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n-Pentane Conversion on Sulfated Zirconia in the Absence and Presence of Carbon Monoxide: Evidence for Monomolecular Mechanism of Isomerization from the 13C MAS NMR Study Full article

Journal Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694
Output data Year: 2001, Volume: 203, Number: 2, Pages: 273-280 Pages count : 8 DOI: 10.1006/jcat.2001.3318
Tags Carbonylation, Isomerization, Mechanism, n-pentane, NMR spectroscopy, Sulfated zirconia
Authors Luzgin Mikhail V. 1 , Stepanov Alexander G. 1 , Shmachkova Vera P. 1 , Kotsarenko Nina S. 1
Affiliations
1 Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia

Funding (1)

1 Russian Foundation for Basic Research 99-03-32454

Abstract: In situ 13C MAS NMR analysis of hydrocarbon products formed from the selectively 13C-labeled n-pentane on sulfated zirconia in the absence and presence of carbon monoxide provide the evidence that iso-pentane forms by two parallel processes: isomerization and conjunct polymerization. Peculiarities of the 13C label scrambling from n-pentane into iso-pentane provide unequivocal evidence for monomolecular mechanism of the alkane isomerization. Besides iso-pentane, conjunct polymerization affords also the products of n-pentane “disproportionation,” butanes and hexanes and stable cyclopentenyl cations; the latter are in charge of the catalyst deactivation. Carbon monoxide suppresses completely the process of conjunct polymerization, whereas the process of intramolecular isomerization does not. In the presence of carbon monoxide carbonylation of n-pentane occurs in parallel with its isomerization, giving rise to a mixture of aldehydes, ketones, and carboxylic acids. Carbonylation of n-pentane with CO contributes to the earlier observed negative effect of CO on the alkane isomerization rate.
Cite: Luzgin M.V. , Stepanov A.G. , Shmachkova V.P. , Kotsarenko N.S.
n-Pentane Conversion on Sulfated Zirconia in the Absence and Presence of Carbon Monoxide: Evidence for Monomolecular Mechanism of Isomerization from the 13C MAS NMR Study
Journal of Catalysis. 2001. V.203. N2. P.273-280. DOI: 10.1006/jcat.2001.3318 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
Submitted: Nov 13, 2000
Accepted: Jun 14, 2001
Published print: Oct 25, 2001
Published online: May 25, 2002
Identifiers:
Web of science: WOS:000171973400003
Scopus: 2-s2.0-0035950581
Elibrary: 13378192
Chemical Abstracts: 2001:819142
Chemical Abstracts (print): 136:150840
OpenAlex: W50063926
Citing:
DB Citing
Web of science 28
Scopus 30
Elibrary 30
OpenAlex 29
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