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Pressure-dependent product distribution of citral hydrogenation over micelle-hosted Pd and Ru nanoparticles in supercritical carbon dioxide

Meric, P., Yu, K.M.K., Kong, A.T.S. and Tsang, S.C. (2006) Pressure-dependent product distribution of citral hydrogenation over micelle-hosted Pd and Ru nanoparticles in supercritical carbon dioxide. Journal of Catalysis, 237 (2). pp. 330-336. ISSN 0021-9517

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To link to this item DOI: 10.1016/j.jcat.2005.11.010

Abstract/Summary

In situ synthesis and testing of Ru and Pd nanoparticles as catalysts in the presence of ammonium perfluorohydrocarbo-carboxylate surfactant in supercritical carbon dioxide were carried out in a stainless steel batch reactor at 40 degrees C over a pressure range of 80-150 bar CO2/H-2. Direct Visualization of the formation of a supercritical phase at above 80 bar, followed by the formation of homogeneous microemulsions containing dispersed Ru nanoparticles and Pd nanoparticles in scCO(2) at above 95-100 bar, were conducted through a sapphire window reactor using a W-0 (molar water to surfactant ratio) of 30. The synthesised RU and Pd nanoparticles showed interesting product distributions in the selective hydrogenation of organic molecules, depending critically oil the density and polarity of the fluid (which ill turn depends on the pressure applied). Thus, selective hydrogenation of the citral molecule, which contains three reducible groups (aldehydes and double bonds at the 23 and 6,7 positions), is feasible Lis a chemical probe. (c) 2005 Elsevier Inc. All rights reserved.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:11474
Uncontrolled Keywords:citral hydrogenation, micelle-hosted Ru nanoparticle, supercritical, carbon dioxide, citronellal selectivity, LIQUID-PHASE OXIDATION, SUPPORTED PLATINUM CATALYSTS, ALPHA,BETA-UNSATURATED ALDEHYDES, SELECTIVE HYDROGENATION, CINNAMALDEHYDE HYDROGENATION, METAL-CATALYSTS, PARTICLE-SIZE, PALLADIUM, FLUIDS, AIR

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