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Diffusion of cyclohexane and alkylcyclohexanes in silicalite

Title
Diffusion of cyclohexane and alkylcyclohexanes in silicalite
Type
Article in International Scientific Journal
Year
1998
Authors
Laurence, RL
(Author)
Other
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Conner, WC
(Author)
Other
The person does not belong to the institution. The person does not belong to the institution. The person does not belong to the institution. Without AUTHENTICUS Without ORCID
Journal
Vol. 102
Pages: 2317-2324
ISSN: 1089-5647
Indexing
Publicação em ISI Web of Science ISI Web of Science
COMPENDEX
Scientific classification
FOS: Natural sciences > Chemical sciences
Other information
Authenticus ID: P-008-NTD
Abstract (EN): The diffusion of cyclohexane and several alkylcyclohexanes in silicalite was studied using a simultaneous thermal analyzer. This apparatus allowed for the determination of heats of sorption and diffusion coefficients. Zero length chromatography was also used to determine diffusivities of some of the adsorbates. The trend in diffusion rates observed was trans-1,4-dimethylcyclohexane >> methylcyclohexane > cyclohexane > ethylcyclohexane, cis-1,4-dimethylcyclohexane. This is in qualitative agreement with the previous results of Chon and Park. A comprehensive interpretation of the experimental results was developed, using the basic qualitative arguments of transition state theory. The fast diffusion of trans-1,4-dimethylcyclohexane is associated with a relatively low energy barrier for channel crossing. The transition entropy for diffusion appears to be the reason for the more rapid diffusion of methylcyclohexane relative to cyclohexane.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 8
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