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  Investigation of Diffusion and Counter-diffusion of Benzene and Ethylbenzene in ZSM-5-type Zeolites by a Novel IR Technique

Nießen, W., & Karge, H. G. (1991). Investigation of Diffusion and Counter-diffusion of Benzene and Ethylbenzene in ZSM-5-type Zeolites by a Novel IR Technique. Chemistry of Microporous Crystals, 213-221. doi:10.1016/S0167-2991(08)61901-1.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0009-F0DD-F Version Permalink: https://hdl.handle.net/21.11116/0000-000A-005E-D
Genre: Journal Article

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 Creators:
Nießen, Wilhelm1, Author           
Karge, Hellmut G.1, Author           
Affiliations:
1Fritz Haber Institute, Max Planck Society, ou_24021              

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 Abstract: A novel in-situ IR technique is applied to study diffusion and counter-diffusion of benzene and ethylbenzene in H-ZSM-5 zeolite. The transport of the adsorbate molecules from a diluted feed stream into the catalyst or vice versa is studied in a precatalytic regime but under conditions close to a catalytic run. Diffusivities are evaluated for the single component as well as for the binary case at various temperatures and loadings. The diffusion coefficient determined for benzene at 415 K and a coverage of about 0.11 mmol benzene per gram zeolite (0.6 molecules benzene per unit cell) amounts to D = 9.7x 10-10 cm2. s−1 and is in excellent agreement with literature data obtained by different uptake techniques or NMR measurements. The activation energies for diffusion of benzene and ethylbenzene are 20 kJ.mol−1 and 25 kJ.mol−1, respectively. Counter-diffusion, under similar conditions, reduces the diffusivities, which were observed in the single-component case, by about 50%.

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Language(s): eng - English
 Dates: 1991
 Publication Status: Issued
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/S0167-2991(08)61901-1
 Degree: -

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Title: Chemistry of Microporous Crystals
Source Genre: Book
 Creator(s):
Inui, Tomoyuki, Editor
Namba, Seitaro, Editor
Tatsumi, Takashi, Editor
Affiliations:
-
Publ. Info: Amsterdam : Elsevier
Pages: 9 Volume / Issue: - Sequence Number: - Start / End Page: 213 - 221 Identifier: ISBN: 978-0-444-98702-0

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Title: Studies in Surface Science and Catalysis
Source Genre: Series
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Publ. Info: -
Pages: - Volume / Issue: 60 Sequence Number: - Start / End Page: - Identifier: ISSN: 0167-2991