SYNTHESIS NANO-Au SUPPORTED IN OXIDES METALLIC AND CATALYTIC ACTIVITY IN OXIDATION REACTION OF CO

Authors

  • Juan Carlos Dí­az Araujo Departamento de Biología y Química, NURR, Universidad de Los Andes
  • Bernardo Fontal Universidad de Los Andes
  • Diego Merchan Combita ITQ-UPV-CSIC
  • Cristina Martinez ITQ-UPV-CSIC
  • Avelino Corma ITQ-UPV-CSIC

Abstract

Gold nanoparticles, Nano-Au, were prepared on different supports and used as CO oxidation catalysts. Synthesis of Nano-Au, supported on TiO2, CeO2 and γ-Al2O3  was done by precipitation  in  non-aqueous  HAuCl4/ethylene-glycol in  a Li2S/oxide/ethylene-glycol suspension in a minimum HClO4 volume. All the nano-structured systems were characterized by TEM, XPS, XRD, AE, ICP and  UV- Visible methods. The TEM images confirm Nano-Au/ oxide formation on all the supports. Particle size distribution analysis suggest different dispersions, being Au/Al2O3 (~3,45 nm) the least dispersed system. XRD analysis shows the presence of Au/oxide, compared with the XRD standard, and crystal size was estimated using the Debye-Scherrer equation. UV-visible spectra shows a characteristic band near 520 nm, due to plasmon resonance in all the synthetized systems and there was no clear tendency between particle size and the absorption band displacement. XPS analysis shows two peaks with a slight displacement in bonding energy, assigned to the Au4f7/2 y Au4f5/2  transitions due to Au(0) and Au3+  from Au2S3. The CO oxidation  catalytic activity of Nano-Au was done in a static bed reactor at low temperature, obtaining a 36% conversion with Au/TiO2.

Downloads

Download data is not yet available.

Downloads

Published

2011-11-19

How to Cite

Dí­az Araujo, J. C., Fontal, B., Combita, D. M., Martinez, C., & Corma, A. (2011). SYNTHESIS NANO-Au SUPPORTED IN OXIDES METALLIC AND CATALYTIC ACTIVITY IN OXIDATION REACTION OF CO. LatinAmerican Journal of Metallurgy and Materials, 43–53. Retrieved from https://www.rlmm.org/ojs/index.php/rlmm/article/view/269

Issue

2013, 33(1)

Section

Regular Articles

License

The authors of papers accepted for publication by the RLMM, should recognize the complete transfer of copyright (in all languages) to the RLMM. This transfer includes the right by the RLMM to adapt the article for digital or printed reproduction without altering the written content and information displayed in tables or figures within. The authors retain the copyright and guarantee the journal the right to be the first publication of the work as well as licensed under a Creative Commons Attribution License 4.0 Internacional (CC BY 4.0) which allows others to share the work with an acknowledgment of the authorship of the work and the initial publication in this journal.