Hydrogenolysis of cyclohexane over Ir/SiO2 catalyst: A mechanistic study of carbon-carbon bond cleavage on metallic surfaces

F. Locatelli, J. P. Candy, B. Didillon, G. P. Niccolai, D. Uzio, Jean-Marie Maurice Basset*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The hydrogenolysis of cyclohexane catalyzed by supported Ir/SiO2 has been studied to get mechanistic information on the elementary steps of C-C bond cleavage for cyclic saturated hydrocarbons. The reaction was studied under conditions in which no dehydrogenation to benzene occurs. When a mixture of cyclohexane and H2 flows over a Ir/SiO2 catalyst at 200°C and for a H2/cyclohexane ratio superior to 40, methane, ethane, propane, n-butane, n-pentane, and n-hexane are identified to be primary products. The hydrogenolysis of ethane and n-hexane has also been studied to clarify several mechanistic questions. To account for the primary products in the above reactions, a mechanism is proposed in which the key step of the carbon-carbon bond cleavage occurs via concerted electronic transfer in dimetallacyclopentane intermediate. The comparison of product distributions in the hydrogenolysis of cyclohexane and that observed for n-hexane led to conclusions about the relative ease of carbon-carbon bond cleavage with respect to surface alkyl isomerization.

Original languageEnglish (US)
Pages (from-to)1658-1663
Number of pages6
JournalJournal of the American Chemical Society
Volume123
Issue number8
DOIs
StatePublished - Feb 28 2001

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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