The synthesis of amines from biomass-based feedstock is in high demand given the depletion of fossil fuels. Reductive amination is one of the most straightforward synthetic methods to obtain a variety of amines; however, it is prone to denaturation and side reactions under the harsh conditions required. By fine-tuning the surface acidity of niobic acid (Nb 2 O 5 •nH 2 O), we evaluated the relationship between catalytic activity on reductive amination with the amount of acid sites on Nb 2 O 5 •nH 2 O. Ru/Nb 2 O 5 •nH 2 O reduced at 300 °C was found to be an efficient catalyst for the reductive amination of biomass-derived carbonyl compounds under low temperature to afford primary amines, without the formation of secondary amines or hydrogenated products.
Metal nanoparticles supported cellulose nanofiber composites (Au/CNF, Ni/CNF and Ag/CNF) were found to be highly efficient nanocatalysts for the rapid and selective reduction of nitrophenols in water.
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