1,721,027 research outputs found
Preparation and characterization of nanosized Fe-based heterogeneous catalysts on mixed oxide supports
No full textINTERACTION OF MOLECULAR-OXYGEN WITH AMINOPHENOLS MEDIATED BY COPPER METAL AND COPPER-COMPOUNDS
No full textSeveral copper compounds (Cu, Cu2O, CuO, CuCl and CuCl2) have been used as catalysts for the oxidation of 2-, 3- and 4-aminophenol with O2 at 25-degrees-C; a comparison of their activities was made through kinetic determinations. The oxidation of 2-aminophenol selectively produced 2-amino-phenoxazin-3-one (1), whereas the oxidation products of 3- and 4-aminophenol were two new compounds, 2-amino-5 [(3-hydroxyphenyl)amino]-2,5-cyclohexadiene-1,4-dione (3) and 3-[(4-hydroxyphenyl)amino]-4-[(2-amino-5-hydroxy)phenyl]-6-[(4-hydroxyphenyl)imino]-2, 4-cyclohexadien-1-one (2)
Activation of small molecules by copper. Part I: selective oxidation of organic substrates
No full textThe use of copper catalysts in the hydrogen transfer reduction of 4-tert-butylcyclohexanone
No full textSeveral low loading supported catalysts were tested in the hydrogen transfer reduction of 4-tert-butyl-cyclohexanone showing good activity under very mild conditions (2-propanol as solvent, 83 C, N2). Results obtained by using different alcohols as donors suggest that a two step dehydrogenation-hydrogenation mechanism is operating over Cu/SiO2
Preparation and characterization of nanosized Fe2O3 catalytic phases on SiO2-ZrO2 supports
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Characterization of the surface acidity of oxide catalysts in liquids of different polarity
No full textSolvent-free, low temperature selective hydrogenation of rapeseed oil and sunflower oil methylesters using nanoparticle Pd catalysts
No full textHeterogeneous selective catalytic hydrogenation of aryl ketones to alcohols without additives
No full textA selective hydrogenation of different aryl ketones can be obtained by using a heterogeneous copper catalyst under very mild experimental conditions, namely 90 C and 1 atm of hydrogen, without using any kind of additive or poisoning agent. © 2005 Elsevier Ltd. All rights reserved
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