Peculiarities observed in H-D exchange between perdeuterioisobutane and H-zeolites
- Univ. of Pittsburgh, PA (United States)
H-D exchange between perdeuterioisobutane and NaH-Y-zeolites and H-mordenite (H-M) was studied using the pulse technique. Nine of the ten D atoms in the isobutane molecule were exchanged for H on the most acidic Y-zeolites at the lowest temperature (200{degrees}C) where H-D exchange was observed, while other transformations of isobutane were not. The reaction is thought to be initiated by protonation of the tertiary C-D bond on the Bronsted acid sites of the catalyst and the exchange to proceed via the t-butyl carbenium ion intermediate. Release of the ion from the surface occurs via hydride transfer conserving the identity of the tertary position. At higher temperatures and over the more acidic H-mordenite at even lower temperature (125{degrees}C) an extensive intermolecular H-D exchange occurs between perdeuterioisobutane and its exchanged products. A more detailed understanding of this reaction chemistry is developed herein. 16 refs., 9 figs., 4 tabs.
- DOE Contract Number:
- FG02-87ER13774
- OSTI ID:
- 75788
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 151; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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