Preparing Au/ZnO by precipitation–deposition technique

• Published in: Applied catalysis. A, General Vol. 340; no. 1; pp. 133 - 139
• Main Authors: Souza, Kátia R., de Lima, Adriana F.F., de Sousa, Fernanda F., Appel, Lucia Gorenstin
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15-05-2008; Elsevier
• Subjects: Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; Gold; Ionic exchange; Precipitation–deposition; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Zinc; Gold; Precipitation–deposition; Zinc; Ionic exchange; Heterogeneous catalysis; Binary compound; Precipitation; Transition element compounds; Transition metal; Deposition; Precipitation-deposition
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2008.02.006

This report presents results related to the preparation of Au/ZnO using the deposition–precipitation technique. Many samples were synthesized taking into account different pH values, gold concentration, procedures and contact times between the gold precursor and support. The exposure of gold compounds to radiation in the visible range was also examined during the preparation. These syntheses show that precipitation–deposition is, in this case, an ionic exchange. It could be observed that exposure to light and competition among anions change the gold content of the catalyst. Therefore, these are important parameters in the preparation of gold catalyst by ionic exchange. The results also show that by using this technique it is possible to prepare active catalysts for the preferential oxidation of carbon monoxide (PROX) reaction.
This report presents results related to the Au/ZnO preparation by precipitation–deposition, which is in this case an ionic exchange. As exposure to light and competition among anions change the gold content they are important parameters in Au/ZnO synthesis. These results show that using this technique it is possible to prepare active catalysts for preferential oxidation of carbon monoxide (PROX) reaction.
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