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

Autor(es):Mostrar menos -

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Science; v. 54, n. 1, p. 238-251, JAN 2019.
• Citações Web of Science: 6

Resumo

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)

• Processo FAPESP: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Beneficiário: Julio Romano Meneghini
• Linha de fomento: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 15/21366-9 - Materiais híbridos contendo nanopartículas metálicas para aplicações catalíticas
• Beneficiário: Pedro Henrique Cury Camargo
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/09087-4 - Estudos sobre o uso do bioetanol em células a combustível do tipo PEMFC e SOFC
• Beneficiário: Marcelo Linardi
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/12407-9 - Nanoestruturas híbridas de óxidos de metais de transição e polímeros condutores para aplicações diversas
• Beneficiário: Anderson Gabriel Marques da Silva
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado