1. Catalytic performance of bulk and colloidal Co/Al layered double hydroxide with Au nanoparticles in aerobic olefin oxidation
- Author
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Cristina I. Fernandes, Pedro D. Vaz, Sónia R. Leandro, Ana S. Viana, Ana Mourato, and Carla D. Nunes
- Subjects
inorganic chemicals ,Olefin fiber ,Aerobic oxidation catalysis ,Ion exchange ,010405 organic chemistry ,Chemistry ,Process Chemistry and Technology ,Epoxide ,Substrate (chemistry) ,Nanoparticle ,010402 general chemistry ,complex mixtures ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Styrene ,chemistry.chemical_compound ,Chemical engineering ,Hydroxide ,Gold nanoparticles ,Amino acids ,Clays - Abstract
A Co/Al layered double hydroxide material was synthesized in both bulk and exfoliated (colloidal) forms. Anion exchange with methionine allowed immobilization of Au nanoparticles previously prepared by a biomimetic method using an anti-oxidant tea aqueous extract to reduce the Au salt solution. The catalytic performance of bulk and exfoliated clays Au-hybrid materials was assessed in aerobic olefin epoxidation. Both catalysts were very active towards the epoxide products and with very interesting substrate conversion levels after 80 h reaction time. The Au-exfoliated material, where the nanosheets work as large ligands, yielded higher product stereoselectivity in the case of limonene epoxidation. This arises from a confined environment around the Au nanoparticles wrapped by the clay nanosheets modulating access to the catalytic active centres by reagents. Mechanistic assessment was also accomplished for styrene oxidation by DFT methods. more...
- Published
- 2019