Selective Skeletal Butene Isomerization Through a Bimolecular Mechanism

Abstract : n-Butene transformation was carried out at 350°C over medium pore size zeolites (H-FER, H-TON, H-EU-1 and H-MFI) and at 500°C over alumina. With fresh catalysts, not only isobutene but also propene and pentenes are primary products, which indicates that at least some of the butene isomerization occurs through oligomerization-isomerization-cracking steps (bimolecular mechanism). The large differences in selectivity are due to many factors, including whether or not trimer intermediates participate in the mechanism and limited product desorption. All the catalysts exhibit increasing isobutene selectivity with increasing time on-stream. This increase in selectivity can be explained by the selective isomerization of n-butene through a reaction process whose first step is the formation of trimethylpentene intermediates from isobutene product and n-butene reactant. This autocatalytic reaction can render the bimolecular transformation of n-butenes very selective to isobutene.
Document type :
Journal articles
Complete list of metadatas

Cited literature [31 references]  Display  Hide  Download

https://hal-ifp.archives-ouvertes.fr/hal-02075778
Contributor : Edp Sciences <>
Submitted on : Thursday, March 21, 2019 - 4:05:44 PM
Last modification on : Saturday, March 23, 2019 - 1:01:49 AM
Long-term archiving on : Saturday, June 22, 2019 - 3:21:51 PM

File

guisnet_v54n1.pdf
Publication funded by an institution

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

E. Benazzi, C. Travers, N. S. Gnep, P. Andy, M. Guisnet. Selective Skeletal Butene Isomerization Through a Bimolecular Mechanism. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 1999, 54 (1), pp.23-28. ⟨10.2516/ogst:1999002⟩. ⟨hal-02075778⟩

Share

Metrics

Record views

14

Files downloads

22