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HYSYDAYS
1st World Congress of Young Scientists on Hydrogen Energy Systems

ISBN Imprimir: 1-56700-230-7

CHARACTERISATION OF A NEW GOLD CATALYST SUPPORTED ON MIXED OXIDES FOR PURE HYDROGEN PRODUCTION AND PURIFICATION

Resumo

A characterisation study of a new gold catalyst, supported on ceria-titania and prepared by a deposition-precipitation method, is presented. In order to discuss the catalytic data of water gas shift reaction (WGSR) activity and to get an interpretation of the positive effect of CeO2, TEM, UV-Vis and FTIR analysis have been undertaken. HRTEM has shown presence of very highly dispersed gold clusters with average size of 2 nm and presence of highly defective support phases. FTIR data of CO chemisorption have evidenced positive gold ions stabilized by the mixed oxide surface. The study of CO, O2 and H2 interaction by FTIR shows that the addition of ceria has a positive effect on the preferential oxidation of CO in the presence of an excess of hydrogen (PROX). UV-Vis spectra have shown a band-gap position at lower frequency than those of rutile and of anatase, suggesting a potential use of this catalyst as photoactive material, under visible light.
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