| Autor: |
Charles Kemball, I.R. Shannon, H. F. Leach |
| Rok vydání: |
1973 |
| Předmět: |
|
| Zdroj: |
Journal of Catalysis. 29:99-104 |
| ISSN: |
0021-9517 |
| DOI: |
10.1016/0021-9517(73)90207-8 |
| Popis: |
The isomerization of but-1-ene was observed to occur readily over SnO2 at temperatures ca. 300 K. A feature was the formation of large amounts of butadiene as well as cis- and trans-but-2-ene. The major role played in the reaction by the catalyst was emphasized by the extensive loss of deuterium from but-1-ene-d8 to the catalyst surface. It was postulated that the reaction mechanism was largely dependent upon the existence of a butadiene surface species—formed by the simultaneous loss of two hydrogen atoms from adjacent carbon atoms on the adsorbed but-1-ene molecule. Different characteristics were exhibited by the cis-but-2-ene isomerization. Exclusive cis-trans isomerization was observed with no detectable double-bond migration (to give but-1-ene) or butadiene formation. An intramolecular mechanism involving as an intermediate a secondary butyl carbonium ion was invoked to rationalize the data. Coisomerization of cis-but-2-ene-d0 and cis-but-2-ene-d8 indicated that the exchange process was stepwise in nature and did not involve loss of deuterium to the catalyst surface. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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