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Cracking And Aromatization Of Butanes Over ZSM-5 Zeolites

Published online by Cambridge University Press:  15 February 2011

Yoshio Ono ,
Kunihiko Kanae ,
Kazuaki Osako  and
Katsumi Nakashiro
Yoshio Ono
Affiliation:
Tokyo Institute of Technology, Dept. of Chemical Engineering, Ookayama, Neguro-ku, Tokyo 152, Japan
Kunihiko Kanae
Affiliation:
Tokyo Institute of Technology, Dept. of Chemical Engineering, Ookayama, Neguro-ku, Tokyo 152, Japan
Kazuaki Osako
Affiliation:
Tokyo Institute of Technology, Dept. of Chemical Engineering, Ookayama, Neguro-ku, Tokyo 152, Japan
Katsumi Nakashiro
Affiliation:
Tokyo Institute of Technology, Dept. of Chemical Engineering, Ookayama, Neguro-ku, Tokyo 152, Japan
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Abstract

The transformation of butanes over H-ZSM-5, Zn-ZSM-5, and Ga-ZSM-5 at 773 K were studied with special emphasis on the activation mechanism of butanes. Over H-ZSM-5, butanes undergo cracking exclusively by a carbonium-ion mechanism at low conversion levels. At higher conversion levels, the activation by a hydride-transfer mechanism are involved. The loading of Zn and Ga greatly enhances the dehydrogenation of starting alkanes as well as intermediate alkenes. The loading of the metal cations promotes also the cracking, especially in the case of isobutane. The synergetic action of the metal cations and protons is proposed as a mechanism of alkane dehydrogenation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 233: Symposium U – Synthesis/Characterization and Novel Applications of Molecular Sieve Materials , 1991 , 3
Copyright
Copyright © Materials Research Society 1991

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References

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