Cover Picture: Synthesis of Platinum–Ruthenium Nanoparticles under Supercritical CO2 and their Confinement in Carbon Nanotubes: Hydrogenation Applications (ChemCatChem 1/2012) (page 1)
Dr. Eva Castillejos, Dr. Mohamad Jahjah, Dr. Isabelle Favier, Dr. Arantxa Orejón, Christian Pradel, Dr. Emmanuelle Teuma, Dr. Anna M. Masdeu-Bultó, Prof. Philippe Serp and Prof. Montserrat Gómez
Article first published online: 27 DEC 2011 | DOI: 10.1002/cctc.201190054
Selective Oxidation In their contribution on page 118 ff., Gómez, Serp, and co-workers describe efficient catalysts for the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol, the chemical responsible for the hyacinth's scent. Bimetallic platinum/ruthenium nanoparticles stabilized by simple ligands were prepared in both THF and supercritical carbon dioxide, giving more dispersed particles than those prepared in the organic solvent. Their confinement in multi-walled carbon nanotubes could be achieved thanks to the appropriate functionalization of the support by amide groups containing a long alkyl chain. The higher selectivity observed for the confined catalysts in relation to the non-confined ones, can be attributed to the higher concentration of reactants inside the multi-walled carbon nanotubes.