The isomerization of 2-methyl-2-pentene on stoichiometric and nonstoichiometric boron phosphate

The isomerization of 2‐methyl‐2‐pentene has been studied on boron phosphate (BP) catalysts with P/B ratios from 0.8 to 1.6 and at various reaction temperatures and contact times. Double‐bond shift occurs on the compositions with P/B of 1.0 and less, while methyl shifts occur on samples with P/B of 1...

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Bibliographic Details
Published in:Catalysis letters 1999-01, Vol.61 (1-2), p.61-64
Main Authors: GAO, S, MOFFAT, J. B
Format: Article
Language:English
Subjects:
Ammonia
Bonding
Boron
Catalysis
Catalytic reactions
Chemisorption
Chemistry
Composition
Exact sciences and technology
General and physical chemistry
Isomerization
Lewis acid
NMR spectroscopy
Organic chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The isomerization of 2‐methyl‐2‐pentene has been studied on boron phosphate (BP) catalysts with P/B ratios from 0.8 to 1.6 and at various reaction temperatures and contact times. Double‐bond shift occurs on the compositions with P/B of 1.0 and less, while methyl shifts occur on samples with P/B of 1.2–1.6, demonstrating the presence of strong acidity on the latter solids. Ammonia chemisorption and proton MAS NMR is employed to provide supplementary evidence of the variation in acidity with composition. Although BP of P/B < 1 contains predominantly Lewis acid sites, 2‐methyl‐2‐pentene isomerizes through carbocations, which are formed on the strong Brønsted acid sites on BP with P/B > 1.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1019035830402