved
Original languageEnglish
Pages (from-to)315-326
Number of pages12
JournalMicroporous and Mesoporous Materials
Volume35-36
DOIs
Publication statusPublished - 2000

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