Catalytic isomerization of 2-pentene in H-ZSM-22 - A DFT investigation

Autor(en)

Th Demuth, Xavier Rozanska, Lubomir Benco, Juergen Hafner, Rutger A. van Santen, Hervé Toulhoat

Abstrakt

The skeletal isomerization of a 2-pentene molecule catalyzed by acidic ZSM-22 was investigated by ab initio DFT studies. Two different scenarios proposed in the literature were tested. First a reaction including an alkyl shift was considered: a methyl or ethyl group is detached from the carbenium ion chain and reattached at another site in the residual hydrocarbon chain. However, this mechanism is rather unlikely, since the alkyl ion is a high-energy species, so its detachment from the carbenium ion induces a high activation energy. We find that the more likely pathway for skeletal isomerization inside the channels of ZSM-22 involves the rearrangement of the carbenium ion into a protonated dimethylcyclopropane and implies the formation of relatively stable secondary carbenium ions as transient intermediates. © 2003 Elsevier Science (USA). All rights reserved.

Organisation(en)

Computergestützte Materialphysik

Externe Organisation(en)

Eindhoven University of Technology, Institut Francais du Petrole (IFP), Universität Wien

Journal

Journal of Catalysis

Band

214

Seiten

68-77

Anzahl der Seiten

10

ISSN

0021-9517

DOI

https://doi.org/10.1016/S0021-9517(02)00074-X

Publikationsdatum

2003

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6119d97d-23f4-40c2-8e80-537c15d1d488