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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Costa, Jean C. S. ; Goncalves, Renato V. ; Teixeira-Neto, Erico ; Rossi, Liane M.
Total Authors: 4
Document type: Journal article
Source: CHEMISTRYSELECT; v. 2, n. 2, p. 660-664, JAN 2017.
Web of Science Citations: 3
Abstract

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)

FAPESP's process: 13/11298-0 - Morphology and morphogenesis of bimetallic heterogeneous catalysts with planned architectures
Grantee:Érico Teixeira Neto
Support Opportunities: Regular Research Grants
FAPESP's process: 14/15159-8 - Metal nanoparticles: challenges on the preparation, stabilization and activation for catalysis
Grantee:Liane Marcia Rossi
Support Opportunities: Regular Research Grants
FAPESP's process: 12/09342-9 - Development of porous bimetallic nanomaterials based gold with well defined geometries and spectroscopic study of catalytic reactions of selective oxidation of alcohols
Grantee:Jean Claudio Santos Costa
Support Opportunities: Scholarships in Brazil - Post-Doctoral