سال انتشار: ۱۳۸۷

محل انتشار: همایش بین المللی ژئولیت ایران

تعداد صفحات: ۱۰

نویسنده(ها):

Saeed jafari – Dept. of Occupational Health, Medical Faculty, Tarbiat Modares University, Tehran, Iran
hassan asilian – Dept. of Occupational Health, Medical Faculty, Tarbiat Modares University, Tehran, Iran
hossein kazemian – R&D Lab. Of SPAG Co., Technology incubator, Sci & Technol. Park of Tehran University, Tehran, Iran,

چکیده:

Nano-gold particles were deposited on Na-Y and H-Y zeolite modified from NH4-Y type zeolite using
chloroauric acid solution. The synthesized catalysts were characterized and then its activity was measured in
a fix bed quartz-tubular reactor (7mm i.d.) under atmospheric pressure. In order to investigate its catalytic
activities toward CO oxidation reaction, 31 ml/min of air and 0.155 ml/min of carbon monoxide were
mixed and then passed through the reactor. It was found that Au/Na-Y and Au/H-Y fresh catalysts at 20°C
have 100% and 5% CO conversion respectively. It was found that Au/Na-Y required an induction period in
order to reach a complete activity at 20°C. The stability of catalysts was measured at 400°C for 4h that
catalysts have complete conversion. The activity of the Au/Na-Y catalyst was decreased to 65% at 20°C and
the activity of the Au/H-Y was increase to 15% after thermal stability test. Results of Energy Dispersive
Analysis by X-rays (EDAX) before and after thermal stabilization of the Au/Na-Y catalyst were showed that
Au content of these samples were3.89% and 1.76 respectively. It was found that the amount of Au content
decrease after thermal stability process. Fourier Transform Infrared (FTIR) spectra were showed no changes
in framework structure of zeolite during thermal stabilization process of the catalyst.