Tracer studies of acid-base catalyzed reactions. 13. The isomerization of the n-butenes over zinc oxide and alumina
Kinetic and deuterium tracer studies on the isomerization of 1-butene, cis-2-butene, and trans-2-butene on zinc oxide showed that the reactions were zero order in butene at 0/sup 0/-50/sup 0/C; that the reaction changed to first order kinetics and a Langmuir-Hinshelwood mechanism in the nonlinear region of the adsorption isotherm at higher temperatures; and that direct cis- to trans-butene conversion occurred without a 1-butene intermediate. The results were consistent with the mechanism developed by Kokes and coworkers, which involves the syn- and anti-m-allyls as intermediates. Tracer studies also revealed that intermolecular exchange, involving surface hydroxyls, was more important on alumina than on zinc oxide, but that isomerization probably proceeds by the same mechanism as on zinc oxide. Graphs, tables, and 23 references.
- Research Organization:
- Univ. of Wisconsin, Madison
- OSTI ID:
- 5862450
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 53:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION ISOTHERMS
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BUTENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
DEUTERIUM
HYDROCARBONS
HYDROGEN ISOTOPES
ISOMERIZATION
ISOTHERM
ISOTOPES
LABELLED COMPOUNDS
LIGHT NUCLEI
LOW TEMPERATURE
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
STABLE ISOTOPES
ZINC COMPOUNDS
ZINC OXIDES