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- W2043672446 abstract "To identify hydrocarbon surface species accumulating during alkane isomerization, a strategy involving in situ UV–vis and FTIR spectroscopies, reaction of formed species with various bases, adsorption of reference compounds, and extraction of spent catalysts was applied. During conversion of n-butane or n-pentane on H-mordenite at reaction temperatures below ≈550 K, species characterized by an intense absorption band at a wavelength of 292–296 nm were observed by in situ diffuse reflectance UV–vis spectroscopy. Species with a comparable electronic signature formed after adsorption of 1-butene, 1-pentene, or 1-hexene, indicating that olefins are intermediates in the formation of carbonaceous deposits from alkanes. The chromophore was largely invariant to the carbon chain length and the species were identified as alkyl-substituted cyclopentenyl cations. Carbonaceous deposits formed at temperatures higher than ≈550 K consisted of methyl-substituted naphthalenes, anthracenes, and tetracenes; these species also existed as stable cations on the zeolite during catalysis, producing a broad absorption at 350–500 nm. The polycyclic aromatic species were neutralized by water vapor, whereas the alkyl-substituted cyclopentenyl cations required a stronger base, such as ammonia." @default.
- W2043672446 created "2016-06-24" @default.
- W2043672446 creator A5012436233 @default.
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- W2043672446 date "2013-11-01" @default.
- W2043672446 modified "2023-10-18" @default.
- W2043672446 title "Identification of carbonaceous deposits formed on H-mordenite during alkane isomerization" @default.
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- W2043672446 doi "https://doi.org/10.1016/j.jcat.2013.07.011" @default.
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