Recent developments in the surface and catalytic chemistry of supported organoactinides

Moris S. Eisen, Tobin J. Marks*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


The adsorption of organoactinide complexes on dehydroxylated alumina (DA) yields coordinatively unsaturated, highly active catalysts for several demanding chemical transformations. Thus, in the case of Th(η3-allyl)4 supported on dehydroxylated γ-alumina (DA), facile arene hydrogenation and alkane activation processes can be effected in slurry reactions at 90°C and PH2 = 30-180 psi. Benzene reduction occurs at a turnover frequency of ≈ 25000 h-1 per active site and cyclohexane CH exchange with D2 at ≈ 1300 h-1 per active site. Active site characterization using D2O poisoning, hydrogenolysis, and CH3Cl dosing indicates ≤ 8 ± 1 % of the Th surface sites are catalytically significant. EPR and XPS spectroscopy provide no evidence for Th oxidation states less than +4. The mechanisms for the above processes are discussed in terms of electrophilic "four-center" activation processes in which the active sites appear to bear sterically significant, nonhydridic ancillary ligation.

Original languageEnglish
Pages (from-to)23-50
Number of pages28
JournalJournal of Molecular Catalysis
Issue number1-3
StatePublished - 3 Jan 1994
Externally publishedYes


  • alkane activation
  • allyl complexes
  • arenes
  • heterogeneous catalysis
  • hydrogenation
  • thorium


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