Formation and stabilization of gold clusters and nanoparticles in mordenites

A. Pestryakov, N. Bogdanchikova, I. Tuzovskaya, M. Avalos, M. H. Farías

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Changes in electronic state of gold supported on mordenites during long-term storage in air have been studied by UV-visible spectroscopy method. Supporting gold on mordenites by ion-exchange method with further reduction with H2 led to formation of neutral and charged metal clusters and nanoparticles. Prolonged storage of the gold catalysts in air caused intensive redox processes. Ionic states of gold were partly reduced, perhaps, under the action of light, whereas metallic particles, in contrast, were oxidized by atmospheric oxygen. After one-year storage both as-prepared and reduced samples came to more or less similar stationary state. Cluster contribution and their stability depend strongly on acidity of zeolite (determined by SiO 2/Al2O3 molar ratio). Strong Brønsted acid sites favor the stabilization of gold clusters and their oxidation during prolonged storage in air because of higher redox potential of oxygen in acid media. Oxidation of gold clusters and nanoparticles can be considered as the main cause of gold catalyst deactivation during prolonged storage.

Original languageEnglish
Title of host publicationNanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010
Pages494-497
Number of pages4
Volume1
Publication statusPublished - 2010
EventNanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010 - Anaheim, CA, United States
Duration: 21 Jun 201024 Jun 2010

Other

OtherNanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010
CountryUnited States
CityAnaheim, CA
Period21.6.1024.6.10

Keywords

  • Clusters
  • Gold
  • Long-term storage
  • Nanoparticles
  • Oxidation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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  • Cite this

    Pestryakov, A., Bogdanchikova, N., Tuzovskaya, I., Avalos, M., & Farías, M. H. (2010). Formation and stabilization of gold clusters and nanoparticles in mordenites. In Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010 (Vol. 1, pp. 494-497)