Gold-Nano Particles Supported on Na-Y and H-Y Types Zeolites: Activity and Thermal Stability for CO Oxidation Reaction

• Published in: Catalysis letters 2009-03, Vol.128 (1-2), p.57-63
• Main Authors: Jafari, S, Asilian Mahabady, H, Kazemian, H
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts; Catalytic activity; Chemical synthesis; Chemistry; Chemistry and Materials Science; Chloroauric acid; Conversion; Exact sciences and technology; General and physical chemistry; Gold; Industrial Chemistry/Chemical Engineering; Ion-exchange; Organometallic Chemistry; Oxidation; Physical Chemistry; Pretreatment; Stability tests; Substrates; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Thermal stability; Zeolites; Zeolites: preparations and properties
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-008-9724-x

Gold nano particles (GNP) were deposited on Na-Y and H-Y zeolite substrates using chloroauric acid (HAuCl₄) solution. The synthesized catalysts were then characterized and the catalytic activity toward CO oxidation reaction was investigated using a tubular fix bed micro reactor under atmospheric pressure. It was found that CO conversion of 100% and 5% can be achieved at 20 °C on Au/Na-Y and Au/H-Y fresh catalysts, respectively. Thermal stability of catalysts was also investigated by treating the catalysts at 400 °C for 4 h. After thermal stability test, activity tests of the catalysts at 20 °C were shown that CO conversion of Au/Na-Y catalyst was decreased to 65% whereas the activity of the Au/H-Y at 20 °C was increased up to 15%. Characterization tests were revealed that the structures of the zeolitic supports were remained unchanged after thermal pretreatment.