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

doi:10.1016/S1387-1811(99)00230-9

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

Inorganic Materials & Catalysis

Research output: Contribution to journal › Article › Academic › peer-review

24 Citations (Scopus)

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 language	English
Pages (from-to)	315-326
Number of pages	12
Journal	Microporous and Mesoporous Materials
Volume	35-36
DOIs	https://doi.org/10.1016/S1387-1811(99)00230-9
Publication status	Published - 2000

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@article{0fd68b7e5abf47d2bc361e7553ffec79,

title = "Tracer-exchange experiments with positron emission profiling: diffusion in zeolites",

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",

author = "R.R. Schumacher and B.G. Anderson and N.J. Noordhoek and {Gauw, de}, F.J.M.M. and {Jong, de}, A.M. and {Voigt, de}, M.J.A. and {Santen, van}, R.A.",

year = "2000",

doi = "10.1016/S1387-1811(99)00230-9",

language = "English",

volume = "35-36",

pages = "315--326",

journal = "Microporous and Mesoporous Materials",

issn = "1387-1811",

publisher = "Elsevier B.V.",

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T1 - Tracer-exchange experiments with positron emission profiling: diffusion in zeolites

AU - Schumacher, R.R.

AU - Anderson, B.G.

AU - Noordhoek, N.J.

AU - Gauw, de, F.J.M.M.

AU - Jong, de, A.M.

AU - Voigt, de, M.J.A.

AU - Santen, van, R.A.

PY - 2000

Y1 - 2000

N2 - 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

AB - 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

U2 - 10.1016/S1387-1811(99)00230-9

DO - 10.1016/S1387-1811(99)00230-9

M3 - Article

SN - 1387-1811

VL - 35-36

SP - 315

EP - 326

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

ER -

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

Abstract

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