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  Selective sorption uptake kinetics of n-hexane on ZSM 5 - a new method for measuring anisotropic diffusivities

Caro, J., Noak, M., Richter Mendau, J., Marlow, F., Petersohn, D., Griepentrog, M., et al. (1993). Selective sorption uptake kinetics of n-hexane on ZSM 5 - a new method for measuring anisotropic diffusivities. The Journal of Physical Chemistry, 97(51), 13685-13690. doi:10.1021/j100153a043.

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 Creators:
Caro, J.1, Author
Noak, M.1, Author
Richter Mendau, J.1, Author
Marlow, Frank2, 3, Author              
Petersohn, D.2, Author
Griepentrog, M.22, Author
Kornatowski, Jan4, 5, Author              
Affiliations:
1Zentrum fur Heterogene Katalyse, Rudower Chapssee 5. D- 12489 Berlin, Germany, ou_persistent22              
2Bundesanstalt für Materialforschung und-priifung, Unter den Eichen 87, D-12205 Berlin, Germany, ou_persistent22              
3Research Group Marlow, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445612              
4Institute of Chemistry, Nicholas Copernicus University, Gagarina 7,87- 100 Torun, Poland., ou_persistent22              
5Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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 Abstract: Selective sorption uptake kinetics is a new experimental approach to the determination of the components of the diffusion tensor of reactant or adsorbate molecules in microporous crystals with anisotropic channel system, By first orienting molecular sieve crystals vertically or horizontally and then embedding them in sputtered copper, one finds that an abrasion of the resultant composites opens selective pathways along the z axis or the x,y axes. The new method is demonstrated for the study of the diffusion anisotropy of n-hexane in ZSM-5. Analysis of the sorption uptake curve showed that the diffusion along the length of the crystals (z direction) is ca. 3 times slower than that occurring perpendicular to this direction. This finding corresponds with the mean net diffusion flux densities through crystal faces of different labels. However, the simplicity of the approach is complicated by crystal twinning effects.

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Language(s): eng - English
 Dates: 1993-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/j100153a043
 Degree: -

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Title: The Journal of Physical Chemistry
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: 51 Volume / Issue: 97 (51) Sequence Number: - Start / End Page: 13685 - 13690 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766_3