Hydrogenation of arenes, alkenes and alkynes catalyzed by a sol-gel entrapped mixture of [Rh(cod)Cl]2 and Na[HRu3(CO)11]

Raed Abu-Reziq*, Margarita Shenglof, Liza Penn, Tomer Cohen, Jochanan Blum

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


A sol-gel entrapped 1:3 mixture of [Rh(cod)Cl]2 and Na[HRu3(CO)11] catalyzes the hydrogenation of various unsaturated substrates by two distinguishable mechanisms. Under 13.8 bar H2 and 20 °C methylated arenes react rapidly to give cycloalkane derivatives. XRD and TEM studies showed that under these conditions the hydrogenation proceeds without the generation of free metal particles. The hydrogenation of non-methylated arenes, as well as that of alkenes and alkynes, require a temperature of 80-120 °C at which the entrapped complexes form metallic nano-particles of 3-5 nm. Chloroarenes are also hydrodechlorinated at 120 °C, but require a hydrogen pressure of ≥25 bar. At both temperature ranges the catalysts are reusable at least four times. The high efficiency of the hydrogenation process at 20 °C is rationalized by a synergistic effect between the two different metal atoms of the combined catalyst. This may be related to a remote control model through a hydrogen spillover mechanism.

Original languageAmerican English
Pages (from-to)30-34
Number of pages5
JournalJournal of Molecular Catalysis A: Chemical
Issue number1-2
StatePublished - 1 Jul 2008
Externally publishedYes

Bibliographical note

Funding Information:
We thank Dr. Inna Popov and Dr. Vladimir Uvarov from the Unit for Nanoscopic Characterization (The HUJI Center for Nanoscience and Nanotechnology) for the performance of the XRD and TEM-EDS measurements, as well as the Israel Science Foundation (ISF) for the financial support of this study through Grant No. 296/06.


  • Heterogeneous hydrogenation
  • Rhodium
  • Ruthenium
  • Sol-gel
  • Synergism


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