Screening of the Au:Pt Atomic Ratio Supported in SrCO3: Effects on the Performance of the Solvent-Free Oxidation of Benzyl Alcohol

AUTOR(ES)

Batista, Francisco S. C. L.; Melo, Itaciara E. M. S.; Pereira, Laíse N. S.; Lima, Alexia G. P.; Bashal, Ali H.; Costa, Jean C. S.; Magalhães, Janildo L.; Lima, Francisco C. A.; Moura, Carla V. R.; Garcia, Marco A. S.; Moura, Edmilson M.

FONTE

J. Braz. Chem. Soc.

DATA DE PUBLICAÇÃO

2020-03

RESUMO

We have prepared, by a sol-immobilization method, bimetallic catalysts with different Au:Pt atomic ratios supported on commercial SrCO3. The catalytic performance for the oxidation reaction of benzyl alcohol of such materials was compared to the monometallic counterparts, aiming at the obtaining of the best composition of the material. It was found that the Au:Pt atomic ratio presents a remarkable effect on the system performance, i.e., Pt-rich systems are more selective; however, less active. Thus, an equilibrium related to the activity and selectivity of the system was obtained by considering the yield of the system. Also, some density functional theory (DFT) insights were obtained by using a cluster of 14 atoms of Au and 1 or 2 atoms of Pt. X-ray photoelectron spectroscopy, elemental mapping in scanning transmission electron microscopy before and after catalyst usage, flame atomic absorption spectroscopy, Rietveld refinement, among other techniques, were used and associated to the experimental data, which allowed us to propose a catalytic mechanism for the system, which was important since SrCO3 has not been considered before as catalyst support for alcohol oxidation reactions.

Documentos Relacionados

• Microwave accelerated solvent-free synthesis of flavanones
• Microwave-assisted Passerini reactions under solvent-free conditions
• Accessing Basic Sites on Modified CoFe2O4 Nanoparticles: Addressing the Selective Oxidation of Benzyl Alcohol and Unraveling the Au:Pd Ratio Effects by XPS
• A solvent-free synthesis of beta-enamino trihalomethyl ketones
• Pyrazole synthesis under microwave irradiation and solvent-free conditions