Loading...
3 results
Search Results
Now showing 1 - 3 of 3
- Gold nanoparticles deposited on surface modified carbon materials as reusable catalysts for hydrocarboxylation of cyclohexanePublication . Ribeiro, A. P. C.; Martins, Luisa; Carabineiro, S. A. C.; Figueiredo, J. L.Gold nanoparticles were deposited on different carbon materials and used as catalysts for the alkane hydrocarboxylation reaction. Cyclohexane hydrocarboxylation to cyclohexanecarboxylic acid was carried out in the presence of CO and water, peroxodisulfate, in water/acetonitrile medium, at ca. 50 degrees C, with gold nanoparticles deposited by a colloidal method on carbon nanotubes and activated carbon with three different surface chemistries: in their original forms (CNT or AC, respectively), oxidized with HNO3 (ox) or oxidized with HNO3 and subsequently treated with NaOH (-ox-Na). Au/CNT-ox-Na was the best catalyst, yielding cyclohexanecarboxylic acid up to 88.2% yield, with excellent recyclability (97.5% of the initial activity was maintained after five consecutive catalytic cycles).
- Highly efficient and reusable CNT supported iron(II) catalyst for microwave assisted alcohol oxidationPublication . Martins, Luisa; Ribeiro, A. P. C.; Carabineiro, S. A. C.; Figueiredo, J. L.; Pombeiro, ArmandoThe highly efficient eco-friendly synthesis of ketones (yields over 99%) from secondary alcohols is achieved by combination of [FeCl2{eta(3)-HC(pz)(3)}] (pz = pyrazol-1-yl) supported on functionalized multi-walled carbon nanotubes and microwave irradiation, in a solvent-free medium. The carbon homoscorpionate iron(II) complex is the first one of this class to be used as catalyst for the oxidation of alcohols.
- Carbon dioxide-to-methanol single-pot conversion using a C-scorpionate iron(II) catalystPublication . Ribeiro, A. P. C.; Martins, Luisa; Pombeiro, ArmandoThe highly efficient eco-friendly synthesis of methanol (44% yield, TONs up to 2.3 x 10(3)) directly from carbon dioxide is achieved by using H-2 and the iron(II) scorpionate catalyst [FeCl2{kappa(3)- HC(pz)(3)}] (pz = pyrazol-1-yl) in a solvent- or amine-free mild new protocol.