Synthesis, activity and thermal stability of gold nanoparticle on modified NH[4]-Y type zeolite for cooxidation
Iranian Journal of Environmental Health Science and Engineering. 2007; 4 (4): 263-269
en Inglés
| IMEMR
| ID: emr-97327
ABSTRACT
Gold nanoparticle is the active catalyst for CO oxidation at low temperature. This feature of gold base catalysts is suitable to overcome the problem of cold-start problem of automobile exhaust TWC converters. In this study gold nanoparticle were deposited on modified NH[4]-Y type zeolite. The activity of synthesized catalyst was measured in a fixed-bed quartz-tubular reactor [7mm i.d.] under atmospheric pressure. In order to investigate the catalytic activities toward CO oxidation reaction, 31mL/min of air and 0.155mL/min of carbon monoxide were mixed and then passed through the reactor. It was found that activity of Au/Y catalyst was 100% at 20°C. The thermal stability of Au/Y catalyst was measured at 400°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 Au content of these samples were 3.89% and 1.76, respectively. It was found that the amount of Au content decreased after thermal stability process. Fourier Transform Infrared [FT-IR] spectra showed no changes in framework structure of zeolite during thermal stabilization process of the catalyst
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Índice:
IMEMR (Mediterraneo Oriental)
Asunto principal:
Oxidación-Reducción
/
Monóxido de Carbono
/
Zeolitas
/
Nanotecnología
/
Nanopartículas
/
Oro
Idioma:
Inglés
Revista:
Iran. J. Environ. Health Sci. Eng.
Año:
2007
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