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Título del libro: Nanotechnology 2010: Advanced Materials, Cnts, Particles, Films And Composites - Technical Proceedings Of The 2010 Nsti Nanotechnology Conference And Expo, Nsti-Nanotech 2010
Título del capítulo: Formation and stabilization of gold clusters and nanoparticles in mordenites

Autores UNAM:
NINA BOGDANCHIKOVA; MIGUEL AVALOS BORJA; MARIO HUMBERTO FARIAS SANCHEZ;

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Autores externos:

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Idioma:

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Año de publicación:
2010

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Palabras clave:

Acid media; Acid site; Atmospheric oxygen; Clusters; Gold catalysts; Gold clusters; Ion-exchange methods; Ionic state; Long-term storage; Metal cluster; Metallic particles; Molar ratio; Mordenites; Redox potentials; Redox process; Stationary state; UV visible spectroscopy; Acids; Catalyst deactivation; Catalyst poisoning; Electronic states; Films; Gold; Ion exchange; Nanoparticles; Nanotechnology; Oxidation; Oxygen; Redox reactions; Silicon compounds; Spectroscopic analysis; Stabilization; Storage (materials); Ultraviolet spectroscopy; Gold compounds

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Resumen:

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.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9781439834015
Editorial:

Tipo de producto:
Conference Paper