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Two types of niobium-containing silica catalysts, (i) in-framework mixed oxide, obtained by co-precipitation type synthesis, and (ii) grafted niobium sites on silica supports, obtained via post-synthesis deposition from niobocene dichloride, were prepared. Both solids were tested in a series of five repeated batch-wise liquid-phase epoxidation tests of limonene with 50% aqueous hydrogen peroxide.Nb/SiO...
The incorporation of oxygen to organic substrates has been matter of great interest in chemistry. With the growing concern for the environment, this reaction has also been subject of investigation to bring out more environmentally friendly systems. The use of hydrogen peroxide or nitrous oxide as oxidants can become an alternative to more pollutant compounds and, even though these generate by-products,...
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