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The Nature, Structure, and Composition of Adsorbed Hydrocarbon Products of Ambient Temperature Oligomerization of Ethylene on Acidic Zeolite H-ZSM-5 Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694
Output data Year: 1998, Volume: 178, Number: 2, Pages: 466-477 Pages count : 12 DOI: 10.1006/jcat.1998.2172
Authors Stepanov Alexander G. 1 , Luzgin Mikhail V. 1 , Romannikov Vyacheslav N. 1 , Sidelnikov Vladimir N. 1 , Paukshtis Eugenii A. 1
Affiliations
1 Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia

Abstract: The nature, structure, and composition of hydrocarbon products that form under oligomerization of ethylene on acidic zeolite H-ZSM-5 at room temperature (296 K) have been analyzed using a combination ofin situIR and13C NMR andex situ13C NMR and GC-MS. It is shown that oligomers strongly retained by the zeolite framework represent a mixture of hydrocarbons which composition ranges from C5to ca C14+carbon atoms. Adsorbed oligomers are bound to the oxygens of the zeolite framework to form alkoxy species. Alkoxy species represent main adsorption state of the oligomers, but they are in equilibrium with olefins and carbenium ions of the same composition, the concentration of both carbenium ions and olefins seems to be beyond the sensitivity of both NMR and IR. The reactivity of the adsorbed oligomers is defined by the reactivity of equilibrated carbenium ions which can easily interact with carbon monoxide and water to give a mixture of corresponding carboxylic acids. Oligomeric alkoxides with linear hydrocarbon fragments prevail in the mixture of the formed oligomers. The average length of the linear oligomer chain includes approximately seven carbon atoms. Prevalence of the linear hydrocarbon fragments over branched ones in adsorbed oligomers seems to be defined by both specific framework and dimensions of the channels of the zeolite H-ZSM-5.
Cite: Stepanov A.G. , Luzgin M.V. , Romannikov V.N. , Sidelnikov V.N. , Paukshtis E.A.
The Nature, Structure, and Composition of Adsorbed Hydrocarbon Products of Ambient Temperature Oligomerization of Ethylene on Acidic Zeolite H-ZSM-5
Journal of Catalysis. 1998. V.178. N2. P.466-477. DOI: 10.1006/jcat.1998.2172 publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Dates:
Submitted: Oct 16, 1997
Accepted: Jun 1, 1998
Published print: Sep 10, 1998
Published online: May 25, 2002
Identifiers:
publication_identifier.wos_identifier_type WOS:000075891800008
publication_identifier.scopus_identifier_type 2-s2.0-0001582763
publication_identifier.rinz_identifier_type 13304203
publication_identifier.accession_number_identifier_type 1998:634218
publication_identifier.chemical_accession_number_identifier_type 129:275535
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