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

Autor(es):Mostrar menos -

Francisco S. C. L. Batista ^[1] ; Itaciara E. M. S. Melo ^[2] ; Laíse N. S. Pereira ^[3] ; Alexia G. P. Lima ^[4] ; Ali H. Bashal ^[5] ; Jean C. S. Costa ^[6] ; Janildo L. Magalhães ^[7] ; Francisco C. A. Lima ; Carla V. R. Moura ^[9] ; Marco A. S. Garcia ^[10] ; Edmilson M. Moura ^[11]

Afiliação do(s) autor(es):Mostrar menos -

^[1] Universidade Federal do Piauí. Departamento de Química - Brasil

^[2] Universidade Federal do Piauí. Departamento de Química - Brasil

^[3] Universidade Federal do Piauí. Departamento de Química - Brasil

^[4] Universidade Federal do Piauí. Departamento de Química - Brasil

^[5] Taibah University. Faculty of Science. Department of Chemistry

^[6] Universidade Federal do Piauí. Departamento de Química - Brasil

^[7] Universidade Federal do Piauí. Departamento de Química - Brasil

^[9] Universidade Federal do Piauí. Departamento de Química - Brasil

^[10] Universidade Federal do Piauí. Departamento de Química - Brasil

^[11] Universidade Federal do Piauí. Departamento de Química - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 31, n. 3, p. 488-497, 2020-03-02.

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. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs