Reactions of n-Hexane over Pt-Zeolite Catalysts of Different Acidity

Z. Zhan, I. Manninger, Z. Paál, D. Barthomeuf

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Pt-HY, Pt-NaHY, Pt-NaY, and Pt-NaX catalysts, which possess decreasing acidity and increasing basicity in the above sequence, were tested at 603 K in n-hexane conversion as a model reaction. Pt-HY and Pt-NaHY, which are acidic, are more active by about an order of magnitude than the two non-acidic catalysts. Selectivities measured at different hydrocarbon and hydrogen pressures are presented as a function of the overall conversion. Pt-HY and Pt-NaHY produce mainly skeletal isomers, fragments and, at most, minor amounts of benzene. Fragment composition indicated that pronounced cracking occurs over Pt-HY only, together with minor hydrogenolysis on the metallic centers. This latter reaction is responsible for most fragments over the other three catalysts. Metal-catalyzed C5-cyclic isomerization, ring closure, and pronounced aromatization prevail over Pt-NaY and Pt-NaX. The latter behaves like a typical non-acidic metal catalyst. Pt-NaY exhibits an outstanding aromatization selectivity which can possibly be attributed to the interaction of basic centers of the framework with the Pt particles rather than to geometric reasons.

Original languageEnglish
Pages (from-to)333-341
Number of pages9
JournalJournal of Catalysis
Volume147
Issue number1
DOIs
Publication statusPublished - May 1994

Fingerprint

Zeolites
Hexane
Acidity
acidity
Aromatization
catalysts
Catalysts
Catalyst selectivity
fragments
selectivity
Metals
hydrogenolysis
Hydrogenolysis
Alkalinity
Isomerization
Hydrocarbons
Benzene
Isomers
metals
isomerization

ASJC Scopus subject areas

  • Process Chemistry and Technology
  • Catalysis

Cite this

Reactions of n-Hexane over Pt-Zeolite Catalysts of Different Acidity. / Zhan, Z.; Manninger, I.; Paál, Z.; Barthomeuf, D.

In: Journal of Catalysis, Vol. 147, No. 1, 05.1994, p. 333-341.

Research output: Contribution to journalArticle

Zhan, Z. ; Manninger, I. ; Paál, Z. ; Barthomeuf, D. / Reactions of n-Hexane over Pt-Zeolite Catalysts of Different Acidity. In: Journal of Catalysis. 1994 ; Vol. 147, No. 1. pp. 333-341.
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