Isomerization of 1-Cyclohexyloctane on Pt/H-ZSM-22 Bifunctional Zeolite Catalyst

1-Cyclohexyloctane is isomerized in the vapor phase on Pt/H-ZSM-22 zeolite catalyst in the presence of hydrogen. Most of the reaction products are identified and analyzed using high-resolution GC and GC/MS. The reaction pathways of 1-cyclohexyloctane are interpreted in terms of alkylcarbenium/alkylc...

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Bibliographic Details
Published in:Journal of catalysis 1998-03, Vol.174 (2), p.201-209
Main Authors: Souverijns, W., Houvenaghel, A., Feijen, E.J.P., Martens, J.A., Jacobs, P.A.
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:1-Cyclohexyloctane is isomerized in the vapor phase on Pt/H-ZSM-22 zeolite catalyst in the presence of hydrogen. Most of the reaction products are identified and analyzed using high-resolution GC and GC/MS. The reaction pathways of 1-cyclohexyloctane are interpreted in terms of alkylcarbenium/alkylcarbonium ion chemistry. The main isomerization pathways are branching of the ring, elongation and shortening of alkyl substituents on the ring, and ring contractions and expansions. A less important pathway is chain branching, occurring selectively at C-atom positions distant from the ring. In the reaction product fraction of heptyl, methylcyclohexanes, preferential formation of the 1-heptyl-t-4-methylcyclohexane is observed. The formation of 1-heptyl, 1′-methylcyclohexane is completely suppressed. The peculiar selectivity patterns are explained by a mechanism in which the molecules react in micropore mouths at the external surface of the ZSM-22 zeolite crystals.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1998.1968