Synthesis of highly dispersed gold nanoparticles on Al2O3, SiO2, and TiO2 for the solvent-free oxidation of benzyl alcohol under low metal loadings

Author(s):Show less -

Gualteros, Jesus A. D. ^[1] ; Garcia, Marco A. S. ^[1] ; da Silva, Anderson G. M. ^[2] ; Rodrigues, Thenner S. ^[3] ; Candido, Eduardo G. ^[3] ; e Silva, Felipe A. ^[3] ; Fonseca, Fabio C. ^[3] ; Quiroz, Jhon ^[2] ; de Oliveira, Daniela C. ^[4] ; Cordoba de Torresi, Susana I. ^[2] ; de Moura, Carla V. R. ^[1] ; Camargo, Pedro H. C. ^[2] ; de Moura, Edmilson M. ^[1]

Affiliation

^[1] Univ Fed Piaui, Dept Quim, BR-64049550 Teresina, PI - Brazil

^[2] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo, SP - Brazil

^[3] CNEN, IPEN, BR-05508000 Sao Paulo, SP - Brazil

^[4] Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Luz Sincrotron, Campinas, SP - Brazil

• Document type: Journal article
• Source: Journal of Materials Science; v. 54, n. 1, p. 238-251, JAN 2019.
• Web of Science Citations: 8

Abstract

We reported the organic template-free synthesis of gold (Au) nanoparticles (NPs) supported on TiO2, SiO2, and Al2O3 displaying uniform Au sizes and high dispersions over the supports. The Au-based catalysts were prepared by a deposition-precipitation method using urea as the precipitating agent. In the next step, the solvent-free oxidation of benzyl alcohol was investigated as model reaction using only 0.08-0.05mol% of Au loadings and oxygen (O-2) as the oxidant. Very high catalytic performances (TOF up to 443,624h(-1)) could be achieved. Specifically, we investigated their catalytic activities, selectivity, and stabilities as well as the role of metal-support interactions over the performances. The conversion of the substrate was found to be associated with the nature of the employed support as the Au NPs presented similar sizes in all materials. A sub-stoichiometric amount of base was sufficient for the catalyst activation and the observation of the catalysts profile over the time enable insights on their recyclability performances. We believe this reported method represents a facile approach for the synthesis of uniform Au-supported catalysts displaying high performances. (AU)

• FAPESP's process: 17/12407-9 - Hybrid nanostructures of transition metal oxides and conducting polymers for various applications
• Grantee: Anderson Gabriel Marques da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/21366-9 - HYBRID MATERIALS CONTAINING METAL NANOPARTICLES FOR CATALYTIC APPLICATIONS
• Grantee: Pedro Henrique Cury Camargo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Grantee: Julio Romano Meneghini
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 14/09087-4 - Studies on the use of bioethanol in proton exchange membrane and solid oxide fuel cells
• Grantee: Marcelo Linardi
• Support Opportunities: Research Projects - Thematic Grants