Activity and selectivity of bifunctional platinum catalysts in hydrocarbon reactions

Erhard G. Christoffel, Zoltan Paál

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Conversions of a number of C6C8-alkanes, naphthenes, and aromatics on bifunctional platinum/carrier catalysts, on Pt-black, and on the acidic carriers of the bifunctional catalysts are investigated in the temperature range 300-500 °C and at hydrogen partial pressures of 0-45 bars in a continuously operated fixed-bed reactor and in microcatalytic pulse reactors. Three activity and selectivity levels of the platinum in bifunctional Pt/acidic carrier catalysts may be broadly recognized: (1) temperatures below 350 °C where mainly platinum-catalyzed reactions contribute to the measured product distributions, (2) a temperature region around 400 °C where platinum drastically changes its activity and selectivity in hydrogenolysis and isomerization reactions due to removable carbonaceous deposits and (3) a region above about 400 °C where due to irreversible carbiding platinum only displays (de)hydrogenation activity. The product distributions from conversions of the model compounds on irreversibly carbided Pt/carrier catalysts are mainly governed by acid-catalyzed interconversions through nonclassical carbonium ion intermediates.

Original languageEnglish
Pages (from-to)30-44
Number of pages15
JournalJournal of Catalysis
Volume73
Issue number1
DOIs
Publication statusPublished - Jan 1982

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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