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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.)

Easy Access to Metallic Copper Nanoparticles with High Activity and Stability for CO Oxidation

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Author(s):
Goncalves, Renato V. [1] ; Wojcieszak, Robert [2, 3] ; Wender, Heberton [4] ; Dias, Carlos Sato B. [5] ; Vono, Lucas L. R. [1] ; Eberhardt, Dario [6] ; Teixeira, Sergio R. [7] ; Rossi, Liane M. [1]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil
[2] Univ Lille Nord France, F-59000 Lille - France
[3] UMR CNRS 8181, UCCS, F-59655 Villeneuve Dascq - France
[4] Univ Fed Mato Grosso do Sul, Inst Fis, BR-79070900 Campo Grande, MS - Brazil
[5] LNLS, BR-13083970 Sao Paulo - Brazil
[6] Univ Caxias Sul, BR-95700000 Bento Goncalves, RS - Brazil
[7] Univ Fed Rio Grande do Sul, Inst Fis, BR-90046900 Porto Alegre, RS - Brazil
Total Affiliations: 7
Document type: Journal article
Source: ACS APPLIED MATERIALS & INTERFACES; v. 7, n. 15, p. 7987-7994, APR 22 2015.
Web of Science Citations: 26
Abstract

Copper catalysts are very promising, affordable alternatives for noble metals in CO oxidation; however, the nature of the active species remains unclear and differs throughout previous reports. Here, we report the preparation of 8 nm copper nanoparticles (Cu NPs), with high metallic content, directly deposited onto the surface of silica nanopowders by magnetron sputtering deposition. The as-prepared Cu/SiO2 contains 85% Cu-0 and 15% Cu2+ and was enriched in the Cu phase by H-2 soft pretreatment (96% Cu-0 and 4% Cu2+) or further oxidized after treatment with O-2 (33% Cu-0 and 67% Cu2+). These catalysts were studied in the catalytic oxidation of CO under dry and humid conditions. Higher activity was observed for the sample previously reduced with H-2, suggesting that the presence of Cu-metal species enhances CO oxidation performance. Inversely, a poorer performance was observed for the sample previously oxidized with O-2. The presence of water vapor caused only a small increase in the temperature require for the reaction to reach 100% conversion. Under dry conditions, the Cu NP catalyst was able to maintain full conversion for up to 45 h at 350 degrees C, but it deactivated with time on stream in the presence of water vapor. (AU)

FAPESP's process: 14/15159-8 - Metal nanoparticles: challenges on the preparation, stabilization and activation for catalysis
Grantee:Liane Marcia Rossi
Support type: Regular Research Grants
FAPESP's process: 11/17402-9 - Development of multifunctional magnetic nanoparticles for cancer therapy
Grantee:Heberton Wender Luiz dos Santos
Support type: Regular Research Grants
FAPESP's process: 13/21323-2 - Development of advanced nickel and copper nanocatalysts highly efficient in syngas production by the reverse water gas shift reaction (RWGS)
Grantee:Renato Vitalino Gonçalves
Support type: Scholarships in Brazil - Post-Doctorate