Universidad Nacional Autónoma de México - CNyN

1st International Symposium on Nanoscience and Nanomaterials
3 Universidad Nacional Autónoma de México, Centro de Nanociencia y Nanotecnología, km.107 carr. Tijuana
- Ensenada, Ensenada, B.C., México.
4 Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil.
a mestrada@cicese.edu.mx, b eunicev@uabc.edu.mx, c elena@cnyn.unam.mx, e, f elena@ufmg.br,
g fuentes@cnyn.unam.mx, h andrey@cnyn.unam.mx.
Keywords: gold nanoparticles, primary alcohols, aerobic oxidation.
Metal catalyzed oxidations of alcohols which involve O 2 as a final oxidant, currently attract much
attention due to the low cost of oxygen as a “green oxidant”. Gold nanoparticles (NPs) being among the most
promising catalysts for these reactions. Au(3 wt.%)/MgO catalyst used for activity test has been prepared by
the deposition-precipitation technique. Fresh and spent samples were characterized by UV-Vis in situ and
TEM. It was revealed that Au/MgO is an effective catalyst for the liquid-phase oxidation of a wide range of
alcohols (1-phenylpropanol, Nerol, perillyl alcohol, isoborneol, carveol, menthol, isopulegol, and citronellol)
using O 2 as sole oxidant in the absence of any co-catalyst or additive. The authors thank to E. Flores, P.
Casillas, V. García, F. Ruiz, E. Aparicio, M. Sainz, J. Palomares and J. Peralta for their kind technical support
in this work. This project was supported by DGAPA–PAPIIT (UNAM, Mexico) through grant 224510.
P-006
GOLD SPECIES WITH DIFFERENT SIZE STABILIZED ON NANOSTRUCTURED ALUMINA
M. López 1a , E. Smolentseva 2b , M. A. Estrada 3c , E. Vargas 4d , B. Acosta 3e , A. Simakov 2f .
1 Posgrado en Ciencias e Ingeniería de Materiales UNAM Km. 107 Carr. Tijuana Ensenada 22860 Ensenada,
B.C., México
2 Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, km.107 Carr.
Tijuana –Ensenada 22860, Ensenada, B.C., México.
3 Posgrado en Física de Materiales, Centro de Investigación Científica y de Educación Superior de Ensenada,
Carr. Tijuana-Ensenada No. 3918 Fraccionamiento Zona Playitas, C.P. 22860 Ensenada, B.C., México.
4 Posgrado en Ciencias e Ingeniería, Área Nanotecnología, Universidad Autónoma de Baja California km.103
Carr. Tijuana –Ensenada 22860, Ensenada, B.C., México.
a
Martinlopez_360 @hotmail.com, b elena@cnyn.unam.mx, c mestrda@cnyn.unam.mx,
d evargas@cnyn.unam.mx, e bacosta@cnyn.unam.mx. f andrey@cnyn.unam.mx
Keywords: nanoparticles, gold, in-situ, nanostructured alumina.
Catalytic properties of supported gold species in the practically important reactions of environmental
and fine chemistry are determined by the size of these species. The present work was dedicated to the study of
dynamic formation of gold nanoparticles with different size over nanostructured alumina prepared by sol gel
technique using organo-metallic precursors. The appearance and sintering of gold species was monitored by
Mass-UV-Vis-In Situ technique consisting in the combination of high temperature fiber optic UV-Vis
spectrometer and simultaneous in line analysis of gas phase products with mass-spectrometer. The shape and
size of obtained gold species in the ready samples were characterized with TEM. Analysis of the steps of gold
nanoparticles formation resulted in the fabrication of Au/Al 2 O 3 samples with definite size and morphology of
the gold species. The authors thank E. Flores, F. Ruiz, J.A. Peralta, J. Palomares and O. Callejas for their
technical assistance. This research project was financially supported by DGAPA–PAPIIT through Grant IN
224510.
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