Initial changes of the catalytic properties of platinum containing catalysts. I. Transformations of mono- and bimetallic Pt/Al2O3 catalysts by carbonaceous deposits

G. Lietz, J. Völter, M. Dobrovolszky, Z. Paál

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The initial stages of catalytic activity of mono-metallic Pt/Al2O3 as well as bimetallic Pt-Sn, Pt-Re and Pt-Pb supported on A12O3 have been studied in n-heptane (and also, n-hexane) conversion. Initially all catalysts exhibited strong cracking activity. This could be suppressed by accumulating carbonaceous deposits. Gradually benzene and toluene formation became predominant. This tendency was more pronounced with higher hydrocarbon pressure; even less hydrocarbon ensured a more rapid change with Pt-Sn and Pt-Pb. Pt-Re occupied an intermediate position. A model was developed to explain the activity shifts: accordingly, small concentrations of C1 species produced during hydrogenolysis, could migrate to the support; in higher concentrations, however, they could act as inert additives like Sn. In still higher concentrations they would polymerize and cause catalyst deactivation. This model was supported by radiotracer studies.

Original languageEnglish
Pages (from-to)77-87
Number of pages11
JournalApplied Catalysis
Volume13
Issue number1
DOIs
Publication statusPublished - 1984

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Hydrocarbons
Platinum
Deposits
Hydrogenolysis
Catalyst deactivation
Catalysts
Toluene
Heptane
Benzene
Hexane
Catalyst activity
Pressure
n-hexane
n-heptane

ASJC Scopus subject areas

  • Engineering(all)
  • Medicine(all)

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Initial changes of the catalytic properties of platinum containing catalysts. I. Transformations of mono- and bimetallic Pt/Al2O3 catalysts by carbonaceous deposits. / Lietz, G.; Völter, J.; Dobrovolszky, M.; Paál, Z.

In: Applied Catalysis, Vol. 13, No. 1, 1984, p. 77-87.

Research output: Contribution to journalArticle

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