Alkane hydrocracking: Shape selectivity or kinetics?

Theo L.M. Maesen, Sofia Calero, Merijn Schenk, Berend Smit

Research output: Contribution to journalArticleAcademicpeer-review

37 Citations (Scopus)

Abstract

A critical evaluation of published alkane hydrocracking product distributions shows that the kinetic network shifts from predominantly ααγ-trimethylalkane to predominantly αα- and αγ-dimethylalkane hydrocracking when the acid sites are insufficiently covered with alkenes. Since ααγ- trimethylalkane hydrocracking has a higher symmetry than αα- and αγ-dimethylalkane hydrocracking, this alteration in the predominant hydrocracking pathway changes the product distribution from a histogram with a single sharp maximum irrespective of the alkane length to histograms with several maxima depending on the feed alkane length. Thermodynamic, kinetic, and mechanistic considerations are presented to explain both types of histograms in great detail. These largely kinetic explanations supplant earlier attempts at linking the features of the hydrocracking product distributions to features of the topologies of the various (zeolite-based) catalysts employed.

Original languageEnglish
Pages (from-to)241-251
Number of pages11
JournalJournal of Catalysis
Volume221
Issue number1
DOIs
Publication statusPublished - 1 Jan 2004
Externally publishedYes

Keywords

  • Alkane hydrocracking
  • Amorphous aluminosilicates
  • Kinetics
  • MOR-, FAU-, EMT-, BEA-type zeolites

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