Micelle-hosted palladium nanoparticles catalyze citral molecule hydrogenation in supercritical carbon dioxide

Langmuir : the ACS Journal of Surfaces and Colloids
Pascal MericShik Chi Tsang

Abstract

A new approach of employing metal particles in micelles for the hydrogenation of organic molecules in the presence of fluorinated surfactant and water in supercritical carbon dioxide has very recently been introduced. This is allegedly to deliver many advantages for carrying out catalysis including the use of supercritical carbon dioxide (scCO2) as a greener solvent. Following this preliminary account, the present work aims to provide direct visual evidence on the formation of metal microemulsions and to investigate whether metal located in the soft micellar assemblies could affect reaction selectivity. Synthesis of Pd nanoparticles in perfluorohydrocarboxylate anionic micelles in scCO2 is therefore carried out in a stainless steel batch reactor at 40 degrees C and in a 150 bar CO2/H2 mixture. Homogeneous dispersion of the microemulsion containing Pd nanoparticles in scCO2 is observed through a sapphire window reactor at W0 ratios (molar water-to-surfactant ratios) ranging from 2 to 30. It is also evidenced that the use of micelle assemblies as new metal catalyst nanocarriers could indeed exert a great influence on product selectivity. The hydrogenation of a citral molecule that contains three reducible groups (aldehyde, double...Continue Reading

References

Feb 19, 2002·Chemical Reviews·Alfons Baiker
Apr 25, 2002·Journal of the American Chemical Society·Hiroyuki OhdeMariko Ohde
Jul 18, 2002·Chemical Communications : Chem Comm·Unnikrishnan R Pillai, Endalkachew Sahle-Demessie
Mar 24, 1999·Journal of the American Chemical Society·Min JiJohn L Fulton

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Citations

Jul 9, 2014·Soft Matter·Jianling ZhangBuxing Han

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