Temperature-Driven Restructuring of Silver on AuAg Porous Nanotubes: Impact on CO Oxidation

Autor(es)

Costa, Jean C. S. ; Goncalves, Renato V. ; Teixeira-Neto, Erico ; Rossi, Liane M.

• Tipo de documento: Artigo Científico
• Fonte: CHEMISTRYSELECT; v. 2, n. 2, p. 660-664, JAN 2017.
• Citações Web of Science: 3

Resumo

Gold porous nanotubes (PNTs) prepared by the galvanic replacement reaction between HAuCl4 and a sacrificial metal nanowire have received attention as a platform for developing self-sustained catalysts. However, due to an alloying process, the PNT contains a complex mixture of the two metals. Their thermal behavior, e.g., atom restructuring and morphological changes, under reaction conditions has been scarcely studied and difficult to predict. Here, we demonstrate that restructuring of silver atoms occurs after the thermal treatment of AuAg PNTs obtained through galvanic replacement reaction. Using various characterization techniques such as X-ray diffraction, analytical electron microscopy, and X-ray photoelectron spectroscopy, we were able to elucidate the structure and surface composition of this novel nanoarchitecture, which approaches an Ag nanoparticle-decorated AuAg PNT like structure. The surface changes were studied through the catalytic oxidation of CO, a model reaction for surface science investigations. (AU)

• Processo FAPESP: 13/11298-0 - Morfologia e morfogênese de catalisadores heterogêneos bimetálicos com arquiteturas planejadas
• Beneficiário: Érico Teixeira Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/15159-8 - Nanopartículas metálicas: desafios na preparação, estabilização e ativação para catálise
• Beneficiário: Liane Marcia Rossi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/09342-9 - Desenvolvimentos de nanomaterias bimetálicos porosos a base de ouro com geometrias bem definidas no estudo catalítico e espectroscópico de reações de oxidação seletiva de alcoóis
• Beneficiário: Jean Claudio Santos Costa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado