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Consiglio Nazionale Delle Ricerche

De Schrijver, Aster

Mario Pagliaro

David Avnir

Jochanan Blum

Rosaria Ciriminna

Giulio Deganello

Nanohybrid sol-gel materials, based on silica organically modified (ormosil) and doped with the ruthenium species tetra-n-propylammonium perruthenate (TPAP) are highly efficient catalysts for the selective oxidation of alcohols to carbonyls with oxygen at low pressure, in organic solvents as well as in carbon dioxide in supercritical state. Novel, highly active and stable materials are the fluorinated ormosils. Optimal conditions for the preparation and use thereof in liquid-phase as well as in supercritical COwere set by studying the structure-activity relationships of the materials, with particular reference to the surface hydrophobic/hydrophilic properties and to the textural ones.

Aerobic catalysts for alcohol oxidation in organic solvents and in supercritical carbon dioxide, process for the production thereof, and their use in oxidative conversions

A versatile methodology to obtain efficient catalytic materials suitable for selective, liquid-phase oxidations of alcohols is described. Solid inorganic membranes were prepared by the sol-gel procedure by adding a solution of stable organic nitroxyl radicals at the onset of the polymerization of silicon alkoxide monomers. In this way, micro- and mesoporous materials can be obtained that axe effective and recyclable catalytic mediators for highly selective oxidations of a vast class of primary and secondary alcohols carried out with several primary oxidants. Delicate substrates such as carbohydrates and allylic alcohols can selectively be oxidized with these novel catalytic materials.

Catalytic materials for selective oxidation of alcohols, process for production thereof and their use in alcohol oxidation process

Growing community of inventors

Palermo, Italy

Mario Pagliaro