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SYNTHESIS, ACTIVITY AND THERMAL STABILITY OF GOLD

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Author(s): H. Asilian Mahabady, S. Jafari, H. Kazemian, A. Khavanin

Journal: Iranian Journal of Environmental Health Science & Engineering
ISSN 1735-1979

Volume: 4;
Issue: 4;
Start page: 263;
Date: 2007;

Keywords: Gold nanoparticle | NH4Y-type zeolite | CO oxidation | Catalyst | Thermal stabilization

ABSTRACT
Gold nanoparticle is the active catalyst for CO oxidation at low temperature. This feature of gold basecatalysts is suitable to overcome the problem of cold-start problem of automobile exhaust TWCconverters. In this study gold nanoparticle were deposited on modified NH4-Y type zeolite. The activity ofsynthesized catalyst was measured in a fixed-bed quartz-tubular reactor (7mm i.d.) under atmosphericpressure. In order to investigate the catalytic activities toward CO oxidation reaction, 31mL/min of air and0.155mL/min of carbon monoxide were mixed and then passed through the reactor. It was found thatactivity of Au/Y catalyst was 100% at 20°C. The thermal stability of Au/Y catalyst was measured at400°C for 4h. The activity of the catalyst was decreased to 65% at 20°C after thermal stability test.Results of Energy Dispersive Analysis by X-rays before and after thermal stability have showed that Aucontent of these samples were 3.89% and 1.76, respectively. It was found that the amount of Au contentdecreased after thermal stability process. Fourier Transform Infrared (FT-IR) spectra showed no changesin framework structure of zeolite during thermal stabilization process of the catalyst.

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